13232 + Interview Questions in Physics Page 204 InterviewSolution

10151.	What is the unit of refractive index?
Answer» What is the unit of refractive index?

Discussion

10152.	What would happen to earth, if sun suddenly vanishes? (Neglect the gravitational force due to other planets)
Answer» What would happen to earth, if sun suddenly vanishes? (Neglect the gravitational force due to other planets)

Discussion

10153.	What are the factors affecting the Buoyant Force?
Answer» What are the factors affecting the Buoyant Force?

Discussion

10154.	An iron rod of length 50 cm is joined at an end to an aluminum rod of length 100cm. All measurement refer to 20∘C. Find the length of the composite system at 100∘C and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminum are 12×10−6/∘C and 24×10−6/∘C respectively.
Answer» An iron rod of length 50 cm is joined at an end to an aluminum rod of length 100cm. All measurement refer to $20^{\circ} C$ . Find the length of the composite system at $100^{\circ} C$ and its average coefficient of linear expansion. The coefficient of linear expansion of iron and aluminum are $12 \times 10^{- 6} /^{\circ} C$ and $24 \times 10^{- 6} /^{\circ} C$ respectively.

Discussion

10155.	Define the term energy.
Answer» Define the term energy.

Discussion

10156.	A man fires a gun towards a hill and hears its echo after 5 seconds. He then moves 310 m towards the hill and fires his gun again. This time he hears the echo after 3 seconds. Calculate the velocity of sound.
Answer» A man fires a gun towards a hill and hears its echo after 5 seconds. He then moves 310 m towards the hill and fires his gun again. This time he hears the echo after 3 seconds. Calculate the velocity of sound.

Discussion

10157.	What is meant by least count? How can we calculate it?
Answer» What is meant by least count? How can we calculate it?

Discussion

10158.	______________ of a two particle system depends only on the separation between two particles.
Answer» ______________ of a two particle system depends only on the separation between two particles.

Discussion

10159.	A force of 20 N acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is its acceleration ? (g=9.8ms−2)
Answer» A force of 20 N acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is its acceleration ? $(g = 9.8 m s^{- 2})$

Discussion

10160.	A trolley is moving with a velocity of 20 meter per second. The mass of the trolley 100.8 kg and Apple mass of 0.2 kg is moving with a velocity of 5 km/s. The apple falls on the trolley. What is the final velocity of apple trolley together?
Answer» A trolley is moving with a velocity of 20 meter per second. The mass of the trolley 100.8 kg and Apple mass of 0.2 kg is moving with a velocity of 5 km/s. The apple falls on the trolley. What is the final velocity of apple trolley together?

Discussion

10161.	Why are road accidents at high speeds very much worse than road accidents at low speeds ?
Answer» Why are road accidents at high speeds very much worse than road accidents at low speeds ?

Discussion

10162.	In an energy pyramid, the lowest level has
Answer» In an energy pyramid, the lowest level has

10162.

In an energy pyramid, the lowest level has

Answer»

In an energy pyramid, the lowest level has

Discussion

10163.	We all know that a kite is basically a sheet of thin paper stretched on a wooden frame. Ram had one such kite as shown in the figure below. Unfortunately the central wooden stick (ROT) broke. What length of wood would he require to replace it?
Answer» We all know that a kite is basically a sheet of thin paper stretched on a wooden frame. Ram had one such kite as shown in the figure below. Unfortunately the central wooden stick (ROT) broke. What length of wood would he require to replace it?

10163.

We all know that a kite is basically a sheet of thin paper stretched on a wooden frame. Ram had one such kite as shown in the figure below. Unfortunately the central wooden stick (ROT) broke. What length of wood would he require to replace it?

Answer»

We all know that a kite is basically a sheet of thin paper stretched on a wooden frame. Ram had one such kite as shown in the figure below. Unfortunately the central wooden stick (ROT) broke. What length of wood would he require to replace it?

Discussion

10164.	A bullet moving with a velocity of 100m/s strikes a wooden block and comes to rest after penetrating a distance of 2cm .calulate retadatation caused by wooden block.
Answer» A bullet moving with a velocity of 100m/s strikes a wooden block and comes to rest after penetrating a distance of 2cm .calulate retadatation caused by wooden block.

Discussion

10165.	How many electrons constitute a charge of 1 coulomb?
Answer» How many electrons constitute a charge of 1 coulomb?

Discussion

10166.	Calculate the change in momentum of a car of mass 1000kg when it s speed increases from 36 km/hr to 108 km/hr uniformly.
Answer» Calculate the change in momentum of a car of mass 1000kg when it s speed increases from 36 km/hr to 108 km/hr uniformly.

Discussion

10167.	An empty container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there, then
Answer» An empty container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there, then

Discussion

10168.	Question 3 In case of negative work in the angle between the force and displacement is (a) 0∘ (b) 45∘ (c) 90∘ (d) 180∘
Answer» Question 3 In case of negative work in the angle between the force and displacement is (a) $0^{\circ}$ (b) $45^{\circ}$ (c) $90^{\circ}$ (d) $180^{\circ}$

Discussion

10169.	Define 1 watt.
Answer» Define 1 watt.

Discussion

10170.	A ray of light is reflected by the pole of a concave mirror at an angle of 80o. The angle of incidence will be.
Answer» A ray of light is reflected by the pole of a concave mirror at an angle of 80^o. The angle of incidence will be.

Discussion

10171.	18 kmh−1 is equal to : (a)10 m s−1 (b)5 m s−1 (c)18 m s−1 (d)1.8 m s−1
Answer» 18 km $h^{- 1}$ is equal to : (a) $10 m s^{- 1}$ (b) $5 m s^{- 1}$ (c) $18 m s^{- 1}$ (d) $1.8 m s^{- 1}$

10171.

18 kmh−1 is equal to : (a)10 m s−1 (b)5 m s−1 (c)18 m s−1 (d)1.8 m s−1

Answer»

18 km $h^{- 1}$ is equal to :

(a) $10 m s^{- 1}$ (b) $5 m s^{- 1}$

(c) $18 m s^{- 1}$ (d) $1.8 m s^{- 1}$

Discussion

10172.	A car of mass 480 kg moving at a speed of 54 km h−1 is stopped by applying brakes in 10 s. Calculte the force applied by the brakes.
Answer» A car of mass 480 kg moving at a speed of 54 km $h^{- 1}$ is stopped by applying brakes in 10 s. Calculte the force applied by the brakes.

Discussion

10173.	An auto travels the first half time with a uniform speed u and the next half time with a uniform speed v. Find its average speed.
Answer» An auto travels the first half time with a uniform speed $u$ and the next half time with a uniform speed $v$ . Find its average speed.

Discussion

10174.	An iron sphere of mass 5 kg has the same diameter as an aluminium sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:
Answer» An iron sphere of mass 5 kg has the same diameter as an aluminium sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

Discussion

10175.	We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called : (a) frequency (b) timbre (c) pitch (d) loudness
Answer» We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called : (a) frequency (b) timbre (c) pitch (d) loudness

10175.

We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called : (a) frequency (b) timbre (c) pitch (d) loudness

Answer»

We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called :

(a) frequency

(b) timbre

(c) pitch

(d) loudness

Discussion

10176.	The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from : (a) A to B, (b) B to C, and (c) C to D.
Answer» The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from : (a) A to B, (b) B to C, and (c) C to D.

10176.

The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from : (a) A to B, (b) B to C, and (c) C to D.

Answer»

The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from :

(a) A to B,

(b) B to C, and

(c) C to D.

Discussion

10177.	Describe how the gravitational force between two objects depends on the distance between them.
Answer» Describe how the gravitational force between two objects depends on the distance between them.

Discussion

10178.	A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground. Assume acceleration due to gravity g=10m/s2.
Answer» A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground. Assume acceleration due to gravity $g = 10 m / s^{2}$ .

Discussion

10179.	Which of these is a wind instrument?
Answer» Which of these is a wind instrument?

Discussion

10180.	A light ball falling on ground, after striking the ground rises upwards Explain the reason.
Answer» A light ball falling on ground, after striking the ground rises upwards Explain the reason.

Discussion

10181.	A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)
Answer» A person is standing at a distance of ' $d$ ' m from a wall and clapping at a rate of $4$ claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be $340 m s^{- 1}$ )

Discussion

10182.	Two point objects with different masses are kept at a distance R apart from each other. If the gravitational force between them is F, then:
Answer» Two point objects with different masses are kept at a distance $R$ apart from each other. If the gravitational force between them is $F$ , then:

Discussion

10183.	In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is:
Answer» In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is:

Discussion

10184.	Sound which is pleasant to ears is called___.
Answer» Sound which is pleasant to ears is called___.

Discussion

10185.	The pendulum used in a clock is a___pendulum.
Answer» The pendulum used in a clock is a___pendulum.

Discussion

10186.	Give one example of each type of the following motion: (a) uniform velocity (b) variable velocity (c) variable acceleration (d) uniform retardation
Answer» Give one example of each type of the following motion: (a) uniform velocity (b) variable velocity (c) variable acceleration (d) uniform retardation

10186.

Give one example of each type of the following motion: (a) uniform velocity (b) variable velocity (c) variable acceleration (d) uniform retardation

Answer»

Give one example of each type of the following motion:

(a) uniform velocity (b) variable velocity

(c) variable acceleration (d) uniform retardation

Discussion

10187.	A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)
Answer» A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be $340 m s^{- 1}$ )

Discussion

10188.	An electric heater is rated 1500W. How much unit of energy does it use in 15 hours?
Answer» An electric heater is rated 1500W. How much unit of energy does it use in 15 hours?

Discussion

10189.	Why is the motion of satellite along their planets considered an acceleration motion.
Answer» Why is the motion of satellite along their planets considered an acceleration motion.

Discussion

10190.	Explain why, a wide steel belt is provided over the wheels of an army tank.
Answer» Explain why, a wide steel belt is provided over the wheels of an army tank.

10190.

Explain why, a wide steel belt is provided over the wheels of an army tank.

Answer»

Explain why, a wide steel belt is provided over the wheels of an army tank.

Discussion

10191.	Robbers in a car travelling at 20m/s pass a policeman on a motorcycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3 m/s*2 for 12 seconds and thereafter travels at a constant velocity. Calculate the distance covered by the policeman before he overtakes the car.
Answer» Robbers in a car travelling at 20m/s pass a policeman on a motorcycle at rest. The policeman immediately starts chasing the robbers. The policeman accelerates at 3 m/s*2 for 12 seconds and thereafter travels at a constant velocity. Calculate the distance covered by the policeman before he overtakes the car.

Discussion

10192.	Your friend wants to start a business giving hot-air balloon rides. The empty balloon, the basket and the occupants have a total maximum mass of 1000 kg. If the balloon itself has a diameter of 22.0 m when fully inflated with hot air. Estimate the required density of the hot air. (Take the density of air as 1.293 kg/m3. Neglect the buoyancy force on the basket and people).
Answer» Your friend wants to start a business giving hot-air balloon rides. The empty balloon, the basket and the occupants have a total maximum mass of 1000 kg. If the balloon itself has a diameter of 22.0 m when fully inflated with hot air. Estimate the required density of the hot air. (Take the density of air as 1.293 kg/m $^{3}$ . Neglect the buoyancy force on the basket and people).

Discussion

10193.	After holding a pack of ice in your hand for some time, put your hand now in water at a normal temperature. Your hand would now feel the water to be :
Answer» After holding a pack of ice in your hand for some time, put your hand now in water at a normal temperature. Your hand would now feel the water to be :

Discussion

10194.	A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of 300 ms−1. If the cannon is free to move, the backward velocity of cannon after the bolt is fired will be:
Answer» A cannon of mass $1000 k g$ can fire a bolt of $20 k g$ with a muzzle velocity of $300 m s^{- 1}$ . If the cannon is free to move, the backward velocity of cannon after the bolt is fired will be:

Discussion

10195.	What do you mean by configuration- dependent potential energy?
Answer» What do you mean by configuration- dependent potential energy?

Discussion

10196.	What would be the weight of a body of mass 50 kg on the surface of the moon, where g = 1.6 m/s2. What would be its mass?
Answer» What would be the weight of a body of mass 50 kg on the surface of the moon, where g = 1.6 m/s². What would be its mass?

Discussion

10197.	For the graph given below choose the correct option by matching the following : Table ATable Ba) Line Ai)Accelerated Motionb) Line Bii)Constant velocity(high magnitude)c) Curve Ciii)At restd) Line Eiv)Constant Velocity(low magnitude)
Answer» For the graph given below choose the correct option by matching the following : $\begin{matrix} Table A & Table B a) Line A & i)Accelerated Motion b) Line B & ii)Constant velocity(high magnitude) c) Curve C & iii)At rest d) Line E & iv)Constant Velocity(low magnitude) \end{matrix}$

10197.

For the graph given below choose the correct option by matching the following : Table ATable Ba) Line Ai)Accelerated Motionb) Line Bii)Constant velocity(high magnitude)c) Curve Ciii)At restd) Line Eiv)Constant Velocity(low magnitude)

Answer»

For the graph given below choose the correct option by matching the following :

$\begin{matrix} Table A & Table B a) Line A & i)Accelerated Motion b) Line B & ii)Constant velocity(high magnitude) c) Curve C & iii)At rest d) Line E & iv)Constant Velocity(low magnitude) \end{matrix}$

Discussion

10198.	Suppose the angle of incidence is X0. Then angle between Shweta and Garima in terms of X0 can be represented as:
Answer» Suppose the angle of incidence is $X^{0}$ . Then angle between Shweta and Garima in terms of $X^{0}$ can be represented as:

10198.

Suppose the angle of incidence is X0. Then angle between Shweta and Garima in terms of X0 can be represented as:

Answer»

Suppose the angle of incidence is $X^{0}$ . Then angle between Shweta and Garima in terms of $X^{0}$ can be represented as:

Discussion

10199.	Suppose a body of mass 10kg is initially moving with velocity 15m/s on ground. Because of friction from ground it stops after some time. Find the work done by frictional force.
Answer» Suppose a body of mass 10kg is initially moving with velocity 15m/s on ground. Because of friction from ground it stops after some time. Find the work done by frictional force.

Discussion

10200.	What are the major hazards of a nuclear power plant?
Answer» What are the major hazards of a nuclear power plant?

Discussion

Explore topic-wise InterviewSolutions in .

What is the unit of refractive index?

What would happen to earth, if sun suddenly vanishes? (Neglect the gravitational force due to other planets)

What are the factors affecting the Buoyant Force?

Define the term energy.

A man fires a gun towards a hill and hears its echo after 5 seconds. He then moves 310 m towards the hill and fires his gun again. This time he hears the echo after 3 seconds. Calculate the velocity of sound.

What is meant by least count? How can we calculate it?

______________ of a two particle system depends only on the separation between two particles.

A force of 20 N acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is its acceleration ? (g=9.8ms−2)

A trolley is moving with a velocity of 20 meter per second. The mass of the trolley 100.8 kg and Apple mass of 0.2 kg is moving with a velocity of 5 km/s. The apple falls on the trolley. What is the final velocity of apple trolley together?

Why are road accidents at high speeds very much worse than road accidents at low speeds ?

In an energy pyramid, the lowest level has

We all know that a kite is basically a sheet of thin paper stretched on a wooden frame. Ram had one such kite as shown in the figure below. Unfortunately the central wooden stick (ROT) broke. What length of wood would he require to replace it?

A bullet moving with a velocity of 100m/s strikes a wooden block and comes to rest after penetrating a distance of 2cm .calulate retadatation caused by wooden block.

How many electrons constitute a charge of 1 coulomb?

Calculate the change in momentum of a car of mass 1000kg when it s speed increases from 36 km/hr to 108 km/hr uniformly.

An empty container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there, then

Question 3 In case of negative work in the angle between the force and displacement is (a) 0∘ (b) 45∘ (c) 90∘ (d) 180∘

Define 1 watt.

A ray of light is reflected by the pole of a concave mirror at an angle of 80o. The angle of incidence will be.

18 kmh−1 is equal to : (a)10 m s−1 (b)5 m s−1 (c)18 m s−1 (d)1.8 m s−1

A car of mass 480 kg moving at a speed of 54 km h−1 is stopped by applying brakes in 10 s. Calculte the force applied by the brakes.

An auto travels the first half time with a uniform speed u and the next half time with a uniform speed v. Find its average speed.

An iron sphere of mass 5 kg has the same diameter as an aluminium sphere of mass 4 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same:

We can distinguish between the musical sounds produced by different singers on the basis of the characteristic of sound called : (a) frequency (b) timbre (c) pitch (d) loudness

The graph given alongside shows the positions of a body at different times. Calculate the speed of the body as it moves from : (a) A to B, (b) B to C, and (c) C to D.

Describe how the gravitational force between two objects depends on the distance between them.

A fruit is dropped from a height of 20 m. Find the velocity with which it would hit the ground. Assume acceleration due to gravity g=10m/s2.

Which of these is a wind instrument?

A light ball falling on ground, after striking the ground rises upwards Explain the reason.

A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)

Two point objects with different masses are kept at a distance R apart from each other. If the gravitational force between them is F, then:

In a hydroelectric power plant, moving water is used for driving the wheels of a turbine to generate electricity. If the change in kinetic energy of turbine is 1200 J in 2 minutes then the power generated is:

Sound which is pleasant to ears is called___.

The pendulum used in a clock is a___pendulum.

Give one example of each type of the following motion: (a) uniform velocity (b) variable velocity (c) variable acceleration (d) uniform retardation

A person is standing at a distance of 'd' m from a wall and clapping at a rate of 4 claps per second. The echo of his clap coincides with his clap and he hears the echo of two claps after he stops clapping. What is 'd'? (Assume velocity of sound to be 340 ms−1)

An electric heater is rated 1500W. How much unit of energy does it use in 15 hours?

Why is the motion of satellite along their planets considered an acceleration motion.

Explain why, a wide steel belt is provided over the wheels of an army tank.

After holding a pack of ice in your hand for some time, put your hand now in water at a normal temperature. Your hand would now feel the water to be :

A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of 300 ms−1. If the cannon is free to move, the backward velocity of cannon after the bolt is fired will be:

What do you mean by configuration- dependent potential energy?

What would be the weight of a body of mass 50 kg on the surface of the moon, where g = 1.6 m/s2. What would be its mass?

For the graph given below choose the correct option by matching the following : Table ATable Ba) Line Ai)Accelerated Motionb) Line Bii)Constant velocity(high magnitude)c) Curve Ciii)At restd) Line Eiv)Constant Velocity(low magnitude)

Suppose the angle of incidence is X0. Then angle between Shweta and Garima in terms of X0 can be represented as:

Suppose a body of mass 10kg is initially moving with velocity 15m/s on ground. Because of friction from ground it stops after some time. Find the work done by frictional force.

What are the major hazards of a nuclear power plant?