13232 + Interview Questions in Physics Page 56 InterviewSolution

2751.	eqivalent weight of water is
Answer» eqivalent weight of water is

Discussion

2752.	Which is the most commonly used fuel in thermal power plants?
Answer» Which is the most commonly used fuel in thermal power plants?

Discussion

2753.	‘Bicker’ means ‘to quarrel’. Why does the poet use this word here?
Answer» ‘Bicker’ means ‘to quarrel’. Why does the poet use this word here?

Discussion

2754.	The differential pressure transmitter of a flow meter using orifice reads 50 kg/m2 for a particular flow rate. If the flow rate is quartered (within the range of orifice), the corresponding reading of differential pressure transmitter across orifice in kg/m2 is _________?3.125
Answer» The differential pressure transmitter of a flow meter using orifice reads $50 {kg/m}^{2}$ for a particular flow rate. If the flow rate is quartered (within the range of orifice), the corresponding reading of differential pressure transmitter across orifice in ${kg/m}^{2}$ is _________? 3.125

Discussion

2755.	A ball moving on a table top eventually stops. Explain the reason.
Answer» A ball moving on a table top eventually stops. Explain the reason.

Discussion

2756.	A student measures that distance traversed in free fall of a body, initially at rest in given time. He uses this data to estimated g, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are e1 and e2, respectively, the percentage error in the estimation of g is ?
Answer» A student measures that distance traversed in free fall of a body, initially at rest in given time. He uses this data to estimated g, the acceleration due to gravity. If the maximum percentage error in measurement of the distance and the time are e1 and e2, respectively, the percentage error in the estimation of g is ?

Discussion

2757.	a person enters into a circular path of a radius r and moves on a circular path for t minutes and reaches the starting point. the angular displacement of the person is (i) Zero(ii) 2 pi(iii)pi(iv)2 r
Answer» a person enters into a circular path of a radius r and moves on a circular path for t minutes and reaches the starting point. the angular displacement of the person is (i) Zero (ii) 2 pi (iii)pi (iv)2 r

Discussion

2758.	If three balls of same radius are placed touching each other on a horizontal surface such that they will form an equilateral triangle, when their centers are joined. What will be the position of the centre of mass of the system?
Answer» If three balls of same radius are placed touching each other on a horizontal surface such that they will form an equilateral triangle, when their centers are joined. What will be the position of the centre of mass of the system?

Discussion

2759.	Which of the following is not a valid displacement-time graph of an object in motion?
Answer» Which of the following is not a valid displacement-time graph of an object in motion?

Discussion

2760.	velocity of sound in water depends upon bulk of modulus of water (B) and density of water.find the formula of it by dimensional analysi
Answer» velocity of sound in water depends upon bulk of modulus of water (B) and density of water.find the formula of it by dimensional analysi

Discussion

2761.	Water is filled up to a height h in a beaker of radius R. The density of water is ρ, the surface tension of water is T and the atmospheric pressure is P0. Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of the section by water on the other side of this section has magnitude:
Answer» Water is filled up to a height h in a beaker of radius R. The density of water is $ρ$ , the surface tension of water is T and the atmospheric pressure is $P_{0}$ . Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of the section by water on the other side of this section has magnitude:

Discussion

2762.	What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?
Answer» What is the acceleration of a van that starts from rest and attains a speed of $20 m s^{- 1}$ in $25 s$ ?

Discussion

2763.	Which of these is a convex mirror?
Answer» Which of these is a convex mirror?

Discussion

2764.	Position of a particle with respect to time is x=(3m/s)t-(1m/s^2) t^2. Find the speed of particle when t=2s.
Answer» Position of a particle with respect to time is x=(3m/s)t-(1m/s^2) t^2. Find the speed of particle when t=2s.

Discussion

2765.	Calculate the resistance of 1 km long copper wire of radius 1 mm. (Take specific resistance of copper =1.72×10−8 Ωm)
Answer» Calculate the resistance of 1 km long copper wire of radius 1 mm. (Take specific resistance of copper $= 1.72 \times 10^{- 8} Ω m$ )

Discussion

2766.	When 92U235 undergoes fission. 0.1% of its original mass is changed into energy. 9×10xJ of energy is released if 1 kg of 92U235 undergoes fission. Value of x = ___
Answer» When $_{92} U^{235}$ undergoes fission. 0.1% of its original mass is changed into energy. $9 \times 10^{x} J$ of energy is released if $1 k g$ of $_{92} U^{235}$ undergoes fission. Value of $x$ = ___

Discussion

2767.	3.The area of cross section of the wider tube is 800cm2 .If a mass of 16kg is placed on the massless piston ,find the difference in the levels of water in the two tubes.
Answer» 3.The area of cross section of the wider tube is 800cm2 .If a mass of 16kg is placed on the massless piston ,find the difference in the levels of water in the two tubes.

Discussion

2768.	When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is ___%. ___
Answer» When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is ___%. ___

Discussion

2769.	a telescope with objective of foval length 60cm and eye piece of focal length 5vm is focused on a far dis†an ce object such that the parallel rays emerge from eye piece. if object subtends an angle 2 on objective then angular width of image i
Answer» a telescope with objective of foval length 60cm and eye piece of focal length 5vm is focused on a far dis†an ce object such that the parallel rays emerge from eye piece. if object subtends an angle 2 on objective then angular width of image i

Discussion

2770.	A ladder 5cm long leaning against a wall.The bottom of the ladder is pulled along the ground,away from the wall,at the rate of 2cm/s.How fast is its height on the wall decreasing when the foot of the lader is 4m away from the wall?
Answer» A ladder 5cm long leaning against a wall.The bottom of the ladder is pulled along the ground,away from the wall,at the rate of 2cm/s.How fast is its height on the wall decreasing when the foot of the lader is 4m away from the wall?

Discussion

2771.	a rec†an gular †an k of base area 100m2 has height of 2m calculate the thrust at the bottom of the †an k if it is filled upto birm with water of density 10^3kh m^-
Answer» a rec†an gular †an k of base area 100m2 has height of 2m calculate the thrust at the bottom of the †an k if it is filled upto birm with water of density 10^3kh m^-

Discussion

2772.	How does satellites work.
Answer» How does satellites work.

Discussion

2773.	An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.
Answer» An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

Discussion

2774.	Question 03.4 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer.Marble floor with water spread over it
Answer» Question 03.4 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer. Marble floor with water spread over it

Discussion

2775.	If λ is the wavelength of incident radiation of intensity I, calculate no. of photons incident per second on an area A.
Answer» If $λ$ is the wavelength of incident radiation of intensity $I$ , calculate no. of photons incident per second on an area $A$ .

Discussion

2776.	What resistor should be connected in parallel with the 20 Ω resistor in branch ADC in the circuit shown in figure, so that potential difference between B and D may be zero ?
Answer» What resistor should be connected in parallel with the $20 Ω$ resistor in branch $ADC$ in the circuit shown in figure, so that potential difference between $B$ and $D$ may be zero ?

Discussion

2777.	an ice cube contains a large air bubble. the cube is floating on the horizontal surface of water contained in a trough. what will happen to the water level when ce cube melts
Answer» an ice cube contains a large air bubble. the cube is floating on the horizontal surface of water contained in a trough. what will happen to the water level when ce cube melts

Discussion

2778.	A jet of liquid of cross sectional area a strikes a wall making angle θ with the wall.The water strikes with thw wall wirh velocity v and rebounds elastically.If density of liquid be ρ, tthe normal force on the wall is=?
Answer» A jet of liquid of cross sectional area a strikes a wall making angle θ with the wall.The water strikes with thw wall wirh velocity v and rebounds elastically.If density of liquid be ρ, tthe normal force on the wall is=?

Discussion

2779.	When a drum is beaten, a sound is heard due to:
Answer» When a drum is beaten, a sound is heard due to:

Discussion

2780.	A balloon of weight w is falling vertically downwards with a constant acceleration a(< g). The magnitude of the air resistance is
Answer» A balloon of weight w is falling vertically downwards with a constant acceleration a(< g). The magnitude of the air resistance is

Discussion

2781.	The various steps in the food chain are called____.
Answer» The various steps in the food chain are called____.

Discussion

2782.	A partical moves along the parabolic path y=2x -x^2 +2 in such a way that the x-component of velocity vector remains cons†an t (5m/s). Find the magnitude of acceleration of the particle.
Answer» A partical moves along the parabolic path y=2x -x^2 +2 in such a way that the x-component of velocity vector remains cons†an t (5m/s). Find the magnitude of acceleration of the particle.

Discussion

2783.	The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coincides with a main scale division. Find:(i) least count and (ii) radius of cylinder.
Answer» The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and 4th division of vernier scale coincides with a main scale division. Find:(i) least count and (ii) radius of cylinder.

Discussion

2784.	How much deep inside the earth should a man go so that his weight becomes one fourth of that at a point which is at a height R above the surface of the earth ?1. R/4 2. 15R/163. 3R/4 4. R/2
Answer» How much deep inside the earth should a man go so that his weight becomes one fourth of that at a point which is at a height R above the surface of the earth ? 1. R/4 2. 15R/16 3. 3R/4 4. R/2

Discussion

2785.	Inertia of a body has direct dependence on __
Answer» Inertia of a body has direct dependence on __

Discussion

2786.	Water is flowing with a speed of 2 m/s in a horizontal pipe with cross sectional area 2/100 sq. m at pressure 40000 Pa. What will be the pressure at a smaller cross section where the area decreases to 0.01 sq.m.
Answer» Water is flowing with a speed of 2 m/s in a horizontal pipe with cross sectional area 2/100 sq. m at pressure 40000 Pa. What will be the pressure at a smaller cross section where the area decreases to 0.01 sq.m.

Discussion

2787.	A boy weighs 600 N on the Earth. What would be his weight on the moon?
Answer» A boy weighs $600 N$ on the Earth. What would be his weight on the moon?

Discussion

2788.	Question 4A pair of bullocks exert a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Answer» Question 4 A pair of bullocks exert a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

Discussion

2789.	If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is :-
Answer» If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is :-

Discussion

2790.	A man weighs 600 N on the earth. If he was taken to the moon, his weight would be 100 N. What is the acceleration due to gravity on the moon? (Take g=10 ms−2)
Answer» A man weighs 600 N on the earth. If he was taken to the moon, his weight would be 100 N. What is the acceleration due to gravity on the moon? (Take $g = 10 m s^{- 2}$ )

Discussion

2791.	Identify the correct sequence of events that take place when an external force acts on a block (at rest) kept on a rough surface.A. The block starts moving.B. Static friction starts acting on the block.C. Kinetic friction acts on the block.D. The block continues to be stationary.
Answer» Identify the correct sequence of events that take place when an external force acts on a block (at rest) kept on a rough surface. A. The block starts moving. B. Static friction starts acting on the block. C. Kinetic friction acts on the block. D. The block continues to be stationary.

Discussion

2792.	The outer case of the bell in a temple is made big. Give a reason.
Answer» The outer case of the bell in a temple is made big. Give a reason.

Discussion

2793.	Inertia is
Answer» Inertia is

Discussion

2794.	Determine the electric field strength vector if the potential of this fielddepends on x, y coordinates as p=a(xy),where a is a constant. Draw the approximate shape of these field(in the x, y plane
Answer» Determine the electric field strength vector if the potential of this fielddepends on x, y coordinates as p=a(xy),where a is a constant. Draw the approximate shape of these field(in the x, y plane

Discussion

2795.	a water †an k is 20m deep if the water barometer reads 10m at that place then what is the pressure at the bottom of the †an k in atmosphere
Answer» a water †an k is 20m deep if the water barometer reads 10m at that place then what is the pressure at the bottom of the †an k in atmosphere

Discussion

2796.	A particle has two equao accelerations in two given directions.If one of the acceleration is halved ,then the angle which the resul†an r makes with the other is also halved.What is the angle between the accelerations
Answer» A particle has two equao accelerations in two given directions.If one of the acceleration is halved ,then the angle which the resul†an r makes with the other is also halved.What is the angle between the accelerations

Discussion

2797.	An egg just sinks when it is dropped in a container filled with water. If common salt is added to the water, then what will happen to the egg?
Answer» An egg just sinks when it is dropped in a container filled with water. If common salt is added to the water, then what will happen to the egg?

Discussion

2798.	if acceleration a=4-4t/2,then find average acceleration for t=1 to 2 sec
Answer» if acceleration a=4-4t/2,then find average acceleration for t=1 to 2 sec

Discussion

2799.	37.When an object is placed at distances x1 and x2 from the poles of a concave mirror, images of same magnification are produced. What is the magnitude of the focal length of the mirror?
Answer» 37.When an object is placed at distances x1 and x2 from the poles of a concave mirror, images of same magnification are produced. What is the magnitude of the focal length of the mirror?

Discussion

2800.	Why is the sky blue
Answer» Why is the sky blue

Discussion

Explore topic-wise InterviewSolutions in .

eqivalent weight of water is

Which is the most commonly used fuel in thermal power plants?

‘Bicker’ means ‘to quarrel’. Why does the poet use this word here?

The differential pressure transmitter of a flow meter using orifice reads 50 kg/m2 for a particular flow rate. If the flow rate is quartered (within the range of orifice), the corresponding reading of differential pressure transmitter across orifice in kg/m2 is _________?3.125

A ball moving on a table top eventually stops. Explain the reason.

a person enters into a circular path of a radius r and moves on a circular path for t minutes and reaches the starting point. the angular displacement of the person is (i) Zero(ii) 2 pi(iii)pi(iv)2 r

If three balls of same radius are placed touching each other on a horizontal surface such that they will form an equilateral triangle, when their centers are joined. What will be the position of the centre of mass of the system?

Which of the following is not a valid displacement-time graph of an object in motion?

velocity of sound in water depends upon bulk of modulus of water (B) and density of water.find the formula of it by dimensional analysi

What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?

Which of these is a convex mirror?

Position of a particle with respect to time is x=(3m/s)t-(1m/s^2) t^2. Find the speed of particle when t=2s.

Calculate the resistance of 1 km long copper wire of radius 1 mm. (Take specific resistance of copper =1.72×10−8 Ωm)

When 92U235 undergoes fission. 0.1% of its original mass is changed into energy. 9×10xJ of energy is released if 1 kg of 92U235 undergoes fission. Value of x = ___

3.The area of cross section of the wider tube is 800cm2 .If a mass of 16kg is placed on the massless piston ,find the difference in the levels of water in the two tubes.

When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is ___%. ___

a telescope with objective of foval length 60cm and eye piece of focal length 5vm is focused on a far dis†an ce object such that the parallel rays emerge from eye piece. if object subtends an angle 2 on objective then angular width of image i

A ladder 5cm long leaning against a wall.The bottom of the ladder is pulled along the ground,away from the wall,at the rate of 2cm/s.How fast is its height on the wall decreasing when the foot of the lader is 4m away from the wall?

a rec†an gular †an k of base area 100m2 has height of 2m calculate the thrust at the bottom of the †an k if it is filled upto birm with water of density 10^3kh m^-

How does satellites work.

An object is placed at a distance of 20 cm from a convex mirror of focal length 15 cm. Find the position and nature of the image.

Question 03.4 Mention in the following case whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer.Marble floor with water spread over it

If λ is the wavelength of incident radiation of intensity I, calculate no. of photons incident per second on an area A.

What resistor should be connected in parallel with the 20 Ω resistor in branch ADC in the circuit shown in figure, so that potential difference between B and D may be zero ?

an ice cube contains a large air bubble. the cube is floating on the horizontal surface of water contained in a trough. what will happen to the water level when ce cube melts

A jet of liquid of cross sectional area a strikes a wall making angle θ with the wall.The water strikes with thw wall wirh velocity v and rebounds elastically.If density of liquid be ρ, tthe normal force on the wall is=?

When a drum is beaten, a sound is heard due to:

A balloon of weight w is falling vertically downwards with a constant acceleration a(&lt; g). The magnitude of the air resistance is

The various steps in the food chain are called____.

A partical moves along the parabolic path y=2x -x^2 +2 in such a way that the x-component of velocity vector remains cons†an t (5m/s). Find the magnitude of acceleration of the particle.

How much deep inside the earth should a man go so that his weight becomes one fourth of that at a point which is at a height R above the surface of the earth ?1. R/4 2. 15R/163. 3R/4 4. R/2

Inertia of a body has direct dependence on __

Water is flowing with a speed of 2 m/s in a horizontal pipe with cross sectional area 2/100 sq. m at pressure 40000 Pa. What will be the pressure at a smaller cross section where the area decreases to 0.01 sq.m.

A boy weighs 600 N on the Earth. What would be his weight on the moon?

Question 4A pair of bullocks exert a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?

If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is :-

A man weighs 600 N on the earth. If he was taken to the moon, his weight would be 100 N. What is the acceleration due to gravity on the moon? (Take g=10 ms−2)

Identify the correct sequence of events that take place when an external force acts on a block (at rest) kept on a rough surface.A. The block starts moving.B. Static friction starts acting on the block.C. Kinetic friction acts on the block.D. The block continues to be stationary.

The outer case of the bell in a temple is made big. Give a reason.

Inertia is

Determine the electric field strength vector if the potential of this fielddepends on x, y coordinates as p=a(xy),where a is a constant. Draw the approximate shape of these field(in the x, y plane

a water †an k is 20m deep if the water barometer reads 10m at that place then what is the pressure at the bottom of the †an k in atmosphere

A particle has two equao accelerations in two given directions.If one of the acceleration is halved ,then the angle which the resul†an r makes with the other is also halved.What is the angle between the accelerations

An egg just sinks when it is dropped in a container filled with water. If common salt is added to the water, then what will happen to the egg?

if acceleration a=4-4t/2,then find average acceleration for t=1 to 2 sec

37.When an object is placed at distances x1 and x2 from the poles of a concave mirror, images of same magnification are produced. What is the magnitude of the focal length of the mirror?

Why is the sky blue

When kinetic energy of a body increased by 200%. The percentage change in momentum of the body is _%. _

A balloon of weight w is falling vertically downwards with a constant acceleration a(< g). The magnitude of the air resistance is