CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
2082 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Differentiate between density and specific gravity.
Density is the mass per unit volume of a substance. It has a unit (kg/m³ or g/cm³). It is an absolute physical quantity. Specific gravity is the ratio of the density of a substance to the density of water at 4°C. It has no unit (dimensionless). It is a relative physical quantity.
Density is the mass per unit volume of a substance. It has a unit (kg/m³ or g/cm³). It is an absolute physical quantity. Specific gravity is the ratio of the density of a substance to the density of water at 4°C. It has no unit (dimensionless). It is a relative physical quantity.
2. ‘Hot soup is tastier than cold soup.’ Why?
Hot soup releases more aromatic compounds due to increased molecular motion, stimulating taste buds better. Heat enhances flavor molecule volatility and dissolves them more effectively, while warmth also psychologically improves taste perception.
Hot soup releases more aromatic compounds due to increased molecular motion, stimulating taste buds better. Heat enhances flavor molecule volatility and dissolves them more effectively, while warmth also psychologically improves taste perception.
3. ‘Dews are formed in early morning.’ Why?
Dew forms when surface temperature drops below dew point overnight, causing water vapor to condense on cool surfaces. Early morning has lowest temperatures after night cooling, with calm winds and clear skies promoting maximum condensation.
Dew forms when surface temperature drops below dew point overnight, causing water vapor to condense on cool surfaces. Early morning has lowest temperatures after night cooling, with calm winds and clear skies promoting maximum condensation.
4. What is the position of an image formed by a convex lens of focal length 18 cm when an object is placed 12 cm in the front of the lens? Click Now
Using lens formula 1/f = 1/v – 1/u with f=18cm, u=-12cm gives v=-36cm. The image is virtual, erect, magnified and located 36cm on same side as object since object is between focus and lens.
Using lens formula 1/f = 1/v – 1/u with f=18cm, u=-12cm gives v=-36cm. The image is virtual, erect, magnified and located 36cm on same side as object since object is between focus and lens.
5. Define beat and beat frequency. Click Now
A beat is the regular rise and fall in the loudness of sound when two sounds with nearly the same frequencies are heard together. It happens because the sound waves sometimes add and sometimes cancel each other. Beats are heard clearly only when the difference between the two frequencies is small. On the other hand, beat frequency is the number of beats heard in one second. It is equal to the difference between the frequencies of the two sounds. Beat frequency helps us to compare or find unknown sound frequencies.
A beat is the regular rise and fall in the loudness of sound when two sounds with nearly the same frequencies are heard together. It happens because the sound waves sometimes add and sometimes cancel each other. Beats are heard clearly only when the difference between the two frequencies is small. On the other hand, beat frequency is the number of beats heard in one second. It is equal to the difference between the frequencies of the two sounds. Beat frequency helps us to compare or find unknown sound frequencies.
6. ‘Sharp edges are avoided machines.’ Why?
Sharp edges concentrate stress leading to crack formation and material failure. In electrical machines, they cause electric field concentration increasing corona discharge risk. They also create safety hazards for operators.
Sharp edges concentrate stress leading to crack formation and material failure. In electrical machines, they cause electric field concentration increasing corona discharge risk. They also create safety hazards for operators.
7. ‘Two electric lines of force never intersect.’ Why?
Electric lines of force never intersect because at intersection point, there would be two tangent directions meaning two electric field directions, which is impossible since electric field has unique direction at any point.
Electric lines of force never intersect because at intersection point, there would be two tangent directions meaning two electric field directions, which is impossible since electric field has unique direction at any point.
8. What are the horizontal and vertical components of earth’s magnetic field? Write their formula.
Horizontal component BH = B cosθ, vertical component BV = B sinθ where B is total magnetic field and θ is angle of dip. BH helps compass navigation while BV causes dip needle inclination.
Horizontal component BH = B cosθ, vertical component BV = B sinθ where B is total magnetic field and θ is angle of dip. BH helps compass navigation while BV causes dip needle inclination.
9. What do you mean by neutral temperature and temperature of inversion?
Neutral temperature is thermocouple temperature where thermoelectric power is zero and emf maximum. Temperature of inversion is higher temperature where thermoelectric emf becomes zero again after reaching maximum at neutral temperature.
Neutral temperature is thermocouple temperature where thermoelectric power is zero and emf maximum. Temperature of inversion is higher temperature where thermoelectric emf becomes zero again after reaching maximum at neutral temperature.
10. State Faraday’s laws of electromagnetic induction.
First law: Whenever magnetic flux through circuit changes, induced emf is produced. Second law: Induced emf magnitude equals rate of change of magnetic flux linkage (ε = -dΦ/dt). Negative sign shows Lenz’s law.
First law: Whenever magnetic flux through circuit changes, induced emf is produced. Second law: Induced emf magnitude equals rate of change of magnetic flux linkage (ε = -dΦ/dt). Negative sign shows Lenz’s law.
11. Define binding energy and binding energy curve.
Binding energy is the energy required to completely separate all the nucleons (protons and neutrons) of a nucleus into free particles. It is a measure of the stability of the nucleus, and a higher binding energy means a more stable nucleus. The binding energy curve is a graph that shows the variation of binding energy per nucleon with the mass number of nuclei. This curve explains why medium-mass nuclei are most stable and helps in understanding nuclear reactions like fission and fusion.
Binding energy is the energy required to completely separate all the nucleons (protons and neutrons) of a nucleus into free particles. It is a measure of the stability of the nucleus, and a higher binding energy means a more stable nucleus. The binding energy curve is a graph that shows the variation of binding energy per nucleon with the mass number of nuclei. This curve explains why medium-mass nuclei are most stable and helps in understanding nuclear reactions like fission and fusion.
12. Can X-ray be used for the photoelectric effect? Explain.
Yes, X-rays can cause photoelectric effect as they are high frequency electromagnetic radiation with sufficient photon energy to eject electrons from metal surfaces, following Einstein’s photoelectric equation hν = φ + KEmax.
Yes, X-rays can cause photoelectric effect as they are high frequency electromagnetic radiation with sufficient photon energy to eject electrons from metal surfaces, following Einstein’s photoelectric equation hν = φ + KEmax.
2081 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Check the correctness of equation y² = u² + 2as. dimensionally.
Equation is dimensionally incorrect. LHS [y²]=[L²], RHS [u²]=[L²T⁻²] and [2as]=[L²T⁻²]. Since [L²]≠[L²T⁻²], dimensions don’t match. Correct equation is v²=u²+2as where v is final velocity.
Equation is dimensionally incorrect. LHS [y²]=[L²], RHS [u²]=[L²T⁻²] and [2as]=[L²T⁻²]. Since [L²]≠[L²T⁻²], dimensions don’t match. Correct equation is v²=u²+2as where v is final velocity.
2. The maximum height of projectile is equal to horizontal range. Find the angle of projectile.
Setting H=(u²sin²θ)/2g equal to R=(u²sin2θ)/g gives tanθ=4, so θ=tan⁻¹(4)≈76°. At this angle, trigonometric relationship makes vertical height equal horizontal range for same initial velocity.
Setting H=(u²sin²θ)/2g equal to R=(u²sin2θ)/g gives tanθ=4, so θ=tan⁻¹(4)≈76°. At this angle, trigonometric relationship makes vertical height equal horizontal range for same initial velocity.
3. Define thermal conductivity. Also write its unit.
Thermal conductivity is material’s ability to conduct heat, defined as heat transferred per unit time through unit area with unit temperature gradient. Its SI unit is watt per meter per kelvin (W/m·K).
Thermal conductivity is material’s ability to conduct heat, defined as heat transferred per unit time through unit area with unit temperature gradient. Its SI unit is watt per meter per kelvin (W/m·K).
4. Why hypermetropic eye is unable to see nearer objects? Write its way of remedy.
Hypermetropic eye has shorter eyeball or weaker lens causing image formation behind retina for near objects. Remedy is using convex lens spectacles which converge light rays before entering eye to focus on retina properly.
Hypermetropic eye has shorter eyeball or weaker lens causing image formation behind retina for near objects. Remedy is using convex lens spectacles which converge light rays before entering eye to focus on retina properly.
5. What do you mean by surface density of charge?
Surface charge density is charge per unit area on a surface (σ = Q/A). It measures how densely charge is distributed over surface, important in capacitor plates and conductors where charge resides on surfaces.
Surface charge density is charge per unit area on a surface (σ = Q/A). It measures how densely charge is distributed over surface, important in capacitor plates and conductors where charge resides on surfaces.
6. What is earth’s magnetism? What are its elements?
Earth’s magnetism is magnetic field surrounding Earth similar to bar magnet. Its elements are magnetic declination (angle between geographic and magnetic meridian), dip (inclination from horizontal), and horizontal component of magnetic field.
Earth’s magnetism is magnetic field surrounding Earth similar to bar magnet. Its elements are magnetic declination (angle between geographic and magnetic meridian), dip (inclination from horizontal), and horizontal component of magnetic field.
7. Differentiate between shunt and multiplier. Click Now
Shunt is low resistance connected parallel to galvanometer to convert it to ammeter for measuring current. Multiplier is high resistance connected series to galvanometer to convert it to voltmeter for measuring voltage.
Shunt is low resistance connected parallel to galvanometer to convert it to ammeter for measuring current. Multiplier is high resistance connected series to galvanometer to convert it to voltmeter for measuring voltage.
8. Explain the nature of path of electron inside the electric and magnetic field.
In electric field, electron follows parabolic path with acceleration parallel to field. In magnetic field, electron follows circular path perpendicular to field with centripetal force from magnetic Lorentz force, radius r=mv/qB.
In electric field, electron follows parabolic path with acceleration parallel to field. In magnetic field, electron follows circular path perpendicular to field with centripetal force from magnetic Lorentz force, radius r=mv/qB.
9. Convert 1 amu into MeV. Click Now
Using E=mc², 1 amu = 1.66×10⁻²⁷ kg gives E=1.492×10⁻¹⁰ J. Converting to MeV: 1 amu = 931.5 MeV approximately, representing energy equivalent of nuclear mass unit in particle physics.
Using E=mc², 1 amu = 1.66×10⁻²⁷ kg gives E=1.492×10⁻¹⁰ J. Converting to MeV: 1 amu = 931.5 MeV approximately, representing energy equivalent of nuclear mass unit in particle physics.
2080 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Find the dimensional formula for universal gravitational constant. Click Now
From F=Gm₁m₂/r², G=Fr²/m₁m₂ gives [G]=[MLT⁻²][L²]/[M²]=[M⁻¹L³T⁻²]. This shows gravitational constant has dimensions inverse of mass, cube of length, and inverse square of time.
From F=Gm₁m₂/r², G=Fr²/m₁m₂ gives [G]=[MLT⁻²][L²]/[M²]=[M⁻¹L³T⁻²]. This shows gravitational constant has dimensions inverse of mass, cube of length, and inverse square of time.
2. At what angle horizontal range and vertical height of projectile are equal? Click Now
Setting R=(u²sin2θ)/g equal to H=(u²sin²θ)/2g gives tanθ=4, so θ≈76°. At this angle, projectile’s horizontal distance traveled equals maximum vertical height achieved during motion.
Setting R=(u²sin2θ)/g equal to H=(u²sin²θ)/2g gives tanθ=4, so θ≈76°. At this angle, projectile’s horizontal distance traveled equals maximum vertical height achieved during motion.
3. ‘Cargo is placed at the bottom of the ship’ why?
Cargo at bottom lowers center of gravity increasing ship stability against rolling and capsizing. This creates righting moment and reduces pendulum effect while providing ballast for proper draft in water.
Cargo at bottom lowers center of gravity increasing ship stability against rolling and capsizing. This creates righting moment and reduces pendulum effect while providing ballast for proper draft in water.
4. ‘Water in the earthen pot is cold’ why?
Earthen pot has tiny pores allowing water seepage and evaporation. Evaporation absorbs latent heat from remaining water cooling it. Pores also provide insulation while clay’s low thermal conductivity minimizes heat entry.
Earthen pot has tiny pores allowing water seepage and evaporation. Evaporation absorbs latent heat from remaining water cooling it. Pores also provide insulation while clay’s low thermal conductivity minimizes heat entry.
5. What are the conclusion of Faraday’s ice pail experiment?
Experiment shows charge resides on conductor’s outer surface, internal cavity remains charge-free. It demonstrates electrostatic shielding and charge distribution principles important for Faraday cages and electromagnetic protection.
Experiment shows charge resides on conductor’s outer surface, internal cavity remains charge-free. It demonstrates electrostatic shielding and charge distribution principles important for Faraday cages and electromagnetic protection.
6. ‘Magnetic lines of force never intersect each other’ why?
Magnetic lines never intersect because at intersection point there would be two magnetic field directions, impossible since magnetic field has unique direction determined by tangent to field line at any point.
Magnetic lines never intersect because at intersection point there would be two magnetic field directions, impossible since magnetic field has unique direction determined by tangent to field line at any point.
7. Define capacitance of capacitor. Write its SI unit.
Capacitance is ability to store charge per unit potential difference, C=Q/V. SI unit is farad (F), where 1 farad = 1 coulomb/volt. Practical units are microfarad (μF) and picofarad (pF).
Capacitance is ability to store charge per unit potential difference, C=Q/V. SI unit is farad (F), where 1 farad = 1 coulomb/volt. Practical units are microfarad (μF) and picofarad (pF).
8. Which one is more dangerous? AC or DC?
AC is more dangerous as its alternating nature causes sustained muscle contraction preventing release. AC’s 50/60 Hz frequency matches body rhythms increasing fibrillation risk at lower currents than DC.
AC is more dangerous as its alternating nature causes sustained muscle contraction preventing release. AC’s 50/60 Hz frequency matches body rhythms increasing fibrillation risk at lower currents than DC.
9. X-ray production and photoelectric effect are reverse phenomena. Explain.
X-ray production converts kinetic energy of electrons into electromagnetic radiation when they strike metal target. Photoelectric effect converts electromagnetic radiation (photons) into kinetic energy of electrons ejected from metal surface.
X-ray production converts kinetic energy of electrons into electromagnetic radiation when they strike metal target. Photoelectric effect converts electromagnetic radiation (photons) into kinetic energy of electrons ejected from metal surface.
10. What are the causes of water pollution? Explain.
Water pollution causes include industrial waste discharge, agricultural runoff with pesticides/fertilizers, domestic sewage, oil spills, thermal pollution from power plants, and radioactive waste contamination affecting aquatic life.
Water pollution causes include industrial waste discharge, agricultural runoff with pesticides/fertilizers, domestic sewage, oil spills, thermal pollution from power plants, and radioactive waste contamination affecting aquatic life.
2079 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Obtain the unit and dimensional formula of coefficient of viscosity.
Unit: pascal-second (Pa·s) or N·s/m². Dimensional formula: [ML⁻¹T⁻¹] from F=ηA(dv/dx), showing dependence on mass and inverse relationships with length and time dimensions for fluid friction.
Unit: pascal-second (Pa·s) or N·s/m². Dimensional formula: [ML⁻¹T⁻¹] from F=ηA(dv/dx), showing dependence on mass and inverse relationships with length and time dimensions for fluid friction.
2. “Animals are curl in circle during winter.” Why?
When an animal curls into a circular shape, the surface area of its body exposed to cold air is reduced. Less exposed surface area means less heat loss to the surroundings. By tucking their legs and head close to the body, animals also protect vital organs and maintain a warmer body temperature. Therefore, animals curl in a circle during winter to reduce heat loss and stay warm.
When an animal curls into a circular shape, the surface area of its body exposed to cold air is reduced. Less exposed surface area means less heat loss to the surroundings. By tucking their legs and head close to the body, animals also protect vital organs and maintain a warmer body temperature. Therefore, animals curl in a circle during winter to reduce heat loss and stay warm.
3. What do you mean by visual angle and accommodation of the eye?
Visual angle is angle subtended by object at eye determining apparent size. Accommodation is eye’s ability to change focal length by adjusting lens curvature to focus objects at different distances using ciliary muscles.
Visual angle is angle subtended by object at eye determining apparent size. Accommodation is eye’s ability to change focal length by adjusting lens curvature to focus objects at different distances using ciliary muscles.
4. State principle of superposition of wave.
Superposition principle states when two or more waves overlap, resultant displacement equals vector sum of individual displacements at each point. Waves pass through each other unchanged, interfering to create new wave patterns.
Superposition principle states when two or more waves overlap, resultant displacement equals vector sum of individual displacements at each point. Waves pass through each other unchanged, interfering to create new wave patterns.
5. Why sharp points are strictly avoided in electrical machine?
Sharp points concentrate electric field increasing corona discharge and insulation breakdown risk. They also accumulate charge more easily leading to sparking and reduce mechanical strength at stress concentration points.
Sharp points concentrate electric field increasing corona discharge and insulation breakdown risk. They also accumulate charge more easily leading to sparking and reduce mechanical strength at stress concentration points.
6. Define neutral point and angle of dip.
Neutral point is where magnetic fields cancel giving zero resultant field. Angle of dip is vertical angle between Earth’s magnetic field and horizontal plane, ranging 0° at equator to 90° at magnetic poles.
Neutral point is where magnetic fields cancel giving zero resultant field. Angle of dip is vertical angle between Earth’s magnetic field and horizontal plane, ranging 0° at equator to 90° at magnetic poles.
7. Define mass defect and binding energy of nucleus.
Mass defect is difference between sum of nucleon masses and actual nuclear mass. Binding energy is energy equivalent of mass defect (E=Δmc²) representing energy needed to disassemble nucleus into nucleons.
Mass defect is difference between sum of nucleon masses and actual nuclear mass. Binding energy is energy equivalent of mass defect (E=Δmc²) representing energy needed to disassemble nucleus into nucleons.
8. What are the differences between the deflection of the electron due to electric and magnetic field?
Electric field deflects electron parallel to field direction with parabolic path. Magnetic field deflects electron perpendicular to both velocity and field with circular path. Electric deflection depends on charge while magnetic on charge and velocity.
Electric field deflects electron parallel to field direction with parabolic path. Magnetic field deflects electron perpendicular to both velocity and field with circular path. Electric deflection depends on charge while magnetic on charge and velocity.
2078 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Taking force, length and time to be fundamental quantities, find the dimensional formula for density. Click Now
With [F], [L], [T] fundamental, mass [M]=[FL⁻¹T²] from F=ma. Density ρ=mass/volume gives [ρ]=[FL⁻¹T²][L⁻³]=[FL⁻⁴T²], showing density depends directly on force and time squared while inversely on length to fourth power.
With [F], [L], [T] fundamental, mass [M]=[FL⁻¹T²] from F=ma. Density ρ=mass/volume gives [ρ]=[FL⁻¹T²][L⁻³]=[FL⁻⁴T²], showing density depends directly on force and time squared while inversely on length to fourth power.
2. Why the base of ship is made heavier?
Heavy base lowers center of gravity increasing stability against rolling and capsizing. It provides ballast for proper buoyancy and draft while creating righting moment to return ship upright when tilted by waves.
Heavy base lowers center of gravity increasing stability against rolling and capsizing. It provides ballast for proper buoyancy and draft while creating righting moment to return ship upright when tilted by waves.
3. At what temperature will the Kelvin scale read double the Fahrenheit scale? Click Now
Solving K=2F with conversion K=(F-32)×5/9+273 gives F≈574.67 and K≈1149.34. At 1149.34 K, Kelvin reading doubles Fahrenheit value due to different zero points and scaling between temperature scales.
Solving K=2F with conversion K=(F-32)×5/9+273 gives F≈574.67 and K≈1149.34. At 1149.34 K, Kelvin reading doubles Fahrenheit value due to different zero points and scaling between temperature scales.
4. Why are dews formed in the clear night but not in the cloudy night?
Clear nights allow radiative cooling lowering surface temperature below dew point. Cloudy nights trap infrared radiation preventing sufficient cooling for condensation, while clouds also reflect heat back to surface.
Clear nights allow radiative cooling lowering surface temperature below dew point. Cloudy nights trap infrared radiation preventing sufficient cooling for condensation, while clouds also reflect heat back to surface.
5. Does the power of lens change when it is immersed in water? Explain.
Yes, lens power decreases in water because refractive index difference between lens material and water is less than between lens and air. Reduced refractive index difference decreases bending ability, lowering power P=1/f.
Yes, lens power decreases in water because refractive index difference between lens material and water is less than between lens and air. Reduced refractive index difference decreases bending ability, lowering power P=1/f.
6. A voltmeter is connected in parallel in electric circuit. Why?
Voltmeter measures potential difference between two points, requiring parallel connection to experience same voltage as circuit component. High resistance ensures minimal current draw preventing circuit disturbance during measurement.
Voltmeter measures potential difference between two points, requiring parallel connection to experience same voltage as circuit component. High resistance ensures minimal current draw preventing circuit disturbance during measurement.
7. What is significance of binding energy per nucleon?
Binding energy per nucleon indicates nuclear stability, with higher values meaning more stable nuclei. It peaks at iron-56, explaining why fusion releases energy for lighter elements and fission for heavier elements.
Binding energy per nucleon indicates nuclear stability, with higher values meaning more stable nuclei. It peaks at iron-56, explaining why fusion releases energy for lighter elements and fission for heavier elements.
8. How ozone layer is depleted? Show with chemical reaction.
CFCs release chlorine atoms destroying ozone: Cl + O₃ → ClO + O₂, ClO + O → Cl + O₂. Chlorine acts as catalyst, each atom destroying thousands of ozone molecules, creating ozone holes over polar regions.
CFCs release chlorine atoms destroying ozone: Cl + O₃ → ClO + O₂, ClO + O → Cl + O₂. Chlorine acts as catalyst, each atom destroying thousands of ozone molecules, creating ozone holes over polar regions.
2077 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Obtain the dimensional formula of universal gravitational constant. Click Now
From F=Gm₁m₂/r², G=Fr²/m₁m₂ gives [G]=[MLT⁻²][L²]/[M²]=[M⁻¹L³T⁻²]. This dimensional formula appears in gravitational equations from Newton’s law to Einstein’s general relativity formulations.
From F=Gm₁m₂/r², G=Fr²/m₁m₂ gives [G]=[MLT⁻²][L²]/[M²]=[M⁻¹L³T⁻²]. This dimensional formula appears in gravitational equations from Newton’s law to Einstein’s general relativity formulations.
2. Obtain the dimensional formula of specific heat capacity.
Specific heat s=Q/(mΔT) gives [s]=[ML²T⁻²]/[M][θ]=[L²T⁻²θ⁻¹]. It shows energy required to raise temperature depends on square of length and inverse square of time with inverse temperature dimension.
Specific heat s=Q/(mΔT) gives [s]=[ML²T⁻²]/[M][θ]=[L²T⁻²θ⁻¹]. It shows energy required to raise temperature depends on square of length and inverse square of time with inverse temperature dimension.
3. How does a shot put player project a ball so that he could get a maximum range?
Player projects at 45° for maximum range in vacuum, but around 42° considering air resistance. They also apply force at optimal release height and use spinning technique for gyroscopic stability during flight.
Player projects at 45° for maximum range in vacuum, but around 42° considering air resistance. They also apply force at optimal release height and use spinning technique for gyroscopic stability during flight.
4. Differentiate between elastic and inelastic collisions. Click Now
In an elastic collision, both momentum and kinetic energy are conserved. After the collision, the objects separate and no energy is lost in the form of heat, sound, or deformation. The bodies regain their original shape after collision. Such collisions are ideal and are mostly observed in microscopic particles like gas molecules. In an inelastic collision, only momentum is conserved but kinetic energy is not conserved. Some part of kinetic energy is converted into heat, sound, or energy of deformation. The bodies may not regain their original shape, and in some cases (perfectly inelastic collision), the bodies stick together after collision. These collisions are common in daily life, such as a clay ball hitting the ground.
In an elastic collision, both momentum and kinetic energy are conserved. After the collision, the objects separate and no energy is lost in the form of heat, sound, or deformation. The bodies regain their original shape after collision. Such collisions are ideal and are mostly observed in microscopic particles like gas molecules. In an inelastic collision, only momentum is conserved but kinetic energy is not conserved. Some part of kinetic energy is converted into heat, sound, or energy of deformation. The bodies may not regain their original shape, and in some cases (perfectly inelastic collision), the bodies stick together after collision. These collisions are common in daily life, such as a clay ball hitting the ground.
5. Define principal focus and focal length in a lens.
Principal focus is point where parallel light rays converge (convex) or appear to diverge (concave) after refraction. Focal length is distance between optical center and principal focus determining lens power P=1/f.
Principal focus is point where parallel light rays converge (convex) or appear to diverge (concave) after refraction. Focal length is distance between optical center and principal focus determining lens power P=1/f.
6. Sky appears blue in colour. Justify it.
The sky appears blue in colour due to scattering of sunlight by air molecules present in the atmosphere. Sunlight consists of different colours, but the shorter wavelength colours like blue and violet are scattered more than the longer wavelength colours such as red. Although violet is scattered more, the human eye is more sensitive to blue light and a part of violet light is absorbed in the upper atmosphere. As a result, scattered blue light reaches our eyes from all directions, making the sky appear blue.
The sky appears blue in colour due to scattering of sunlight by air molecules present in the atmosphere. Sunlight consists of different colours, but the shorter wavelength colours like blue and violet are scattered more than the longer wavelength colours such as red. Although violet is scattered more, the human eye is more sensitive to blue light and a part of violet light is absorbed in the upper atmosphere. As a result, scattered blue light reaches our eyes from all directions, making the sky appear blue.
7. Why can you get severe burn from steam at 100°C than from water at 100°C?
Steam at 100°C contains additional latent heat of vaporization (2260 kJ/kg) released during condensation on skin. This extra energy transfer causes more severe burns than water at same temperature without phase change.
Steam at 100°C contains additional latent heat of vaporization (2260 kJ/kg) released during condensation on skin. This extra energy transfer causes more severe burns than water at same temperature without phase change.
8. What do you mean by neutral temperature and temperature of inversion?
Neutral temperature is the temperature at which a thermocouple produces maximum thermo-emf. At this temperature, the rate of increase of thermo-emf with temperature difference becomes zero, so the thermo-emf is greatest for a given cold junction temperature. Temperature of inversion is the temperature at which the thermo-emf becomes zero and changes its direction. Beyond this temperature, the polarity of the thermo-emf reverses. It is always higher than the neutral temperature for a given thermocouple.
Neutral temperature is the temperature at which a thermocouple produces maximum thermo-emf. At this temperature, the rate of increase of thermo-emf with temperature difference becomes zero, so the thermo-emf is greatest for a given cold junction temperature. Temperature of inversion is the temperature at which the thermo-emf becomes zero and changes its direction. Beyond this temperature, the polarity of the thermo-emf reverses. It is always higher than the neutral temperature for a given thermocouple.
2076 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Can a physical quantity have unit but is dimensionless? (VVI)
Yes, dimensionless quantities can have units like angle (radians/degrees), refractive index, relative density, strain, and Mach number. These represent ratios of similar dimensional quantities canceling dimensions while keeping measurement units.
Yes, dimensionless quantities can have units like angle (radians/degrees), refractive index, relative density, strain, and Mach number. These represent ratios of similar dimensional quantities canceling dimensions while keeping measurement units.
2. Differentiate between the density and the specific gravity.
Density is defined as the mass of a substance per unit volume. It tells us how much matter is packed in a given space and its SI unit is kg m⁻³. The density of a substance depends on temperature and pressure and is different for different materials. Specific gravity is the ratio of the density of a substance to the density of water at 4°C. It compares how heavy a substance is relative to water and has **no unit** because it is a ratio of two densities. It does not depend on the system of units used and is mainly used to compare substances rather than measure absolute density.
Density is defined as the mass of a substance per unit volume. It tells us how much matter is packed in a given space and its SI unit is kg m⁻³. The density of a substance depends on temperature and pressure and is different for different materials. Specific gravity is the ratio of the density of a substance to the density of water at 4°C. It compares how heavy a substance is relative to water and has **no unit** because it is a ratio of two densities. It does not depend on the system of units used and is mainly used to compare substances rather than measure absolute density.
3. Define thermal conductivity and write its unit.
Thermal conductivity is heat transfer rate through material with unit temperature gradient across unit area. SI unit is W/m·K indicating watts transferred per meter thickness per kelvin temperature difference.
Thermal conductivity is heat transfer rate through material with unit temperature gradient across unit area. SI unit is W/m·K indicating watts transferred per meter thickness per kelvin temperature difference.
4. Define critical angle and total internal reflection.
Critical angle is minimum incidence angle in denser medium for 90° refraction into rarer medium. Total internal reflection occurs at greater angles causing complete reflection back into denser medium without refraction loss.
Critical angle is minimum incidence angle in denser medium for 90° refraction into rarer medium. Total internal reflection occurs at greater angles causing complete reflection back into denser medium without refraction loss.
5. What is stationary wave?
Stationary wave forms when two identical waves travel opposite directions superimposing. It has nodes (zero displacement) and antinodes (maximum displacement) fixed in space, with energy vibrating but not propagating through medium.
Stationary wave forms when two identical waves travel opposite directions superimposing. It has nodes (zero displacement) and antinodes (maximum displacement) fixed in space, with energy vibrating but not propagating through medium.
6. What happens when capacitors are grouped in series?
Series grouping increases equivalent capacitance’s reciprocal: 1/Ceq=1/C₁+1/C₂+… Charge remains same across all capacitors while voltage divides inversely with capacitance values in the series combination.
Series grouping increases equivalent capacitance’s reciprocal: 1/Ceq=1/C₁+1/C₂+… Charge remains same across all capacitors while voltage divides inversely with capacitance values in the series combination.
7. What do you mean by joule conversion factor?
Joule conversion factor (J) relates mechanical work to heat energy: W=JH where J=4.186 J/cal. It establishes mechanical equivalent of heat showing work needed to produce unit heat, fundamental in thermodynamics.
Joule conversion factor (J) relates mechanical work to heat energy: W=JH where J=4.186 J/cal. It establishes mechanical equivalent of heat showing work needed to produce unit heat, fundamental in thermodynamics.
8. Write the medical uses of radiation.
Radiation medically treats cancers (radiotherapy), sterilizes equipment, diagnoses through X-rays/CT scans, uses radioisotopes as tracers, and performs nuclear medicine imaging like PET scans for disease detection.
Radiation medically treats cancers (radiotherapy), sterilizes equipment, diagnoses through X-rays/CT scans, uses radioisotopes as tracers, and performs nuclear medicine imaging like PET scans for disease detection.
9. Define specific charge of an electron. Write its value.
Specific charge is charge-to-mass ratio (e/m) of electron. Value is 1.76×10¹¹ C/kg determined by J.J. Thomson, important in cathode ray tubes, mass spectrometers, and fundamental particle physics research.
Specific charge is charge-to-mass ratio (e/m) of electron. Value is 1.76×10¹¹ C/kg determined by J.J. Thomson, important in cathode ray tubes, mass spectrometers, and fundamental particle physics research.
2075 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Name any two physical quantities which have same dimension. Can a quantity have unit but no dimension? Explain. (VVI)
Work and torque both have [ML²T⁻²]. Yes, dimensionless quantities with units exist: angle (radians), refractive index, relative density, strain. These are ratios canceling dimensions while retaining units for measurement.
Work and torque both have [ML²T⁻²]. Yes, dimensionless quantities with units exist: angle (radians), refractive index, relative density, strain. These are ratios canceling dimensions while retaining units for measurement.
2. Which one is more elastic, steel or rubber. Explain. (VVI)
Steel has a much higher Young’s modulus than rubber, which means steel undergoes very little deformation for the same applied force and returns quickly to its original shape. Rubber, although it can be stretched easily, has a low Young’s modulus and undergoes large deformation. Therefore, steel is more elastic than rubber, even though rubber appears more stretchable.
Steel has a much higher Young’s modulus than rubber, which means steel undergoes very little deformation for the same applied force and returns quickly to its original shape. Rubber, although it can be stretched easily, has a low Young’s modulus and undergoes large deformation. Therefore, steel is more elastic than rubber, even though rubber appears more stretchable.
3. Does the focal length of lens change when immersed into water? Will it increase or decrease.
Yes, focal length increases in water because refractive index difference between lens material and water is less than between lens and air. Reduced bending ability decreases power (P=1/f), increasing focal length for both convex and concave lenses.
Yes, focal length increases in water because refractive index difference between lens material and water is less than between lens and air. Reduced bending ability decreases power (P=1/f), increasing focal length for both convex and concave lenses.
4. Why does light disperse into seven different colours?
Dispersion occurs because refractive index varies with wavelength (Cauchy’s law). Shorter violet wavelengths bend more than longer red wavelengths when passing through prism, separating white light into visible spectrum colors.
Dispersion occurs because refractive index varies with wavelength (Cauchy’s law). Shorter violet wavelengths bend more than longer red wavelengths when passing through prism, separating white light into visible spectrum colors.
5. Define mass defect and binding energy of nucleus. (VVI)
Mass defect is the difference between the sum of the masses of the individual nucleons (protons and neutrons) and the actual mass of the nucleus. This missing mass occurs because a part of the mass is converted into energy when nucleons bind together to form the nucleus. Binding energy of a nucleus is the amount of energy released when the nucleus is formed from its nucleons, or equivalently, the energy required to completely separate the nucleus into its individual protons and neutrons. It is a measure of the stability of the nucleus and is directly related to the mass defect by Einstein’s mass–energy relation.
Mass defect is the difference between the sum of the masses of the individual nucleons (protons and neutrons) and the actual mass of the nucleus. This missing mass occurs because a part of the mass is converted into energy when nucleons bind together to form the nucleus. Binding energy of a nucleus is the amount of energy released when the nucleus is formed from its nucleons, or equivalently, the energy required to completely separate the nucleus into its individual protons and neutrons. It is a measure of the stability of the nucleus and is directly related to the mass defect by Einstein’s mass–energy relation.
2074 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Find the unit and dimensional formula of universal gravitational constant.
Unit: N·m²/kg². Dimensional formula: [M⁻¹L³T⁻²] from F=Gm₁m₂/r². This constant appears in Newton’s law of gravitation and has value 6.67×10⁻¹¹ N·m²/kg² for universal gravitational calculations.
Unit: N·m²/kg². Dimensional formula: [M⁻¹L³T⁻²] from F=Gm₁m₂/r². This constant appears in Newton’s law of gravitation and has value 6.67×10⁻¹¹ N·m²/kg² for universal gravitational calculations.
2. For driving a car, what types of mirror would you prefer and why?
For driving a car, a convex mirror is preferred as the rear-view mirror. This is because a convex mirror always forms erect and diminished images and provides a wider field of view. Due to the wider field of view, the driver can see a larger area behind the car, which helps in observing traffic and vehicles approaching from the rear. This makes driving safer and more convenient.
For driving a car, a convex mirror is preferred as the rear-view mirror. This is because a convex mirror always forms erect and diminished images and provides a wider field of view. Due to the wider field of view, the driver can see a larger area behind the car, which helps in observing traffic and vehicles approaching from the rear. This makes driving safer and more convenient.
3. Define angle of repose.
Angle of repose is maximum slope angle where material remains stable without sliding. Equal to angle of friction, it represents balance between gravitational component down slope and frictional force resisting motion.
Angle of repose is maximum slope angle where material remains stable without sliding. Equal to angle of friction, it represents balance between gravitational component down slope and frictional force resisting motion.
4. A compass needle shows any direction at the natural point. Why?
At neutral point, Earth’s magnetic field cancels with other fields producing zero resultant. With no net magnetic field, compass needle experiences no torque and can point in any direction freely without alignment force.
At neutral point, Earth’s magnetic field cancels with other fields producing zero resultant. With no net magnetic field, compass needle experiences no torque and can point in any direction freely without alignment force.
5. What do you mean by the half life of a radioactive substance? (VVI)
Half-life is time for half of radioactive atoms to decay, constant for each isotope. It characterizes exponential decay rate independent of amount, used in radiometric dating, medical treatments, and nuclear safety calculations.
Half-life is time for half of radioactive atoms to decay, constant for each isotope. It characterizes exponential decay rate independent of amount, used in radiometric dating, medical treatments, and nuclear safety calculations.
6. What is air pollution? What are its effect on human being?
Air pollution is the condition in which harmful substances such as smoke, dust, poisonous gases, and microorganisms are present in the air in excessive amounts, making the air unsafe for living beings. Effects of air pollution on human beings include various health problems. It can cause irritation of the eyes, nose, and throat, and lead to respiratory diseases such as asthma, bronchitis, and lung infections. Long-term exposure to polluted air may result in heart diseases, reduced lung capacity, and even lung cancer. Air pollution also weakens the immune system and can cause headaches, fatigue, and reduced life expectancy.
Air pollution is the condition in which harmful substances such as smoke, dust, poisonous gases, and microorganisms are present in the air in excessive amounts, making the air unsafe for living beings. Effects of air pollution on human beings include various health problems. It can cause irritation of the eyes, nose, and throat, and lead to respiratory diseases such as asthma, bronchitis, and lung infections. Long-term exposure to polluted air may result in heart diseases, reduced lung capacity, and even lung cancer. Air pollution also weakens the immune system and can cause headaches, fatigue, and reduced life expectancy.
7. What are cathode rays? Does it deflect by magnetic field?
Cathode rays are electron streams from cathode in discharge tube. Yes, they deflect in magnetic field perpendicular to motion following F=qv×B, with circular path demonstrating negative charge and particle nature.
Cathode rays are electron streams from cathode in discharge tube. Yes, they deflect in magnetic field perpendicular to motion following F=qv×B, with circular path demonstrating negative charge and particle nature.
2073 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. A student writes time period of simple pendulum as \( T = 2\pi \sqrt{\frac{l}{g}} \), is he correct? Check by dimensional method. (VVI)
Yes, dimensionally correct. LHS [T]=[T]. RHS: [2π]=dimensionless, [√(l/g)]=[√(L/LT⁻²)]=[√(T²)]=[T]. Both sides have [T], satisfying dimensional homogeneity for simple pendulum approximation with small oscillations.
Yes, dimensionally correct. LHS [T]=[T]. RHS: [2π]=dimensionless, [√(l/g)]=[√(L/LT⁻²)]=[√(T²)]=[T]. Both sides have [T], satisfying dimensional homogeneity for simple pendulum approximation with small oscillations.
2. It is easier to pull than to push, how?
Pulling has upward component reducing normal reaction and friction (F=μN). Pushing has downward component increasing normal reaction and friction. Reduced friction makes pulling easier for moving objects on surfaces.
Pulling has upward component reducing normal reaction and friction (F=μN). Pushing has downward component increasing normal reaction and friction. Reduced friction makes pulling easier for moving objects on surfaces.
3. What is regulation?
Regelation is ice melting under pressure and refreezing when pressure removed. Demonstrated by wire passing through ice block without cutting it, important in glacier movement and ice skate functioning principles.
Regelation is ice melting under pressure and refreezing when pressure removed. Demonstrated by wire passing through ice block without cutting it, important in glacier movement and ice skate functioning principles.
4. Why does diamond sparkle?
Diamond sparkles due to high refractive index (2.42) and small critical angle (~24°). This causes total internal reflection with light undergoing multiple reflections before emerging, combined with dispersion creating colorful sparkles.
Diamond sparkles due to high refractive index (2.42) and small critical angle (~24°). This causes total internal reflection with light undergoing multiple reflections before emerging, combined with dispersion creating colorful sparkles.
5. How the speed of sound in gaseous medium change with temperature?
Speed increases with temperature as v∝√T (Kelvin). For air, v=331√(1+T/273) m/s where T in °C. Higher temperature increases molecular speed and pressure restoring forces, enhancing sound wave propagation speed.
Speed increases with temperature as v∝√T (Kelvin). For air, v=331√(1+T/273) m/s where T in °C. Higher temperature increases molecular speed and pressure restoring forces, enhancing sound wave propagation speed.
6. A conductor is stretched to double of its length, what happens to the resistance and resistivity?
Resistance increases four times (R∝L² since volume constant). Resistivity remains unchanged as it’s material property independent of dimensions. New resistance R’=4R while resistivity ρ stays same for material.
Resistance increases four times (R∝L² since volume constant). Resistivity remains unchanged as it’s material property independent of dimensions. New resistance R’=4R while resistivity ρ stays same for material.
7. An electron moves in a straight path in any certain region, are you sure that it is free from any field?
No, straight path only means zero net force, not necessarily zero field. Electron could have parallel velocity to electric field or perpendicular to both electric and magnetic fields with balanced forces giving straight motion.
No, straight path only means zero net force, not necessarily zero field. Electron could have parallel velocity to electric field or perpendicular to both electric and magnetic fields with balanced forces giving straight motion.
8. What are the properties of electromagnetic waves?
EM waves transverse, travel light speed in vacuum, need no medium, obey wave equation, carry energy/momentum, show reflection/refraction/diffraction/interference/polarization, and have E⊥B⊥propagation direction relationships.
EM waves transverse, travel light speed in vacuum, need no medium, obey wave equation, carry energy/momentum, show reflection/refraction/diffraction/interference/polarization, and have E⊥B⊥propagation direction relationships.
9. Photo panels are made of alkali metals, why?
Alkali metals have low work functions requiring less photon energy for electron emission. Their electronic configuration allows easy electron release under visible light, making them efficient photoelectric materials for solar panels.
Alkali metals have low work functions requiring less photon energy for electron emission. Their electronic configuration allows easy electron release under visible light, making them efficient photoelectric materials for solar panels.
2072 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.
Yes, motion is relative. Example: Passenger in moving train is at rest relative to train but moving relative to ground. Similarly, books on car seat are stationary relative to car but moving relative to trees outside.
Yes, motion is relative. Example: Passenger in moving train is at rest relative to train but moving relative to ground. Similarly, books on car seat are stationary relative to car but moving relative to trees outside.
2. Hot soup is tastier than cold soup; why?
Heat increases molecular motion releasing more aromatic compounds stimulating smell/taste receptors. Warmth enhances flavor molecule volatility and dissolution while providing comforting sensation improving perceived taste experience.
Heat increases molecular motion releasing more aromatic compounds stimulating smell/taste receptors. Warmth enhances flavor molecule volatility and dissolution while providing comforting sensation improving perceived taste experience.
3. Why does a clear pool of water always appear to be shallower than it actually is?
Refraction bends light rays away from normal when exiting water to air. This makes objects appear higher than actual position, causing apparent depth ≈ real depth/refractive index, making pool seem shallower.
Refraction bends light rays away from normal when exiting water to air. This makes objects appear higher than actual position, causing apparent depth ≈ real depth/refractive index, making pool seem shallower.
4. Define one electron volt (1 eV).
1 eV is kinetic energy gained by electron accelerated through 1 volt potential difference. 1 eV = 1.602×10⁻¹⁹ J, used as convenient energy unit in atomic, nuclear, and particle physics calculations.
1 eV is kinetic energy gained by electron accelerated through 1 volt potential difference. 1 eV = 1.602×10⁻¹⁹ J, used as convenient energy unit in atomic, nuclear, and particle physics calculations.
5. Define Emf and Terminal potential difference. Click Now
Electromotive force (EMF) of a source is defined as the total energy supplied by the source per unit charge to drive the electric current through a complete circuit. It represents the maximum potential difference the source can provide when no current is drawn (i.e., in an open circuit). Its SI unit is volt (V). Terminal potential difference (TPD)is the actual potential difference across the terminals of a source when a current is flowing through the circuit. Due to the internal resistance of the source, the terminal potential difference is always less than the EMF when the source delivers current. In simple terms: EMF = maximum voltage, TPD = working voltage under load.
Electromotive force (EMF) of a source is defined as the total energy supplied by the source per unit charge to drive the electric current through a complete circuit. It represents the maximum potential difference the source can provide when no current is drawn (i.e., in an open circuit). Its SI unit is volt (V). Terminal potential difference (TPD)is the actual potential difference across the terminals of a source when a current is flowing through the circuit. Due to the internal resistance of the source, the terminal potential difference is always less than the EMF when the source delivers current. In simple terms: EMF = maximum voltage, TPD = working voltage under load.
6. Define electric potential and equipotential surface.
Electric potential at a point is defined as the amount of work done to bring a unit positive charge from infinity to that point in an electric field without acceleration. Its SI unit is volt (V). It represents the potential energy per unit charge at that point. An equipotential surface is a surface on which the electric potential is the same at every point. On such a surface, no work is done in moving a charge from one point to another, because there is no change in potential. Equipotential surfaces are always perpendicular to electric field lines.
Electric potential at a point is defined as the amount of work done to bring a unit positive charge from infinity to that point in an electric field without acceleration. Its SI unit is volt (V). It represents the potential energy per unit charge at that point. An equipotential surface is a surface on which the electric potential is the same at every point. On such a surface, no work is done in moving a charge from one point to another, because there is no change in potential. Equipotential surfaces are always perpendicular to electric field lines.
2071 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Find the dimensional formula of surface tension and coefficient of viscosity.
Surface tension [γ]=[MT⁻²] from force per length. Coefficient of viscosity [η]=[ML⁻¹T⁻¹] from F=ηA(dv/dx). These represent fluid surface energy and internal friction respectively with different dimensional characteristics.
Surface tension [γ]=[MT⁻²] from force per length. Coefficient of viscosity [η]=[ML⁻¹T⁻¹] from F=ηA(dv/dx). These represent fluid surface energy and internal friction respectively with different dimensional characteristics.
2. State the Faraday’s law of electromagnetic induction.
First law: Changing magnetic flux induces emf. Second law: Induced emf magnitude equals flux change rate (ε=-dΦ/dt). Negative sign shows Lenz’s law direction where induced current opposes flux change causing it.
First law: Changing magnetic flux induces emf. Second law: Induced emf magnitude equals flux change rate (ε=-dΦ/dt). Negative sign shows Lenz’s law direction where induced current opposes flux change causing it.
3. Action and reaction are always equal but opposite to each other, then why not they cancel each other?
Action-reaction act on different bodies (Newton’s third law). Since they don’t act on same object, they don’t cancel. Example: Hand pushes wall (action on wall), wall pushes hand back (reaction on hand), affecting different objects.
Action-reaction act on different bodies (Newton’s third law). Since they don’t act on same object, they don’t cancel. Example: Hand pushes wall (action on wall), wall pushes hand back (reaction on hand), affecting different objects.
4. What do you mean by binding energy?
Binding energy is energy required to disassemble system into separate components. Nuclear binding energy is energy needed to separate nucleons, equal to mass defect converted via E=Δmc², indicating nuclear stability levels.
Binding energy is energy required to disassemble system into separate components. Nuclear binding energy is energy needed to separate nucleons, equal to mass defect converted via E=Δmc², indicating nuclear stability levels.
5. Discuss the use of x-rays in medicine?
X-rays diagnose fractures (radiography), detect tumors, perform CT scans for cross-sectional views, treat cancers (radiotherapy), and guide surgical procedures. They visualize internal structures non-invasively for medical diagnosis.
X-rays diagnose fractures (radiography), detect tumors, perform CT scans for cross-sectional views, treat cancers (radiotherapy), and guide surgical procedures. They visualize internal structures non-invasively for medical diagnosis.
6. Explain green house effect.
Greenhouse effect traps Earth’s infrared radiation by atmospheric gases (CO₂, methane, water vapor). These gases allow sunlight in but absorb outgoing heat radiation, warming planet naturally but enhanced by human activities causing global warming.
Greenhouse effect traps Earth’s infrared radiation by atmospheric gases (CO₂, methane, water vapor). These gases allow sunlight in but absorb outgoing heat radiation, warming planet naturally but enhanced by human activities causing global warming.
2070 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. What do you mean by specific gravity? Write down its unit.
Specific gravity is density ratio of substance to water at 4°C. Being dimensionless ratio, it has no units. It indicates whether material floats (SG<1) or sinks (SG>1) in water for material comparison purposes.
Specific gravity is density ratio of substance to water at 4°C. Being dimensionless ratio, it has no units. It indicates whether material floats (SG<1) or sinks (SG>1) in water for material comparison purposes.
2. Write the properties of magnetic lines of force.
Magnetic lines never intersect, form closed loops from N to S externally, density indicates field strength, tangent gives direction, they repel laterally, and cannot cross regions with infinite permeability following field properties.
Magnetic lines never intersect, form closed loops from N to S externally, density indicates field strength, tangent gives direction, they repel laterally, and cannot cross regions with infinite permeability following field properties.
3. How do you know your friends, while you receive his/her phone call?
Voice recognition through unique vocal characteristics (pitch, tone, timbre) processed by auditory cortex. Brain matches patterns from memory while contextual cues and conversation content further confirm identity during phone communication.
Voice recognition through unique vocal characteristics (pitch, tone, timbre) processed by auditory cortex. Brain matches patterns from memory while contextual cues and conversation content further confirm identity during phone communication.
4. What is internal resistance? Write the relation between E, V and r.
Internal resistance (r) is opposition to current within source itself. Relation: V = ε – Ir where ε=emf, V=terminal voltage, I=current, r=internal resistance. Voltage drop Ir occurs inside source during current flow.
Internal resistance (r) is opposition to current within source itself. Relation: V = ε – Ir where ε=emf, V=terminal voltage, I=current, r=internal resistance. Voltage drop Ir occurs inside source during current flow.
5. Differentiate between A.C. and D.C. Click Now
AC Alternating current (A.C.) and direct current (D.C.) are two types of electric current that differ in flow and behavior. A.C. reverses its direction periodically and its magnitude varies with time, usually following a sine wave pattern. It is commonly produced by generators and supplied through mains electricity, making it ideal for power distribution over long distances and household use. On the other hand, D.C. flows in one direction only and its magnitude remains constant with time, which makes it suitable for batteries, electronic gadgets, and small appliances. Thus, A.C. provides a varying, bidirectional flow of charge, while D.C. provides a steady, unidirectional flow.
AC Alternating current (A.C.) and direct current (D.C.) are two types of electric current that differ in flow and behavior. A.C. reverses its direction periodically and its magnitude varies with time, usually following a sine wave pattern. It is commonly produced by generators and supplied through mains electricity, making it ideal for power distribution over long distances and household use. On the other hand, D.C. flows in one direction only and its magnitude remains constant with time, which makes it suitable for batteries, electronic gadgets, and small appliances. Thus, A.C. provides a varying, bidirectional flow of charge, while D.C. provides a steady, unidirectional flow.
2069 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Write the unit and dimension of Young’s modulus of elasticity.
Unit: pascal (Pa) or N/m². Dimension: [ML⁻¹T⁻²] from stress/strain where stress=[ML⁻¹T⁻²], strain dimensionless. Young’s modulus measures material stiffness under tensile/compressive deformation in elastic region.
Unit: pascal (Pa) or N/m². Dimension: [ML⁻¹T⁻²] from stress/strain where stress=[ML⁻¹T⁻²], strain dimensionless. Young’s modulus measures material stiffness under tensile/compressive deformation in elastic region.
2. When a body is thrown vertically upwards, what will be the velocity and acceleration at the maximum height?
At maximum height, velocity becomes zero momentarily before descending. Acceleration remains g=9.8 m/s² downward throughout motion, including at top point, causing deceleration during ascent and acceleration during descent.
At maximum height, velocity becomes zero momentarily before descending. Acceleration remains g=9.8 m/s² downward throughout motion, including at top point, causing deceleration during ascent and acceleration during descent.
3. Why dews are formed early in the morning?
Early morning has lowest temperatures after overnight radiative cooling. When surface temperature drops below dew point of surrounding air, water vapor condenses on cool surfaces like grass, forming dew droplets before sunrise.
Early morning has lowest temperatures after overnight radiative cooling. When surface temperature drops below dew point of surrounding air, water vapor condenses on cool surfaces like grass, forming dew droplets before sunrise.
4. Which type of mirror is suited in vehicles and why?
Convex mirrors suited for vehicles providing wider field of view. Although images are smaller/virtual, this shows more area behind/side for safer lane changes and reversing compared to plane mirrors’ limited view.
Convex mirrors suited for vehicles providing wider field of view. Although images are smaller/virtual, this shows more area behind/side for safer lane changes and reversing compared to plane mirrors’ limited view.
5. Thomson’s effect is the combined effect of Seebeck and Peltier effect, why?
Thomson effect involves heat absorption/emission when current flows through temperature gradient in single conductor. It combines aspects of Seebeck (temperature difference produces emf) and Peltier (current causes heat transfer at junctions) effects in thermoelectric phenomena.
Thomson effect involves heat absorption/emission when current flows through temperature gradient in single conductor. It combines aspects of Seebeck (temperature difference produces emf) and Peltier (current causes heat transfer at junctions) effects in thermoelectric phenomena.
6. Define beat and beat frequency. Click Now
Beat is the phenomenon that occurs when two sound waves of slightly different frequencies interfere with each other, producing a sound whose loudness varies periodically. This variation is heard as a throbbing or pulsing sound. Beat frequency is defined as the number of beats heard per second. It is equal to the absolute difference between the frequencies of the two interfering sound waves. For example, if two waves of frequencies 256 Hz and 260 Hz interfere, the beat frequency will be |260 − 256| = 4 Hz, meaning 4 beats are heard per second.
Beat is the phenomenon that occurs when two sound waves of slightly different frequencies interfere with each other, producing a sound whose loudness varies periodically. This variation is heard as a throbbing or pulsing sound. Beat frequency is defined as the number of beats heard per second. It is equal to the absolute difference between the frequencies of the two interfering sound waves. For example, if two waves of frequencies 256 Hz and 260 Hz interfere, the beat frequency will be |260 − 256| = 4 Hz, meaning 4 beats are heard per second.
2068 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Is dimensionally correct equation to be a correct physical relation?
Dimensionally correct equation is necessary but not sufficient for physical correctness. It must also have correct numerical constants and apply within physical constraints. Dimensional homogeneity checks form but not complete validity of physical relations.
Dimensionally correct equation is necessary but not sufficient for physical correctness. It must also have correct numerical constants and apply within physical constraints. Dimensional homogeneity checks form but not complete validity of physical relations.
2. Mention the various methods for controlling air pollution.
Methods include using cleaner fuels, installing scrubbers/filters in industries, promoting public transport, afforestation, enforcing emission standards, adopting renewable energy, and developing green technologies to reduce pollutant release into atmosphere.
Methods include using cleaner fuels, installing scrubbers/filters in industries, promoting public transport, afforestation, enforcing emission standards, adopting renewable energy, and developing green technologies to reduce pollutant release into atmosphere.
3. How do you covert a galvanometer into an ammeter?
Connect low resistance shunt (S) parallel to galvanometer: S = G/(n-1) where G=galvanometer resistance, n=I/Ig desired current range expansion. This diverts most current through shunt, protecting galvanometer while measuring larger currents.
Connect low resistance shunt (S) parallel to galvanometer: S = G/(n-1) where G=galvanometer resistance, n=I/Ig desired current range expansion. This diverts most current through shunt, protecting galvanometer while measuring larger currents.
4. The velocity of sound is greater in solids than in gases at NTP, why?
Sound velocity v=√(E/ρ) where E=elastic modulus. Solids have much higher elastic moduli than gases, outweighing higher density. Strong intermolecular forces in solids allow faster energy transmission despite greater density compared to gases.
Sound velocity v=√(E/ρ) where E=elastic modulus. Solids have much higher elastic moduli than gases, outweighing higher density. Strong intermolecular forces in solids allow faster energy transmission despite greater density compared to gases.
5. Distinguish between magnetic lines of force and electric lines of force.
“Magnetic lines of force and electric lines of force are two ways to represent fields, but they differ in origin and behavior. Magnetic lines of force originate from the north pole of a magnet and terminate at the south pole, forming continuous closed loops even passing through the magnet itself. They represent the direction and strength of the magnetic field, and two magnetic lines of force never intersect. In contrast, electric lines of force originate from positive charges and terminate on negative charges; they are not closed loops. Like magnetic lines, they indicate the direction and strength of the electric field, and two electric lines of force also never intersect. Thus, while magnetic lines form continuous loops, electric lines always start and end on charges.”
“Magnetic lines of force and electric lines of force are two ways to represent fields, but they differ in origin and behavior. Magnetic lines of force originate from the north pole of a magnet and terminate at the south pole, forming continuous closed loops even passing through the magnet itself. They represent the direction and strength of the magnetic field, and two magnetic lines of force never intersect. In contrast, electric lines of force originate from positive charges and terminate on negative charges; they are not closed loops. Like magnetic lines, they indicate the direction and strength of the electric field, and two electric lines of force also never intersect. Thus, while magnetic lines form continuous loops, electric lines always start and end on charges.”
6. The surface of electric machine is made smooth, why?
Smooth surfaces reduce corona discharge by preventing electric field concentration. They minimize dust accumulation improving insulation, enhance heat dissipation, and reduce surface resistance for better electrical performance in machines.
Smooth surfaces reduce corona discharge by preventing electric field concentration. They minimize dust accumulation improving insulation, enhance heat dissipation, and reduce surface resistance for better electrical performance in machines.
7. What is relative humidity?
Relative humidity is ratio of actual water vapor pressure to saturation vapor pressure at same temperature, expressed as percentage. It indicates air’s moisture content relative to maximum possible at that temperature, affecting comfort and precipitation.
Relative humidity is ratio of actual water vapor pressure to saturation vapor pressure at same temperature, expressed as percentage. It indicates air’s moisture content relative to maximum possible at that temperature, affecting comfort and precipitation.
2067 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Find the dimensional formula of surface tension. Click Now
Surface tension γ=F/l gives [γ]=[MT⁻²] from force per unit length. This represents energy per unit area (J/m²) with dimensions showing dependence on mass and inverse square of time for liquid surface properties.
Surface tension γ=F/l gives [γ]=[MT⁻²] from force per unit length. This represents energy per unit area (J/m²) with dimensions showing dependence on mass and inverse square of time for liquid surface properties.
2. Why are springs made up of steel not of copper?
Steel has higher elastic limit and Young’s modulus than copper, allowing greater deformation without permanent set. Steel’s better fatigue resistance and higher yield strength make it suitable for repeated spring action applications.
Steel has higher elastic limit and Young’s modulus than copper, allowing greater deformation without permanent set. Steel’s better fatigue resistance and higher yield strength make it suitable for repeated spring action applications.
3. Differentiate between transverse and longitudinal wave.
Click Now
Click Now
4. What are safety measures from radiation hazards?
Safety measures include shielding (lead/concrete), maintaining distance from source, limiting exposure time, using protective clothing, monitoring with dosimeters, proper storage/disposal, and following safety protocols in radiation facilities.
Safety measures include shielding (lead/concrete), maintaining distance from source, limiting exposure time, using protective clothing, monitoring with dosimeters, proper storage/disposal, and following safety protocols in radiation facilities.
5. How do you convert a galvanometer into a voltmeter?
Connect high resistance multiplier (R) series with galvanometer: R = V/Ig – G where V=desired voltage range, Ig=galvanometer current, G=its resistance. This limits current through galvanometer while measuring voltage across combination.
Connect high resistance multiplier (R) series with galvanometer: R = V/Ig – G where V=desired voltage range, Ig=galvanometer current, G=its resistance. This limits current through galvanometer while measuring voltage across combination.
6. Above curie temp a ferromagnetic materials become paramagnetic’, why?
Above Curie temperature, thermal energy overcomes exchange interaction aligning magnetic domains. Random thermal motion destroys spontaneous magnetization, changing ferromagnetic material to paramagnetic with much weaker, temperature-dependent magnetic susceptibility.
Above Curie temperature, thermal energy overcomes exchange interaction aligning magnetic domains. Random thermal motion destroys spontaneous magnetization, changing ferromagnetic material to paramagnetic with much weaker, temperature-dependent magnetic susceptibility.
7. What are cathode rays?
Cathode rays are electron streams emitted from cathode in low-pressure discharge tube. They travel straight, cast shadows, deflect in electric/magnetic fields, produce X-rays on striking matter, and have specific e/m ratio showing particle nature.
Cathode rays are electron streams emitted from cathode in low-pressure discharge tube. They travel straight, cast shadows, deflect in electric/magnetic fields, produce X-rays on striking matter, and have specific e/m ratio showing particle nature.
8. Nothing happens to a bird standing on high power line but get fatal shock by touching a man to it, why?
Bird experiences same potential on both feet with negligible current. Human touching line creates potential difference between line and ground, causing large current through body to ground resulting in fatal electric shock from high voltage.
Bird experiences same potential on both feet with negligible current. Human touching line creates potential difference between line and ground, causing large current through body to ground resulting in fatal electric shock from high voltage.
9. What is Snell’s law?
Snell’s law states n₁sinθ₁ = n₂sinθ₂ where n=refractive index, θ=angle with normal. It governs refraction at interface between two media, determining bending direction based on refractive indices and incidence angle relationships.
Snell’s law states n₁sinθ₁ = n₂sinθ₂ where n=refractive index, θ=angle with normal. It governs refraction at interface between two media, determining bending direction based on refractive indices and incidence angle relationships.
10. What is the ratio of maximum to minimum resistance when a wire is stretched to double of its length?
Click Now
Click Now
2066 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Why the antiseptics used for cuts and wounds in human flesh have low surface tensions?
Low surface tension allows antiseptics to spread easily over wound surfaces, penetrate tissue crevices, and mix with bodily fluids for better coverage and effectiveness in killing microorganisms while promoting wound healing processes.
Low surface tension allows antiseptics to spread easily over wound surfaces, penetrate tissue crevices, and mix with bodily fluids for better coverage and effectiveness in killing microorganisms while promoting wound healing processes.
2. Why electrolytes have lower conductivity than metallic conductors?
Electrolytes conduct via ion movement through solution, slower than electron movement in metals. Ionic mobility is lower, ion concentration limited by solubility, and viscosity hinders movement, resulting in lower conductivity than metallic electron conduction.
Electrolytes conduct via ion movement through solution, slower than electron movement in metals. Ionic mobility is lower, ion concentration limited by solubility, and viscosity hinders movement, resulting in lower conductivity than metallic electron conduction.
3. The horizontal and vertical components of the earth’s magnetic field at a place are equal, what is the value of dip at the place?
When BH=BV, tanθ=BV/BH=1 so θ=45°. Dip angle is 45° where horizontal and vertical components equal, occurring at magnetic latitude where Earth’s field has equal horizontal and vertical intensity components.
When BH=BV, tanθ=BV/BH=1 so θ=45°. Dip angle is 45° where horizontal and vertical components equal, occurring at magnetic latitude where Earth’s field has equal horizontal and vertical intensity components.
4. What is the difference between the deflection of the electron due to electric and magnetic fields?
Electric field deflects electron parallel to field with parabolic path (F=qE). Magnetic field deflects perpendicular to both v and B with circular path (F=qv×B). Electric deflection depends on charge, magnetic on charge and velocity product.
Electric field deflects electron parallel to field with parabolic path (F=qE). Magnetic field deflects perpendicular to both v and B with circular path (F=qv×B). Electric deflection depends on charge, magnetic on charge and velocity product.
2065 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. During winter, we feel that metal are colder than wood. Why?
Metal has higher thermal conductivity than wood, quickly conducting heat away from hand. This rapid heat loss makes metal feel colder even at same temperature, while wood’s lower conductivity minimizes heat transfer sensation.
Metal has higher thermal conductivity than wood, quickly conducting heat away from hand. This rapid heat loss makes metal feel colder even at same temperature, while wood’s lower conductivity minimizes heat transfer sensation.
2. Can two people on the moon talk to each other? Explain.
No, because moon has no atmosphere to transmit sound waves. Sound requires material medium for propagation through particle vibrations. In vacuum, sound cannot travel, requiring radio communication instead of direct talking.
No, because moon has no atmosphere to transmit sound waves. Sound requires material medium for propagation through particle vibrations. In vacuum, sound cannot travel, requiring radio communication instead of direct talking.
3. Write two properties of ferromagnetic substance.
Ferromagnetic substances have high susceptibility, show hysteresis with residual magnetization, possess Curie temperature above which become paramagnetic, and form permanent magnets with strong attraction to magnetic fields.
Ferromagnetic substances have high susceptibility, show hysteresis with residual magnetization, possess Curie temperature above which become paramagnetic, and form permanent magnets with strong attraction to magnetic fields.
4. What is meant by deviation of light?
Deviation is angle between incident ray direction and emergent ray direction after reflection/refraction. It measures how much light path changes at surfaces like mirrors/prisms, important in optical instrument design and analysis.
Deviation is angle between incident ray direction and emergent ray direction after reflection/refraction. It measures how much light path changes at surfaces like mirrors/prisms, important in optical instrument design and analysis.
5. Differentiate between cathode ray and alpha ray. Click Now
Cathode rays are electrons (negative charge) from discharge tubes. Alpha rays are helium nuclei (positive charge) from radioactive decay. Alpha rays have less penetration but more ionization than cathode rays with different origins.
Cathode rays are electrons (negative charge) from discharge tubes. Alpha rays are helium nuclei (positive charge) from radioactive decay. Alpha rays have less penetration but more ionization than cathode rays with different origins.
6. What is triple point of water?
Triple point is unique temperature (0.01°C) and pressure (611.657 Pa) where water coexists in solid, liquid, and vapor phases simultaneously. It serves as fundamental reference point in thermometry and phase diagram studies.
Triple point is unique temperature (0.01°C) and pressure (611.657 Pa) where water coexists in solid, liquid, and vapor phases simultaneously. It serves as fundamental reference point in thermometry and phase diagram studies.
2064 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Leaves fall from the tree when it is shaken, why?
Shaking applies force overcoming weak petiole attachment. Inertia keeps leaves stationary while branch moves, creating relative motion that breaks attachment. Dry/dead leaves have weaker connections making them fall more easily when shaken.
Shaking applies force overcoming weak petiole attachment. Inertia keeps leaves stationary while branch moves, creating relative motion that breaks attachment. Dry/dead leaves have weaker connections making them fall more easily when shaken.
2. Find the dimension of linear momentum.
Linear momentum p=mv gives [p]=[M][LT⁻¹]=[MLT⁻¹]. This dimension appears in Newton’s second law (F=dp/dt) and conservation laws, representing quantity of motion with mass and velocity dependence characteristics.
Linear momentum p=mv gives [p]=[M][LT⁻¹]=[MLT⁻¹]. This dimension appears in Newton’s second law (F=dp/dt) and conservation laws, representing quantity of motion with mass and velocity dependence characteristics.
3. What is transverse wave?
Transverse wave has particle vibration perpendicular to propagation direction. Examples include light waves, string vibrations, and water surface waves. They can be polarized and don’t require medium (EM waves) or need solid/liquid medium.
Transverse wave has particle vibration perpendicular to propagation direction. Examples include light waves, string vibrations, and water surface waves. They can be polarized and don’t require medium (EM waves) or need solid/liquid medium.
4. At what temperature, Celsius and Fahrenheit scales coincide?
Setting C=F in conversion F=(9/5)C+32 gives C=(9/5)C+32, solving yields C=F=-40°. At -40°, both scales read same numerical value due to different zero points and scaling factors intersecting at this temperature.
Setting C=F in conversion F=(9/5)C+32 gives C=(9/5)C+32, solving yields C=F=-40°. At -40°, both scales read same numerical value due to different zero points and scaling factors intersecting at this temperature.
5. What are the conditions to be total internal reflection?
Conditions: Light must travel from denser to rarer medium, incidence angle must exceed critical angle (θ>θc where sinθc=n₂/n₁), and no refraction into rarer medium occurs with complete reflection back into denser medium.
Conditions: Light must travel from denser to rarer medium, incidence angle must exceed critical angle (θ>θc where sinθc=n₂/n₁), and no refraction into rarer medium occurs with complete reflection back into denser medium.
6. Ammeter are always connected in series in a electrical circuit, why?
Ammeter measures current flowing through circuit, requiring series connection so same current passes through it. Low resistance ensures minimal voltage drop and circuit disturbance while accurately measuring current in series path.
Ammeter measures current flowing through circuit, requiring series connection so same current passes through it. Low resistance ensures minimal voltage drop and circuit disturbance while accurately measuring current in series path.
7. What do you mean by mass defect?
Mass defect is difference between sum of individual nucleon masses and actual nuclear mass. This “missing mass” converts to binding energy via E=Δmc² during nucleus formation, representing nuclear stability measure.
Mass defect is difference between sum of individual nucleon masses and actual nuclear mass. This “missing mass” converts to binding energy via E=Δmc² during nucleus formation, representing nuclear stability measure.
8. Can plane mirror forms a real image? Explain with figure.
Plane mirrors always form virtual images behind mirror at same distance as object in front. Real images require light rays actually converging, impossible with plane mirrors which only produce apparent convergence point behind mirror surface.
Plane mirrors always form virtual images behind mirror at same distance as object in front. Real images require light rays actually converging, impossible with plane mirrors which only produce apparent convergence point behind mirror surface.
9. How the gold leaf electroscope is charged with positive?
Touch positive rod to electroscope cap, transferring positive charge by conduction. Alternatively, bring positive rod near cap inducing negative charge on leaves through induction, then ground electroscope to remove negative charge leaving net positive.
Touch positive rod to electroscope cap, transferring positive charge by conduction. Alternatively, bring positive rod near cap inducing negative charge on leaves through induction, then ground electroscope to remove negative charge leaving net positive.
10. What is ozone hole? Write its effects.
Ozone hole is atmospheric region with severely depleted ozone layer, mainly over Antarctica. Effects include increased UV radiation reaching Earth causing skin cancer, eye cataracts, immune suppression, and ecosystem damage to plankton/crops.
Ozone hole is atmospheric region with severely depleted ozone layer, mainly over Antarctica. Effects include increased UV radiation reaching Earth causing skin cancer, eye cataracts, immune suppression, and ecosystem damage to plankton/crops.
2063 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Find the dimensional formula of pressure and power.
Pressure P=F/A gives [P]=[ML⁻¹T⁻²]. Power P=W/t gives [P]=[ML²T⁻³]. Pressure measures force per area while power measures energy transfer rate, with different dimensional formulas reflecting their distinct physical meanings.
Pressure P=F/A gives [P]=[ML⁻¹T⁻²]. Power P=W/t gives [P]=[ML²T⁻³]. Pressure measures force per area while power measures energy transfer rate, with different dimensional formulas reflecting their distinct physical meanings.
2. Determine the unit and dimension of centripetal force.
Unit: newton (N). Dimension: [MLT⁻²] from F=mv²/r or mrω². Centripetal force maintains circular motion directed toward center, with same dimensions as any force but specific circular motion application characteristics.
Unit: newton (N). Dimension: [MLT⁻²] from F=mv²/r or mrω². Centripetal force maintains circular motion directed toward center, with same dimensions as any force but specific circular motion application characteristics.
3. It is possible that displacement is zero but not distance? Explain with example.
Yes, displacement zero with non-zero distance when returning to start point. Example: Walking 100m north then 100m south gives 200m distance but zero displacement. Circular path returns to origin with distance traveled but zero net displacement.
Yes, displacement zero with non-zero distance when returning to start point. Example: Walking 100m north then 100m south gives 200m distance but zero displacement. Circular path returns to origin with distance traveled but zero net displacement.
4. At which angle the stone is projected for maximum horizontal range? Click Now
Maximum range at 45° projection in vacuum (no air resistance). With air resistance, optimal angle slightly less (~42°). Range R=(u²sin2θ)/g maximizes when sin2θ=1 giving θ=45° for ideal projectile conditions.
Maximum range at 45° projection in vacuum (no air resistance). With air resistance, optimal angle slightly less (~42°). Range R=(u²sin2θ)/g maximizes when sin2θ=1 giving θ=45° for ideal projectile conditions.
5. A wet cloth is put on the forehead of a person during high fever, why?
Wet cloth cools through evaporation absorbing body heat as latent heat. This reduces forehead temperature, provides comfort, and helps lower overall body temperature through conductive heat transfer during fever conditions.
Wet cloth cools through evaporation absorbing body heat as latent heat. This reduces forehead temperature, provides comfort, and helps lower overall body temperature through conductive heat transfer during fever conditions.
6. What is angle of dip?
Angle of dip is vertical angle between Earth’s magnetic field and horizontal plane. It varies from 0° at magnetic equator to 90° at magnetic poles, measured by dip circle indicating magnetic field inclination at location.
Angle of dip is vertical angle between Earth’s magnetic field and horizontal plane. It varies from 0° at magnetic equator to 90° at magnetic poles, measured by dip circle indicating magnetic field inclination at location.
7. Change 98°F to Celsius scale. Click now
Using C=(5/9)(F-32): C=(5/9)(98-32)=(5/9)×66=36.67°C. Thus 98°F equals approximately 36.7°C, representing normal human body temperature in Fahrenheit converted to Celsius scale equivalent value.
Using C=(5/9)(F-32): C=(5/9)(98-32)=(5/9)×66=36.67°C. Thus 98°F equals approximately 36.7°C, representing normal human body temperature in Fahrenheit converted to Celsius scale equivalent value.
8. What is the effect of pressure on melting point of a substance?
For most substances, increased pressure raises melting point (positive dP/dT). Exception: Ice melts under pressure (regelation) with lowered melting point due to volume decrease upon melting (negative dP/dT).
For most substances, increased pressure raises melting point (positive dP/dT). Exception: Ice melts under pressure (regelation) with lowered melting point due to volume decrease upon melting (negative dP/dT).
9. A convex mirror is used in vehicles as a side mirror, why?
Convex mirrors provide wider field of view showing more area behind/side. Although images are smaller, this enhances safety for lane changes and reversing. They also minimize glare from following vehicles’ headlights at night.
Convex mirrors provide wider field of view showing more area behind/side. Although images are smaller, this enhances safety for lane changes and reversing. They also minimize glare from following vehicles’ headlights at night.
10. Differentiate between saturated and unsaturated vapour. Click Now
Saturated and unsaturated vapours are two types of vapour that differ in their capacity to hold more molecules in the gaseous state. A saturated vapour is one in which the vapour is in equilibrium with its liquid or solid phase, meaning it cannot hold any more molecules at a given temperature and pressure; any additional molecules will condense. In contrast, an unsaturated vapour is one that can still hold more molecules of the substance in the gaseous state at the same temperature and pressure. Unsaturated vapour is not in equilibrium with its liquid or solid phase, so it has the capacity to evaporate further. Thus, saturation depends on the maximum limit of vapour at a given condition, while unsaturated vapour is below that limit.
Saturated and unsaturated vapours are two types of vapour that differ in their capacity to hold more molecules in the gaseous state. A saturated vapour is one in which the vapour is in equilibrium with its liquid or solid phase, meaning it cannot hold any more molecules at a given temperature and pressure; any additional molecules will condense. In contrast, an unsaturated vapour is one that can still hold more molecules of the substance in the gaseous state at the same temperature and pressure. Unsaturated vapour is not in equilibrium with its liquid or solid phase, so it has the capacity to evaporate further. Thus, saturation depends on the maximum limit of vapour at a given condition, while unsaturated vapour is below that limit.
11. What is refractive index of a transparent medium?
Refractive index n=c/v where c=light speed in vacuum, v=speed in medium. It measures light bending ability, with n>1 for all materials. Determined by Snell’s law n₁sinθ₁=n₂sinθ₂ at interface between media.
Refractive index n=c/v where c=light speed in vacuum, v=speed in medium. It measures light bending ability, with n>1 for all materials. Determined by Snell’s law n₁sinθ₁=n₂sinθ₂ at interface between media.
12. State Faraday’s laws of electrolysis.
First law: Mass deposited/dissolved proportional to charge (m∝Q). Second law: For same charge, masses proportional to chemical equivalents (m₁/m₂=E₁/E₂). Combined: m=ZIt where Z=electrochemical equivalent.
First law: Mass deposited/dissolved proportional to charge (m∝Q). Second law: For same charge, masses proportional to chemical equivalents (m₁/m₂=E₁/E₂). Combined: m=ZIt where Z=electrochemical equivalent.
2062 BS- CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Distinguish between regular and diffuse reflection of light.
Regular reflection occurs from smooth surfaces with parallel incident rays remaining parallel after reflection (mirrors). Diffuse reflection from rough surfaces scatters light in different directions, making objects visible from various angles.
Regular reflection occurs from smooth surfaces with parallel incident rays remaining parallel after reflection (mirrors). Diffuse reflection from rough surfaces scatters light in different directions, making objects visible from various angles.
2. What is photoelectric effect?
Photoelectric effect is electron emission from metal surface when light of sufficient frequency strikes it. Explained by Einstein using photon concept with hν=φ+KEmax equation, demonstrating light’s particle nature and quantum physics.
Photoelectric effect is electron emission from metal surface when light of sufficient frequency strikes it. Explained by Einstein using photon concept with hν=φ+KEmax equation, demonstrating light’s particle nature and quantum physics.
3. Write the important properties of x-rays?
X-rays penetrate matter, affect photographic plates, cause fluorescence, ionize gases, not deflected by fields, have short wavelengths (0.01-10nm), travel light speed, and show wave properties like diffraction/interference in crystals.
X-rays penetrate matter, affect photographic plates, cause fluorescence, ionize gases, not deflected by fields, have short wavelengths (0.01-10nm), travel light speed, and show wave properties like diffraction/interference in crystals.
4. Distinguish between heat and temperature. Click Now
Heat is energy transfer due to temperature difference measured in joules. Temperature is degree of hotness measured in °C/K/°F indicating molecular kinetic energy average. Heat is extensive, temperature intensive property.
Heat is energy transfer due to temperature difference measured in joules. Temperature is degree of hotness measured in °C/K/°F indicating molecular kinetic energy average. Heat is extensive, temperature intensive property.
5. Discuss briefly about the harmful aspects of radiation.
Radiation harms include tissue damage, cancer induction, genetic mutations, radiation sickness, environmental contamination, and long-term ecological effects. Proper shielding, distance, and time limits minimize exposure risks from radioactive materials.
Radiation harms include tissue damage, cancer induction, genetic mutations, radiation sickness, environmental contamination, and long-term ecological effects. Proper shielding, distance, and time limits minimize exposure risks from radioactive materials.
2061 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. Differentiate between uniform and non-uniform motion. Click Now
Uniform motion has constant velocity (equal displacements in equal times). Non-uniform motion has changing velocity (unequal displacements in equal times). Acceleration zero in uniform motion, non-zero in non-uniform motion along path.
Uniform motion has constant velocity (equal displacements in equal times). Non-uniform motion has changing velocity (unequal displacements in equal times). Acceleration zero in uniform motion, non-zero in non-uniform motion along path.
2. Define upthrust? What are the factors on which it depends?
Upthrust is upward buoyant force on immersed object equal to weight of displaced fluid. Depends on fluid density, volume immersed, and gravitational acceleration (F=ρVg). It causes objects to float/sink based on density comparisons.
Upthrust is upward buoyant force on immersed object equal to weight of displaced fluid. Depends on fluid density, volume immersed, and gravitational acceleration (F=ρVg). It causes objects to float/sink based on density comparisons.
3. Define heat capacity and specific heat capacity.
Heat capacity of a body is defined as the amount of heat required to raise the temperature of the entire body by 1°C (or 1 K). Its SI unit is joule per kelvin (J/K). Heat capacity depends on the mass and nature of the substance. Specific heat capacity is the amount of heat required to raise the temperature of 1 kilogram of a substance by 1°C (or 1 K). Its SI unit is joule per kilogram per kelvin (J/kg·K). Unlike heat capacity, it is an intensive property and depends only on the nature of the substance, not on its mass.
Heat capacity of a body is defined as the amount of heat required to raise the temperature of the entire body by 1°C (or 1 K). Its SI unit is joule per kelvin (J/K). Heat capacity depends on the mass and nature of the substance. Specific heat capacity is the amount of heat required to raise the temperature of 1 kilogram of a substance by 1°C (or 1 K). Its SI unit is joule per kilogram per kelvin (J/kg·K). Unlike heat capacity, it is an intensive property and depends only on the nature of the substance, not on its mass.
4. Bells are made up of metals but not wood. Why?
Metals have higher elasticity producing clear ringing sounds through sustained vibrations. They conduct sound better with specific acoustic properties creating desired tone quality, while wood produces dull sounds with faster vibration damping.
Metals have higher elasticity producing clear ringing sounds through sustained vibrations. They conduct sound better with specific acoustic properties creating desired tone quality, while wood produces dull sounds with faster vibration damping.
5. State Coulomb’s law of magnetism?
Coulomb’s law for magnetism: F=(μ₀/4π)(m₁m₂/r²) where m=pole strength. Like poles repel, unlike attract with force proportional to product of pole strengths and inversely proportional to square of distance between them.
Coulomb’s law for magnetism: F=(μ₀/4π)(m₁m₂/r²) where m=pole strength. Like poles repel, unlike attract with force proportional to product of pole strengths and inversely proportional to square of distance between them.
6. What are the medical uses of ultrasonic wave?
Ultrasonic waves medically used for imaging (sonography), breaking kidney stones (lithotripsy), physiotherapy, dental cleaning, surgical cutting, and diagnostic applications through non-invasive visualization of internal organs and tissues.
Ultrasonic waves medically used for imaging (sonography), breaking kidney stones (lithotripsy), physiotherapy, dental cleaning, surgical cutting, and diagnostic applications through non-invasive visualization of internal organs and tissues.
7. What is meant by Faraday’s constant?
Faraday’s constant (F) is charge of one mole electrons: F=NAe=96485 C/mol. It relates electrical charge to chemical change in electrolysis, appearing in Faraday’s laws as proportionality constant between charge and substance amount.
Faraday’s constant (F) is charge of one mole electrons: F=NAe=96485 C/mol. It relates electrical charge to chemical change in electrolysis, appearing in Faraday’s laws as proportionality constant between charge and substance amount.
8. Explain why a discharge tube appears dark when evacuated to a very low pressure.
At very low pressure, insufficient gas molecules exist for collisions exciting atoms to emit light. Mean free path becomes very long, electrons travel without collisions, and gas doesn’t glow, making discharge tube appear dark.
At very low pressure, insufficient gas molecules exist for collisions exciting atoms to emit light. Mean free path becomes very long, electrons travel without collisions, and gas doesn’t glow, making discharge tube appear dark.
9. Write four properties of γ (gamma) rays.
Gamma rays are electromagnetic waves with shortest wavelength, highest penetration, no charge/mass, travel light speed, cause ionization, not deflected by fields, originate from nuclear transitions, and have medical/industrial uses.
Gamma rays are electromagnetic waves with shortest wavelength, highest penetration, no charge/mass, travel light speed, cause ionization, not deflected by fields, originate from nuclear transitions, and have medical/industrial uses.
10. Define dip and declination.
Dip (inclination) is vertical angle between Earth’s magnetic field and horizontal. Declination is horizontal angle between geographic and magnetic meridians. Both vary with location and time for navigation and magnetic studies.
Dip (inclination) is vertical angle between Earth’s magnetic field and horizontal. Declination is horizontal angle between geographic and magnetic meridians. Both vary with location and time for navigation and magnetic studies.
11. Define nuclear fission and fusion. Click Now
Nuclear fission is the process in which a heavy nucleus splits into two or more lighter nuclei, along with the release of a large amount of energy and neutrons. It is usually induced by the absorption of a neutron and is used in nuclear power plants and atomic bombs. Nuclear fusion is the process in which two light nuclei combine to form a heavier nucleus, releasing a tremendous amount of energy. Fusion occurs naturally in stars, including the Sun, and is considered a potential source of clean and abundant energy on Earth.
Nuclear fission is the process in which a heavy nucleus splits into two or more lighter nuclei, along with the release of a large amount of energy and neutrons. It is usually induced by the absorption of a neutron and is used in nuclear power plants and atomic bombs. Nuclear fusion is the process in which two light nuclei combine to form a heavier nucleus, releasing a tremendous amount of energy. Fusion occurs naturally in stars, including the Sun, and is considered a potential source of clean and abundant energy on Earth.
12. Distinguish between potential difference and emf. Click Now
Electromotive force (EMF) is the total energy supplied by a source per unit charge when no current is drawn, i.e., in an open circuit. It represents the maximum voltage the source can provide. Potential difference (P.D.) is the energy per unit charge supplied between two points of a conductor when current is flowing, i.e., in a closed circuit. Due to internal resistance, P.D. is less than EMF when the source delivers current.
Electromotive force (EMF) is the total energy supplied by a source per unit charge when no current is drawn, i.e., in an open circuit. It represents the maximum voltage the source can provide. Potential difference (P.D.) is the energy per unit charge supplied between two points of a conductor when current is flowing, i.e., in a closed circuit. Due to internal resistance, P.D. is less than EMF when the source delivers current.
13. What is difference between standing and progressive wave? Click Now
Progressive waves transfer energy with all particles oscillating similarly. Standing waves have stationary nodes/antinodes with no energy transfer, forming from two identical waves traveling opposite directions interfering with each other.
Progressive waves transfer energy with all particles oscillating similarly. Standing waves have stationary nodes/antinodes with no energy transfer, forming from two identical waves traveling opposite directions interfering with each other.
14. Write four possible ways of minimizing water pollution.
Minimize water pollution by treating industrial/domestic waste before discharge, reducing agricultural chemical runoff, proper oil/hazardous waste disposal, promoting water conservation, and implementing strict environmental regulations with monitoring.
Minimize water pollution by treating industrial/domestic waste before discharge, reducing agricultural chemical runoff, proper oil/hazardous waste disposal, promoting water conservation, and implementing strict environmental regulations with monitoring.
15. Write two properties to electric lines of force.
Electric lines start on positive charges end on negative charges, never intersect, density indicates field strength, tangent gives direction, perpendicular to conductor surfaces, and show repulsion/attraction between charges visually.
Electric lines start on positive charges end on negative charges, never intersect, density indicates field strength, tangent gives direction, perpendicular to conductor surfaces, and show repulsion/attraction between charges visually.
2060 BS – CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
1. What are the difference between speed and velocity? Click Now
Speed and velocity are both measures of motion, but they differ in definition and properties. Speed is a scalar quantity that represents the rate at which an object covers distance, regardless of its direction. It only tells how fast an object is moving and is always positive or zero. Velocity, on the other hand, is a vector quantity that represents the rate of change of displacement of an object in a specific direction. It provides both magnitude and direction, and can be positive, negative, or zero depending on the motion. Thus, while speed gives only the magnitude of motion, velocity gives a complete description of motion including direction.
Speed and velocity are both measures of motion, but they differ in definition and properties. Speed is a scalar quantity that represents the rate at which an object covers distance, regardless of its direction. It only tells how fast an object is moving and is always positive or zero. Velocity, on the other hand, is a vector quantity that represents the rate of change of displacement of an object in a specific direction. It provides both magnitude and direction, and can be positive, negative, or zero depending on the motion. Thus, while speed gives only the magnitude of motion, velocity gives a complete description of motion including direction.
2. Define relative density.
Relative density is ratio of substance density to water density at 4°C (1000 kg/m³). Dimensionless quantity also called specific gravity indicating whether material floats (RD<1) or sinks (RD>1) in water for comparison.
Relative density is ratio of substance density to water density at 4°C (1000 kg/m³). Dimensionless quantity also called specific gravity indicating whether material floats (RD<1) or sinks (RD>1) in water for comparison.
3. If a spherical mirror is immersed in water, does its focal length change?
No, spherical mirror focal length doesn’t change in water because reflection (not refraction) governs image formation. Mirror formula 1/f=1/u+1/v remains valid regardless of surrounding medium since reflection depends only on surface geometry.
No, spherical mirror focal length doesn’t change in water because reflection (not refraction) governs image formation. Mirror formula 1/f=1/u+1/v remains valid regardless of surrounding medium since reflection depends only on surface geometry.
4. State Coulomb’s law of electrostatics.
Coulomb’s law: F=(1/4πε₀)(q₁q₂/r²) where like charges repel, unlike attract. Force proportional to product of charges, inversely proportional to square of distance between them, acting along line joining charges in vacuum.
Coulomb’s law: F=(1/4πε₀)(q₁q₂/r²) where like charges repel, unlike attract. Force proportional to product of charges, inversely proportional to square of distance between them, acting along line joining charges in vacuum.
5. What causes pollution? Give some examples.
Pollution caused by human activities: industrial emissions, vehicle exhaust, agricultural chemicals, waste disposal, deforestation, and fossil fuel combustion. Natural causes include volcanoes, wildfires, and dust storms contributing to environmental pollution.
Pollution caused by human activities: industrial emissions, vehicle exhaust, agricultural chemicals, waste disposal, deforestation, and fossil fuel combustion. Natural causes include volcanoes, wildfires, and dust storms contributing to environmental pollution.
CTEVT Physics Very Short Questions 2060-2082 BS with Solutions
For educational purposes | AK LEARNING NEPAL
📘 Latest Related Questions
- Class 12 NEB Account Set A Solution 2083 |
- NEB Model Question (Set A) Accounting Question 22 Solution | The opening and closing balance of inventories are as below:
- NEB Model Question (Set A) Accounting Question 21 Solution | The Balance Sheet of a company on 31st December were given below:
- NEB Model Question (Set A) Accounting Question 20 Solution | The following Trial Balance of a company as on 31st Chaitra last year is given below:
- NEB Model Question (Set A) Accounting Question 19 Solution | Explain the features of accounting software.
- NEB Model Question (Set A) Accounting Question 18 Solution | The time allowed to produce 80 units of output is 2 hours. A worker produced 400 units during the month. Wages rate per hour is Rs. 800. Find the wages of the worker.
- NEB Model Question (Set A) Accounting Question 17 Solution | State the meaning of material classification with suitable examples.
- NEB Model Question (Set A) Accounting Question 15 Solution | The Trial Balance of a Company Ltd. as on 31st Chaitra last year is given below:
- NEB Model Question (Set A) Accounting Question 16 Solution | Differentiate between cost accounting and financial accounting.
- NEB Model Question (Set A) Accounting Question 14 Solution | Following information was taken from a company as on 31st Ashad, last year:
- NEB Model Question (Set A) Accounting Question 12 Solution | A Company Ltd. invited applications for 30,000 shares of Rs. 100 each at 10% premium. Payment: Application Rs. 30, Allotment Rs. 40, First & Final Call Rs. 40. Received 42,000 applications. Allotment: 25,000 full, 10,000 50%, 7,000 rejected. Excess money adjusted with allotment. Call money on 200 shares not received.
- NEB Model Question (Set A) Accounting Question 13 Solution | A company purchased the following assets at an agreed price of Rs. 1,100,000: Plant Rs. 520,000, Land and Building Rs. 730,000. The company paid the agreed price by issuing shares of Rs. 100 each at 20% discount. Required: Entries for purchase of assets and issue of shares.
- NEB
- Class 12 Old Is Gold 2083 App
- Class 11 Old Is Gold 2083 App
- Class 12 Nepali Old is Gold Set 1 Solution 2083 | NEB Exam Guide
- Class 10 OCE Social Studies Model Question Solution | SEE Social Studies 1 Sets Model Question Solution 2082
- Class 10 OCE Science Model Question Solution | SEE Science 3 Sets Model Question Solution2082
- Class 10 OCE Math Model Question Solution | SEE Math 3 Sets Model Question Solution
- mm