13232 + Interview Questions in Physics

1.	(a) What term is used to denote the change of velocity with time ? (b) Give one word which means the same as 'moving with a negative acceleration'. (c) The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero ? Give reason for your answer.
Answer» (a) What term is used to denote the change of velocity with time ? (b) Give one word which means the same as 'moving with a negative acceleration'. (c) The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero ? Give reason for your answer.

1.

(a) What term is used to denote the change of velocity with time ? (b) Give one word which means the same as 'moving with a negative acceleration'. (c) The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero ? Give reason for your answer.

Answer»

(a) What term is used to denote the change of velocity with time ?

(b) Give one word which means the same as 'moving with a negative acceleration'.

(c) The displacement of a moving object in a given interval of time is zero. Would the distance travelled by the object also be zero ? Give reason for your answer.

Discussion

2.	A body starts from the origin with an acceleration of 6 m s−2 along the x-axis and 8 m s−2 along the y-axis. Its distance from the origin after 4 seconds will be
Answer» A body starts from the origin with an acceleration of $6 m s^{- 2}$ along the x-axis and $8 m s^{- 2}$ along the y-axis. Its distance from the origin after $4 s e c o n d s$ will be

Discussion

3.	A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated ?
Answer» A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated ?

3.

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated ?

Answer»

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated ?

Discussion

4.	A bullet of mass 20 g moving with a velocity of 100 ms−1 strikes a wooden block of mass 80 g and gets embedded into it. Calculate velocity of the combined system.
Answer» A bullet of mass $20 g$ moving with a velocity of $100 {m s}^{- 1}$ strikes a wooden block of mass $80 g$ and gets embedded into it. Calculate velocity of the combined system.

Discussion

5.	Prove the Law of Conservation of Momentum [5 MARKS]
Answer» Prove the Law of Conservation of Momentum [5 MARKS]

Discussion

6.	Why does an athlete take a longer jump if he comes running from a distance than when he jumps from the take off line
Answer» Why does an athlete take a longer jump if he comes running from a distance than when he jumps from the take off line

Discussion

7.	A source of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of the wave?
Answer» A source of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of the wave?

Discussion

8.	Which of these is not an application of SONAR?
Answer» Which of these is not an application of SONAR?

Discussion

9.	What type of motion is represented by the tip of the 'seconds' hand' of a watch? Is it uniform or accelerated?
Answer» What type of motion is represented by the tip of the 'seconds' hand' of a watch? Is it uniform or accelerated?

Discussion

10.	The electrical signals are sent to brain via
Answer» The electrical signals are sent to brain via

Discussion

11.	What can you say about the motion of a body if : (a) its displacement-time graph is a straight line ? (b) its velocity-time graph is a straight line?
Answer» What can you say about the motion of a body if : (a) its displacement-time graph is a straight line ? (b) its velocity-time graph is a straight line?

11.

What can you say about the motion of a body if : (a) its displacement-time graph is a straight line ? (b) its velocity-time graph is a straight line?

Answer»

What can you say about the motion of a body if :

(a) its displacement-time graph is a straight line ?

(b) its velocity-time graph is a straight line?

Discussion

12.	A glass flask of volume one litre at 0∘C is filled, level full of mercury at this temperature. The flask and mercury are now heated to 100∘C. How much mercury will spill out, if coefficient of volume expansion of mercury is 1.82×10−4 ∘C and linear expansion of glass is 0.1×10−4 ∘C respectively
Answer» A glass flask of volume one litre at $0^{\circ} C$ is filled, level full of mercury at this temperature. The flask and mercury are now heated to $100^{\circ} C$ . How much mercury will spill out, if coefficient of volume expansion of mercury is 1.82× $10^{- 4 \circ} C$ and linear expansion of glass is 0.1× $10^{- 4 \circ} C$ respectively

Discussion

13.	Who invented the gravitation?
Answer» Who invented the gravitation?

Discussion

14.	Action and reaction are equal and opposite still their resultant is not 0 explain giving an example.
Answer» Action and reaction are equal and opposite still their resultant is not 0 explain giving an example.

Discussion

15.	A man is carrying a load equal to his own weight 'w' on his head. If he jumps from the roof of a building, then the weight experienced by the man during his fall will be :
Answer» A man is carrying a load equal to his own weight 'w' on his head. If he jumps from the roof of a building, then the weight experienced by the man during his fall will be :

Discussion

16.	What is coulombin force ?
Answer» What is coulombin force ?

Discussion

17.	Where does we use average speed and average accelaration
Answer» Where does we use average speed and average accelaration

Discussion

18.	Question 11 Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?
Answer» Question 11 Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

Discussion

19.	A barber raises his customer’s chair by applying a force of 150N to a hydraulic piston of area 0.01 m2. If the chair is attached to a piston of area 0.1 m2, what is the maximum weight of the customer who can be raised by using this chair? Assume the chair itself has a mass of 5 kg.
Answer» A barber raises his customer’s chair by applying a force of 150N to a hydraulic piston of area 0.01 $m^{2}$ . If the chair is attached to a piston of area 0.1 $m^{2}$ , what is the maximum weight of the customer who can be raised by using this chair? Assume the chair itself has a mass of 5 kg.

19.

A barber raises his customer’s chair by applying a force of 150N to a hydraulic piston of area 0.01 m2. If the chair is attached to a piston of area 0.1 m2, what is the maximum weight of the customer who can be raised by using this chair? Assume the chair itself has a mass of 5 kg.

Answer»

A barber raises his customer’s chair by applying a force of 150N to a hydraulic piston of area 0.01 $m^{2}$ . If the chair is attached to a piston of area 0.1 $m^{2}$ , what is the maximum weight of the customer who can be raised by using this chair? Assume the chair itself has a mass of 5 kg.

Discussion

20.	An object is suspended with a string it gets stretched.when the object is completely immersed in water, the extension of string decreases.Explain the reasons of this change.
Answer» An object is suspended with a string it gets stretched.when the object is completely immersed in water, the extension of string decreases.Explain the reasons of this change.

Discussion

21.	How is the gravitational force between two masses affected if the separation between them is doubled?
Answer» How is the gravitational force between two masses affected if the separation between them is doubled?

Discussion

22.	Why do we take three or more readings and then find the mean value when we want to find the weight or volume of an object?
Answer» Why do we take three or more readings and then find the mean value when we want to find the weight or volume of an object?

Discussion

23.	A wave produces 40 crests and 40 troughs in 0.2 seconds. Calculate the frequency of the wave.
Answer» A wave produces 40 crests and 40 troughs in 0.2 seconds. Calculate the frequency of the wave.

Discussion

24.	A particle with uniform acceleration in a striaght line, has velocity v m/s at a position x metre given as . Its acceleration is:
Answer» A particle with uniform acceleration in a striaght line, has velocity v m/s at a position x metre given as . Its acceleration is:

Discussion

25.	Question 5 A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tons (Hint: 1 metric ton = 1000 kg).
Answer» Question 5 A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tons (Hint: 1 metric ton = 1000 kg).

Discussion

26.	Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, g=10 ms−2 and vsound=340 ms−1.
Answer» Tinku dropped a stone into a very deep well. He hears the sound $6.53 s$ after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, $g = 10 m s^{- 2}$ and $v_{s o u n d} = 340 m s^{- 1}$ .

Discussion

27.	How can acceleration be zero when velocity is constant?
Answer» How can acceleration be zero when velocity is constant?

Discussion

28.	What is the power of a pump which takes 10 seconds to lift 100 kg of water to a water tank situated at a height of 20 m? Take g=10 ms−2
Answer» What is the power of a pump which takes 10 seconds to lift 100 kg of water to a water tank situated at a height of 20 m? Take $g = 10 m s^{- 2}$

Discussion

29.	When a bus suddenly starts, the standing passengers fall backwards in the bus. This can be explained by
Answer» When a bus suddenly starts, the standing passengers fall backwards in the bus. This can be explained by

Discussion

30.	A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity, if the retardation due to brakes is 2 m/s2.
Answer» A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity, if the retardation due to brakes is 2 m/s².

Discussion

31.	Which one of these things can a thermal insulator can not do?
Answer» Which one of these things can a thermal insulator can not do?

Discussion

32.	Specific heat capacity depends on
Answer» Specific heat capacity depends on

Discussion

33.	Use Newton's laws of motion to explain the flying of an aeroplane ?
Answer» Use Newton's laws of motion to explain the flying of an aeroplane ?

Discussion

34.	Unit of the radioactivity is Rutherford. Its value is:
Answer» Unit of the radioactivity is Rutherford. Its value is:

Discussion

35.	An artificial planet is moving in a circular orbit of radius(R) 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
Answer» An artificial planet is moving in a circular orbit of radius(R) 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

Discussion

36.	Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it?
Answer» Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it?

Discussion

37.	A 12 kg sheet of tin sinks in water but if the same sheet is converted into a box or boat,it floats.Why ?
Answer» A $\frac{1}{2}$ kg sheet of tin sinks in water but if the same sheet is converted into a box or boat,it floats.Why ?

Discussion

38.	A cricket ball of mass 100 g moving with a speed of 40 m/s is brought to rest by a player in 0.02s. Find the average force applied by the player.
Answer» A cricket ball of mass 100 g moving with a speed of 40 m/s is brought to rest by a player in 0.02s. Find the average force applied by the player.

Discussion

39.	What type of energy is possessed : (a) by the stretched rubber strings of a catapult ? (b) by the piece of stone which is thrown away on releasinig the stretched rubber strings of catapult ?
Answer» What type of energy is possessed : (a) by the stretched rubber strings of a catapult ? (b) by the piece of stone which is thrown away on releasinig the stretched rubber strings of catapult ?

39.

What type of energy is possessed : (a) by the stretched rubber strings of a catapult ? (b) by the piece of stone which is thrown away on releasinig the stretched rubber strings of catapult ?

Answer»

What type of energy is possessed :

(a) by the stretched rubber strings of a catapult ?

(b) by the piece of stone which is thrown away on releasinig the stretched rubber strings of catapult ?

Discussion

40.	In which of the following cases is the work done non-zero?
Answer» In which of the following cases is the work done non-zero?

Discussion

41.	a girl of mass 40 kg jumps with a horizontal velocity of 5 M per second on to a stationary cart with fractionless wheels . the mass of the cat is 3 kg what is her velocity as the car starts moving ?assume that there is no external unbalanced force working in the horizontal direction .
Answer» a girl of mass 40 kg jumps with a horizontal velocity of 5 M per second on to a stationary cart with fractionless wheels . the mass of the cat is 3 kg what is her velocity as the car starts moving ?assume that there is no external unbalanced force working in the horizontal direction .

Discussion

42.	Name the sounds of the frequencies given below : (a) 10 Hz (b) 100 Hz (c) 1000 Hz (d) 40 kHz
Answer» Name the sounds of the frequencies given below : (a) 10 Hz (b) 100 Hz (c) 1000 Hz (d) 40 kHz

42.

Name the sounds of the frequencies given below : (a) 10 Hz (b) 100 Hz (c) 1000 Hz (d) 40 kHz

Answer»

Name the sounds of the frequencies given below :

(a) 10 Hz

(b) 100 Hz

(c) 1000 Hz

(d) 40 kHz

Discussion

43.	Complete the following sentences : (a) Pressure at a depth h in a liquid of density ρ is _____ . (b) Pressure is ___ in all directions about a point in a liquid. (c) Pressure at all points at the same depth is ___ . (d) Pressure at a point inside a liquid is ___ to its depth. (e) Pressure of a liquid at a given depth is ___ to the density of liquid.
Answer» Complete the following sentences : (a) Pressure at a depth h in a liquid of density $ρ$ is _____ . (b) Pressure is ___ in all directions about a point in a liquid. (c) Pressure at all points at the same depth is ___ . (d) Pressure at a point inside a liquid is ___ to its depth. (e) Pressure of a liquid at a given depth is ___ to the density of liquid.

Discussion

44.	Why ,in the formation of petroleum products, it doesn't require the need of oxygen?
Answer» Why ,in the formation of petroleum products, it doesn't require the need of oxygen?

Discussion

45.	APPLICATION OF SECOND LAW OF MOTION : In high jump events, why the athlete is made to jump on a cushioned bed ?
Answer» APPLICATION OF SECOND LAW OF MOTION : In high jump events, why the athlete is made to jump on a cushioned bed ?

45.

APPLICATION OF SECOND LAW OF MOTION : In high jump events, why the athlete is made to jump on a cushioned bed ?

Answer»

APPLICATION OF SECOND LAW OF MOTION :

In high jump events, why the athlete is made to jump on a cushioned bed ?

Discussion

46.	Distinguish between gravity and gravitation
Answer» Distinguish between gravity and gravitation

Discussion

47.	1.What is a solar cell ? 2.State two uses of solar cells. 3.State whether a solar cell produces a.c. or d.c. 4.Give one disadvantage of using a solar cell.
Answer» 1.What is a solar cell ? 2.State two uses of solar cells. 3.State whether a solar cell produces a.c. or d.c. 4.Give one disadvantage of using a solar cell.

47.

1.What is a solar cell ? 2.State two uses of solar cells. 3.State whether a solar cell produces a.c. or d.c. 4.Give one disadvantage of using a solar cell.

Answer»

1.What is a solar cell ?

2.State two uses of solar cells.

3.State whether a solar cell produces a.c. or d.c.

4.Give one disadvantage of using a solar cell.

Discussion

48.	Derive following equations for a uniformly accelerated motion : (i) v=u+at (ii) S=ut+12at2 (iii) v2=u2+2aS where the symbols have their usual meanings.
Answer» Derive following equations for a uniformly accelerated motion : (i) v=u+at (ii) $S = u t + \frac{1}{2} a t^{2}$ (iii) $v^{2} = u^{2} + 2 a S$ where the symbols have their usual meanings.

48.

Derive following equations for a uniformly accelerated motion : (i) v=u+at (ii) S=ut+12at2 (iii) v2=u2+2aS where the symbols have their usual meanings.

Answer»

Derive following equations for a uniformly accelerated motion :

(i) v=u+at

(ii) $S = u t + \frac{1}{2} a t^{2}$

(iii) $v^{2} = u^{2} + 2 a S$

where the symbols have their usual meanings.

Discussion

49.	What is a relative density of a substance?
Answer» What is a relative density of a substance?

Discussion

50.	When a body falls on the earth then what happens to the total energy and why???
Answer» When a body falls on the earth then what happens to the total energy and why???

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A body starts from the origin with an acceleration of 6 m s−2 along the x-axis and 8 m s−2 along the y-axis. Its distance from the origin after 4 seconds will be

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated ?

A bullet of mass 20 g moving with a velocity of 100 ms−1​ strikes a wooden block of mass 80 g and gets embedded into it. Calculate velocity of the combined system.

Prove the Law of Conservation of Momentum [5 MARKS]

Why does an athlete take a longer jump if he comes running from a distance than when he jumps from the take off line

A source of wave produces 40 crests and 40 troughs in 0.4s. What is the frequency of the wave?

Which of these is not an application of SONAR?

What type of motion is represented by the tip of the 'seconds' hand' of a watch? Is it uniform or accelerated?

The electrical signals are sent to brain via

What can you say about the motion of a body if : (a) its displacement-time graph is a straight line ? (b) its velocity-time graph is a straight line?

Who invented the gravitation?

Action and reaction are equal and opposite still their resultant is not 0 explain giving an example.

A man is carrying a load equal to his own weight 'w' on his head. If he jumps from the roof of a building, then the weight experienced by the man during his fall will be :

What is coulombin force ?

Where does we use average speed and average accelaration

Question 11 Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?

A barber raises his customer’s chair by applying a force of 150N to a hydraulic piston of area 0.01 m2. If the chair is attached to a piston of area 0.1 m2, what is the maximum weight of the customer who can be raised by using this chair? Assume the chair itself has a mass of 5 kg.

An object is suspended with a string it gets stretched.when the object is completely immersed in water, the extension of string decreases.Explain the reasons of this change.

How is the gravitational force between two masses affected if the separation between them is doubled?

Why do we take three or more readings and then find the mean value when we want to find the weight or volume of an object? ​​​​​

A wave produces 40 crests and 40 troughs in 0.2 seconds. Calculate the frequency of the wave.

A particle with uniform acceleration in a striaght line, has velocity v m/s at a position x metre given as . Its acceleration is:

Question 5 A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 metric tons (Hint: 1 metric ton = 1000 kg).

Tinku dropped a stone into a very deep well. He hears the sound 6.53 s after he dropped the stone. Find the depth of the well. Take acceleration due to gravity, g=10 ms−2 and vsound=340 ms−1.

How can acceleration be zero when velocity is constant?

What is the power of a pump which takes 10 seconds to lift 100 kg of water to a water tank situated at a height of 20 m? Take g=10 ms−2

When a bus suddenly starts, the standing passengers fall backwards in the bus. This can be explained by

A moving train is brought to rest within 20 seconds by applying brakes. Find the initial velocity, if the retardation due to brakes is 2 m/s2.

Which one of these things can a thermal insulator can not do?

Specific heat capacity depends on

Use Newton's laws of motion to explain the flying of an aeroplane ?

Unit of the radioactivity is Rutherford. Its value is:

An artificial planet is moving in a circular orbit of radius(R) 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it?

A 12 kg sheet of tin sinks in water but if the same sheet is converted into a box or boat,it floats.Why ?

A cricket ball of mass 100 g moving with a speed of 40 m/s is brought to rest by a player in 0.02s. Find the average force applied by the player.

What type of energy is possessed : (a) by the stretched rubber strings of a catapult ? (b) by the piece of stone which is thrown away on releasinig the stretched rubber strings of catapult ?

In which of the following cases is the work done non-zero?

a girl of mass 40 kg jumps with a horizontal velocity of 5 M per second on to a stationary cart with fractionless wheels . the mass of the cat is 3 kg what is her velocity as the car starts moving ?assume that there is no external unbalanced force working in the horizontal direction .

Name the sounds of the frequencies given below : (a) 10 Hz (b) 100 Hz (c) 1000 Hz (d) 40 kHz

Why ,in the formation of petroleum products, it doesn't require the need of oxygen?

APPLICATION OF SECOND LAW OF MOTION : In high jump events, why the athlete is made to jump on a cushioned bed ?

Distinguish between gravity and gravitation

1.What is a solar cell ? 2.State two uses of solar cells. 3.State whether a solar cell produces a.c. or d.c. 4.Give one disadvantage of using a solar cell.

Derive following equations for a uniformly accelerated motion : (i) v=u+at (ii) S=ut+12at2 (iii) v2=u2+2aS where the symbols have their usual meanings.

What is a relative density of a substance?

When a body falls on the earth then what happens to the total energy and why???

A bullet of mass 20 g moving with a velocity of 100 ms−1 strikes a wooden block of mass 80 g and gets embedded into it. Calculate velocity of the combined system.

Why do we take three or more readings and then find the mean value when we want to find the weight or volume of an object?