13232 + Interview Questions in Physics

1.	8.A body weighs 81 kg wt. on the surface of earth. How much will it weigh on the surface of the mars (mass of the mars = 1/9th mass of the earth, radius of the mars = 1/2 radius of the earth) Options: 36 kg wt 20 kg wt 80 kg wt 10 kg wt
Answer» 8.A body weighs 81 kg wt. on the surface of earth. How much will it weigh on the surface of the mars (mass of the mars = 1/9th mass of the earth, radius of the mars = 1/2 radius of the earth) Options: 36 kg wt 20 kg wt 80 kg wt 10 kg wt

Discussion

2.	Draw a displacement- distance graph of a wave and mark on it, the amplitude of wave by the letter a and wavelength of wave by the letter λ.
Answer» Draw a displacement- distance graph of a wave and mark on it, the amplitude of wave by the letter a and wavelength of wave by the letter $λ$ .

Discussion

3.	What is The mimimum distance of echo to be produced
Answer» What is The mimimum distance of echo to be produced

Discussion

4.	A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a r2 . If v1 and v2 are the linear velocity at these points respectively. then the ratio of v1 and v2 is (1)(r1/r2)(2)(r1/r2)^2(3)(r2/r1)(4)(r2/r1)^2
Answer» A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a r2 . If v1 and v2 are the linear velocity at these points respectively. then the ratio of v1 and v2 is (1)(r1/r2) (2)(r1/r2)^2 (3)(r2/r1) (4)(r2/r1)^2

Discussion

5.	Time-velocity graph of a particle is shown in fig. Find its instantaneous acceleration at following intervals :(i) at t = 3s(ii) at t = 6s(iii) at t = 9s
Answer» Time-velocity graph of a particle is shown in fig. Find its instantaneous acceleration at following intervals : (i) at t = 3s (ii) at t = 6s (iii) at t = 9s

5.

Time-velocity graph of a particle is shown in fig. Find its instantaneous acceleration at following intervals :(i) at t = 3s(ii) at t = 6s(iii) at t = 9s

Answer»

Time-velocity graph of a particle is shown in fig. Find its instantaneous acceleration at following intervals :

(i) at t = 3s

(ii) at t = 6s

(iii) at t = 9s

Discussion

6.	A viscous liquid ρ=1.2×103kg/m3,μ=0.0048Pa.s flows at a rate of 10 ml/s through a horizontal, 4 mm diameter tube. The pressure drop along a 1 m length of the tube which is far from the tube entrance so that the flow is fully developed is _____(kPa)7.64
Answer» A viscous liquid $ρ = 1.2 \times 10^{3} k g / m^{3}, μ = 0.0048 P a . s$ flows at a rate of 10 ml/s through a horizontal, 4 mm diameter tube. The pressure drop along a 1 m length of the tube which is far from the tube entrance so that the flow is fully developed is _____(kPa) 7.64

Discussion

7.	Question 71(v)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.When cyclist II reached town A, how far was cyclist I from town B?
Answer» Question 71(v) The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A. When cyclist II reached town A, how far was cyclist I from town B?

Discussion

8.	a particle of mass 4 kg moving with a speed of 10 m/s collides with a train moving in an opposite direction with a speed of 20 m/s. If coefficient of restitution e = 0.5 calculate final speed of particle in m/s
Answer» a particle of mass 4 kg moving with a speed of 10 m/s collides with a train moving in an opposite direction with a speed of 20 m/s. If coefficient of restitution e = 0.5 calculate final speed of particle in m/s

Discussion

9.	Why the object like aeroplane ,helicopter ,birds and those things that fly in the sky not attract by gravitational force?
Answer» Why the object like aeroplane ,helicopter ,birds and those things that fly in the sky not attract by gravitational force?

Discussion

10.	(a) What is the frequency range of hearing in humans? (b) Which of the following sound frequencies cannot be heard by a human ear? (i) 10 Hz (ii) 100 Hz (iii) 10,000 Hz (iv) 15 Hz (v) 40,000 Hz
Answer» (a) What is the frequency range of hearing in humans? (b) Which of the following sound frequencies cannot be heard by a human ear? (i) 10 Hz (ii) 100 Hz (iii) 10,000 Hz (iv) 15 Hz (v) 40,000 Hz

10.

(a) What is the frequency range of hearing in humans? (b) Which of the following sound frequencies cannot be heard by a human ear? (i) 10 Hz (ii) 100 Hz (iii) 10,000 Hz (iv) 15 Hz (v) 40,000 Hz

Answer»

(a) What is the frequency range of hearing in humans?

(b) Which of the following sound frequencies cannot be heard by a human ear?

(i) 10 Hz

(ii) 100 Hz

(iii) 10,000 Hz

(iv) 15 Hz

(v) 40,000 Hz

Discussion

11.	The mass of a neutral carbon atom, a specimen of the most common isotope, in ground state is:
Answer» The mass of a neutral carbon atom, a specimen of the most common isotope, in ground state is:

Discussion

12.	10.if the componentsof a force are p along east and p along north directions then the force is
Answer» 10.if the componentsof a force are p along east and p along north directions then the force is

Discussion

13.	(3) 7X10INAgiven light of wave length of 600 nm, wave lengthwidth is 0.2 nm. Find frequency width?(1) 25 x 101" Hz(3) 15 x 106 Hz44.(2) 5 × 107 Hz(4) 1.67 × 1011 Hz
Answer» (3) 7X10INAgiven light of wave length of 600 nm, wave lengthwidth is 0.2 nm. Find frequency width?(1) 25 x 101" Hz(3) 15 x 106 Hz44.(2) 5 × 107 Hz(4) 1.67 × 1011 Hz

Discussion

14.	The mass of the earth is 6 × 1024 kg and that of the moon is 7.4 ×1022 kg. If the distance between the earth and the moon be 3.84 × 105 km, calculate the force exerted by the earth on the moon. (G = 6.7 × 10−11 Nm2 kg−2)
Answer» The mass of the earth is 6 × 10²⁴ kg and that of the moon is 7.4 ×10²² kg. If the distance between the earth and the moon be 3.84 × 10⁵ km, calculate the force exerted by the earth on the moon. (G = 6.7 × 10⁻¹¹ Nm² kg⁻²)

Discussion

15.	Question 7A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms−2, with what velocity will it strike the ground? After what time will it strike the ground?
Answer» Question 7 A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 $m s^{- 2}$ , with what velocity will it strike the ground? After what time will it strike the ground?

Discussion

16.	69.The nesrest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallex would this star (Alpha Centauri) show when viewed from two location on Earth six months apart in its orbit around the sun?
Answer» 69.The nesrest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallex would this star (Alpha Centauri) show when viewed from two location on Earth six months apart in its orbit around the sun?

Discussion

17.	A plane mirror is placed at the bottom of the tank containing a liquid of refractive index μ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be
Answer» A plane mirror is placed at the bottom of the tank containing a liquid of refractive index $μ$ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be

Discussion

18.	How is water drawn up from a well by a water pump ?
Answer» How is water drawn up from a well by a water pump ?

Discussion

19.	A car of mass 1000 kg accelerated uniformly from rest to a velocity of 54 km/h in 5 s. Find the average power of the engine during this period.
Answer» A car of mass 1000 kg accelerated uniformly from rest to a velocity of 54 km/h in 5 s. Find the average power of the engine during this period.

Discussion

20.	A piece of ice (heat capacity =2100 J kg–1∘C–1 and latent heat =3.36×105 J kg–1) of mass m grams is at –5∘C at atmospheric pressure. It is given 420 J of heat so that the ice starts melting. Finally, when theice-water mixture is in equilibrium, it is found that 1 gm of ice has melted. Assuming there is no other heat exchange in the process, the value of m is
Answer» A piece of ice (heat capacity $= 2100 J k g^{- 1}$ $^{\circ} C - 1$ and latent heat $= 3.36 \times 10^{5} J k g^{- 1}$ ) of mass m grams is at $- 5^{\circ} C$ at atmospheric pressure. It is given $420 J$ of heat so that the ice starts melting. Finally, when theice-water mixture is in equilibrium, it is found that $1 g m$ of ice has melted. Assuming there is no other heat exchange in the process, the value of $m$ is

Discussion

21.	A ball is gently dropped from a height of 20 m. If it's velocity increases uniformly at the rate of 10 m/s², with what velocity will it strike the ground? After what time will it strike the ground?
Answer» A ball is gently dropped from a height of 20 m. If it's velocity increases uniformly at the rate of 10 m/s², with what velocity will it strike the ground? After what time will it strike the ground?

Discussion

22.	28. Calculate wavelength of O2 molecule if it's velocity is 1÷ 10 of speed of light
Answer» 28. Calculate wavelength of O2 molecule if it's velocity is 1÷ 10 of speed of light

Discussion

23.	In an uniform circular motion which of the following quantity remains constant?
Answer» In an uniform circular motion which of the following quantity remains constant?

Discussion

24.	Which of the following mirrors has the highest field of view?
Answer» Which of the following mirrors has the highest field of view?

Discussion

25.	When a particle is thrown verticaly upwards, its velocity at one third of its maximum height is 10\sqrt2 m/s. The maximum height attained by it is (1) 20\sqrt{} m (3) 15 m (2) 30 m (4) 12.8 m
Answer» When a particle is thrown verticaly upwards, its velocity at one third of its maximum height is 10\sqrt2 m/s. The maximum height attained by it is (1) 20\sqrt{} m (3) 15 m (2) 30 m (4) 12.8 m

Discussion

26.	A car moving towards east east velocity 10m/s suddenly changes direction towards north without changing speed in 2 seconds. Find it's acceleration.
Answer» A car moving towards east east velocity 10m/s suddenly changes direction towards north without changing speed in 2 seconds. Find it's acceleration.

Discussion

27.	what is the unit of G=?
Answer» what is the unit of G=?

Discussion

28.	A child is swinging on a swing in sitting position. Ifhe stands up, then the time period of the swing will A.Increase В.Decrease C Remain same D. Increase if the child is tall and decrease if the child is short
Answer» A child is swinging on a swing in sitting position. Ifhe stands up, then the time period of the swing will A.Increase В.Decrease C Remain same D. Increase if the child is tall and decrease if the child is short

Discussion

29.	State three uses of a concave mirror
Answer» State three uses of a concave mirror

Discussion

30.	25 What is the ignition mixture for thermite treatment taken?
Answer» 25 What is the ignition mixture for thermite treatment taken?

Discussion

31.	What is the numerical value of gravitational constant?
Answer» What is the numerical value of gravitational constant?

Discussion

32.	A particle of charge q and velocity v passes undeflected through a space with non-zero electric field E and magnetic field B . The undeflecting condition will hold if. (1)sign of both q and E are reversed (2)sign of both q and B are reversed (3) both B and E are changed in magnitude, but keeping the products of B and E fixed (4) both B and E are doubled in magnitude
Answer» A particle of charge q and velocity v passes undeflected through a space with non-zero electric field E and magnetic field B . The undeflecting condition will hold if. (1)sign of both q and E are reversed (2)sign of both q and B are reversed (3) both B and E are changed in magnitude, but keeping the products of B and E fixed (4) both B and E are doubled in magnitude

Discussion

33.	How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave ?
Answer» How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave ?

Discussion

34.	We need warm clothes even in summer in Shimla but not in Mumbai.
Answer» We need warm clothes even in summer in Shimla but not in Mumbai.

Discussion

35.	A cubic vessel contains ideal gas at NTP.The vessel is being carried by a rocket accelerating in the upward direction with respect to observer on ground.The pressure of gas inside the vessel as observed by A)Observer on ground and observer on rocket will be different for top wall and bottom wall of vesselB)observer on rocket will be different for top wall and bottom wall of vesselC)Observer on ground will be different for top wall and bottom wall of vesselD)Will always be same for both faces
Answer» A cubic vessel contains ideal gas at NTP.The vessel is being carried by a rocket accelerating in the upward direction with respect to observer on ground.The pressure of gas inside the vessel as observed by A)Observer on ground and observer on rocket will be different for top wall and bottom wall of vessel B)observer on rocket will be different for top wall and bottom wall of vessel C)Observer on ground will be different for top wall and bottom wall of vessel D)Will always be same for both faces

Discussion

36.	Why don't we get attracted towards the huge mountains?
Answer» Why don't we get attracted towards the huge mountains?

Discussion

37.	Two cars A and B moving in opposite direction along a straight road with constant velocities of 20 m/s and 40 m/s respectively. Velocity of B with respect to A is
Answer» Two cars $A$ and $B$ moving in opposite direction along a straight road with constant velocities of $20 m/s$ and $40 m/s$ respectively. Velocity of $B$ with respect to $A$ is

Discussion

38.	Explain the construction and working of a hydrometer with diagram.
Answer» Explain the construction and working of a hydrometer with diagram.

Discussion

39.	Why don't we get crushed because of atmospheric pressure?
Answer» Why don't we get crushed because of atmospheric pressure?

Discussion

40.	The time constant of the given circuit is-
Answer» The time constant of the given circuit is-

Discussion

41.	What is curvature and what is the importance of of focal length?
Answer» What is curvature and what is the importance of of focal length?

Discussion

42.	___ Pa is the pressure at a depth of 9m below the surface of the water tank. The density of water is 1000kgm3
Answer» ___ $P a$ is the pressure at a depth of $9 m$ below the surface of the water tank. The density of water is $1000 \frac{k g}{m^{3}}$

Discussion

43.	The least count of a screw gauge can be decreased by:
Answer» The least count of a screw gauge can be decreased by:

Discussion

44.	An observer standing between 2 cliffs heard 2 successive echoes at 2 seconds and 3 seconds. Calculate the distance between the two cliffs if speed of sound in air is 340 m/s.
Answer» An observer standing between 2 cliffs heard 2 successive echoes at 2 seconds and 3 seconds. Calculate the distance between the two cliffs if speed of sound in air is 340 m/s.

Discussion

45.	ntThe electric resistance of a certain wire of resistance R ,if its length and radius are both doubled then the resistance will be?n ntExplain in detailn
Answer» ntThe electric resistance of a certain wire of resistance R ,if its length and radius are both doubled then the resistance will be?n ntExplain in detailn

Discussion

46.	Question 20 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.
Answer» Question 20 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.

Discussion

47.	A ray through the Centre of Curvature hitting a spherical mirror makes an angle of __________ with the normal.
Answer» A ray through the Centre of Curvature hitting a spherical mirror makes an angle of __________ with the normal.

Discussion

48.	What is a soundboard? Explain the working of a soundboard with the help of a labelled diagram.
Answer» What is a soundboard? Explain the working of a soundboard with the help of a labelled diagram.

Discussion

49.	An aeroplane flying horizontally with a velocity of216 km h-1, drops a food packet while flying at aheight of 980 m. The total horizontal distancetravelled by the packet is (g = 9.8 m/s2)(1) 600 m(2) 600/2 m(4) 432 2 m(3) 216 m
Answer» An aeroplane flying horizontally with a velocity of216 km h-1, drops a food packet while flying at aheight of 980 m. The total horizontal distancetravelled by the packet is (g = 9.8 m/s2)(1) 600 m(2) 600/2 m(4) 432 2 m(3) 216 m

Discussion

50.	How does a generator work?
Answer» How does a generator work?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

8.A body weighs 81 kg wt. on the surface of earth. How much will it weigh on the surface of the mars (mass of the mars = 1/9th mass of the earth, radius of the mars = 1/2 radius of the earth) Options: 36 kg wt 20 kg wt 80 kg wt 10 kg wt

Draw a displacement- distance graph of a wave and mark on it, the amplitude of wave by the letter a and wavelength of wave by the letter λ.

What is The mimimum distance of echo to be produced

A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a r2 . If v1 and v2 are the linear velocity at these points respectively. then the ratio of v1 and v2 is (1)(r1/r2)(2)(r1/r2)^2(3)(r2/r1)(4)(r2/r1)^2

Time-velocity graph of a particle is shown in fig. Find its instantaneous acceleration at following intervals :(i) at t = 3s(ii) at t = 6s(iii) at t = 9s

A viscous liquid ρ=1.2×103kg/m3,μ=0.0048Pa.s flows at a rate of 10 ml/s through a horizontal, 4 mm diameter tube. The pressure drop along a 1 m length of the tube which is far from the tube entrance so that the flow is fully developed is _____(kPa)7.64

Question 71(v)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.When cyclist II reached town A, how far was cyclist I from town B?

a particle of mass 4 kg moving with a speed of 10 m/s collides with a train moving in an opposite direction with a speed of 20 m/s. If coefficient of restitution e = 0.5 calculate final speed of particle in m/s

Why the object like aeroplane ,helicopter ,birds and those things that fly in the sky not attract by gravitational force?

(a) What is the frequency range of hearing in humans? (b) Which of the following sound frequencies cannot be heard by a human ear? (i) 10 Hz (ii) 100 Hz (iii) 10,000 Hz (iv) 15 Hz (v) 40,000 Hz

The mass of a neutral carbon atom, a specimen of the most common isotope, in ground state is:

10.if the componentsof a force are p along east and p along north directions then the force is

(3) 7X10INAgiven light of wave length of 600 nm, wave lengthwidth is 0.2 nm. Find frequency width?(1) 25 x 101" Hz(3) 15 x 106 Hz44.(2) 5 × 107 Hz(4) 1.67 × 1011 Hz

The mass of the earth is 6 × 1024 kg and that of the moon is 7.4 ×1022 kg. If the distance between the earth and the moon be 3.84 × 105 km, calculate the force exerted by the earth on the moon. (G = 6.7 × 10−11 Nm2 kg−2​)

Question 7A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms−2, with what velocity will it strike the ground? After what time will it strike the ground?

69.The nesrest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallex would this star (Alpha Centauri) show when viewed from two location on Earth six months apart in its orbit around the sun?

A plane mirror is placed at the bottom of the tank containing a liquid of refractive index μ . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be

How is water drawn up from a well by a water pump ?

A car of mass 1000 kg accelerated uniformly from rest to a velocity of 54 km/h in 5 s. Find the average power of the engine during this period.

A ball is gently dropped from a height of 20 m. If it's velocity increases uniformly at the rate of 10 m/s², with what velocity will it strike the ground? After what time will it strike the ground?

28. Calculate wavelength of O2 molecule if it's velocity is 1÷ 10 of speed of light

In an uniform circular motion which of the following quantity remains constant?

Which of the following mirrors has the highest field of view?

When a particle is thrown verticaly upwards, its velocity at one third of its maximum height is 10\sqrt2 m/s. The maximum height attained by it is (1) 20\sqrt{} m (3) 15 m (2) 30 m (4) 12.8 m

A car moving towards east east velocity 10m/s suddenly changes direction towards north without changing speed in 2 seconds. Find it's acceleration.

what is the unit of G=?

A child is swinging on a swing in sitting position. Ifhe stands up, then the time period of the swing will A.Increase В.Decrease C Remain same D. Increase if the child is tall and decrease if the child is short

State three uses of a concave mirror

25 What is the ignition mixture for thermite treatment taken?

What is the numerical value of gravitational constant?

How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave ?

We need warm clothes even in summer in Shimla but not in Mumbai.

Why don't we get attracted towards the huge mountains?

Two cars A and B moving in opposite direction along a straight road with constant velocities of 20 m/s and 40 m/s respectively. Velocity of B with respect to A is

Explain the construction and working of a hydrometer with diagram.

Why don't we get crushed because of atmospheric pressure?

The time constant of the given circuit is-

What is curvature and what is the importance of of focal length?

___ Pa is the pressure at a depth of 9m below the surface of the water tank. The density of water is 1000kgm3

The least count of a screw gauge can be decreased by:

An observer standing between 2 cliffs heard 2 successive echoes at 2 seconds and 3 seconds. Calculate the distance between the two cliffs if speed of sound in air is 340 m/s.

ntThe electric resistance of a certain wire of resistance R ,if its length and radius are both doubled then the resistance will be?n ntExplain in detailn

Question 20 Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.

A ray through the Centre of Curvature hitting a spherical mirror makes an angle of __________ with the normal.

What is a soundboard? Explain the working of a soundboard with the help of a labelled diagram.

An aeroplane flying horizontally with a velocity of216 km h-1, drops a food packet while flying at aheight of 980 m. The total horizontal distancetravelled by the packet is (g = 9.8 m/s2)(1) 600 m(2) 600/2 m(4) 432 2 m(3) 216 m

How does a generator work?

The mass of the earth is 6 × 1024 kg and that of the moon is 7.4 ×1022 kg. If the distance between the earth and the moon be 3.84 × 105 km, calculate the force exerted by the earth on the moon. (G = 6.7 × 10−11 Nm2 kg−2)