13232 + Interview Questions in Physics

1.	While catching a ball ,the cricketer withdraws his hands. Does this reduce the change of momentum of the ball? How is it advantageous?
Answer» While catching a ball ,the cricketer withdraws his hands. Does this reduce the change of momentum of the ball? How is it advantageous?

Discussion

2.	Seven homo genous bricks , each of length L , are arranged as shown below. Each brick is displaced with respect to the one in contact by L10. Find X coordinate of the centre of mass relative to the origin shown
Answer» Seven homo genous bricks , each of length $L$ , are arranged as shown below. Each brick is displaced with respect to the one in contact by $\frac{L}{10}$ . Find $X$ coordinate of the centre of mass relative to the origin shown

2.

Seven homo genous bricks , each of length L , are arranged as shown below. Each brick is displaced with respect to the one in contact by L10. Find X coordinate of the centre of mass relative to the origin shown

Answer»

Seven homo genous bricks , each of length $L$ , are arranged as shown below. Each brick is displaced with respect to the one in contact by $\frac{L}{10}$ . Find $X$ coordinate of the centre of mass relative to the origin shown

Discussion

3.	The main reason that a Flosbury flop was so efficient was
Answer» The main reason that a Flosbury flop was so efficient was

Discussion

4.	Can you arrive at Newton's 3rd law using Newton's 2nd Law ?
Answer» Can you arrive at Newton's 3rd law using Newton's 2nd Law ?

Discussion

5.	Which of the following devices in not based on Pascal's law?
Answer» Which of the following devices in not based on Pascal's law?

Discussion

6.	The relative densities of four liquids P, Q, R, and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is made to float in all these liquids, one by one. The object floats in all liquids. In which liquid the object will float with its maximum volume submerged under the liquid?
Answer» The relative densities of four liquids P, Q, R, and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is made to float in all these liquids, one by one. The object floats in all liquids. In which liquid the object will float with its maximum volume submerged under the liquid?

Discussion

7.	Audio frequency range of human ear is 20 Hz to 20000 Hz. The range of human ear in terms of time period is
Answer» Audio frequency range of human ear is 20 Hz to 20000 Hz. The range of human ear in terms of time period is

Discussion

8.	The force of friction between the surface of a floor and the surface of the box in contact with the floor is 500N. How much minimum force has to be applied on the box in order to move the box on the floor with constant velocity?
Answer» The force of friction between the surface of a floor and the surface of the box in contact with the floor is 500N. How much minimum force has to be applied on the box in order to move the box on the floor with constant velocity?

Discussion

9.	Define force of gravitation. [1 MARK]
Answer» Define force of gravitation. [1 MARK]

Discussion

10.	Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The acceleration because of gravitational force is in the range of 10−12ms2. Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The force of friction is much higher than the gravitational force. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?
Answer» Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The acceleration because of gravitational force is in the range of $10^{- 12} \frac{m}{s^{2}}$ . Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The force of friction is much higher than the gravitational force. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?

10.

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The acceleration because of gravitational force is in the range of 10−12ms2. Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The force of friction is much higher than the gravitational force. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?

Answer»

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?

Statement 1: The acceleration because of gravitational force is in the range of $10^{- 12} \frac{m}{s^{2}}$ .

Statement 2: Stones are lying on a flat surface, so they cannot move.

Statement 3: The force of friction is much higher than the gravitational force.

Statement 4: The stones are irregular in shape, so they cannot move.

Which statements explains the reason for the above question?

Discussion

11.	Question 14 Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in Figure given below. Calculate the acceleration and frictional force of the floor on the ball.
Answer» Question 14 Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in Figure given below. Calculate the acceleration and frictional force of the floor on the ball.

Discussion

12.	If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :
Answer» If $F_{1}$ is the magnitude of the force exerted on the Sun by Earth and $F_{2}$ is the magnitude of the force exerted on Earth by the Sun, then :

Discussion

13.	Consider the following statements - 1. Rubbing of hair through the comb 2. The circuit connected to a cell/generator 3. Static Electricity 4. Current Electricity Which of the following is correctly matched?
Answer» Consider the following statements - 1. Rubbing of hair through the comb 2. The circuit connected to a cell/generator 3. Static Electricity 4. Current Electricity Which of the following is correctly matched?

13.

Consider the following statements - 1. Rubbing of hair through the comb 2. The circuit connected to a cell/generator 3. Static Electricity 4. Current Electricity Which of the following is correctly matched?

Answer»

Consider the following statements -

1. Rubbing of hair through the comb

2. The circuit connected to a cell/generator

3. Static Electricity

4. Current Electricity

Which of the following is correctly matched?

Discussion

14.	The velocity of a freely falling body one second after being dropped is
Answer» The velocity of a freely falling body one second after being dropped is

Discussion

15.	Describe the motion depicted in the given below graphs. [3 MARKS]
Answer» Describe the motion depicted in the given below graphs. [3 MARKS]

15.

Describe the motion depicted in the given below graphs. [3 MARKS]

Answer»

Describe the motion depicted in the given below graphs. [3 MARKS]

Discussion

16.	Due to an impulse, the change in momentum of a body is 1.8 kg ms−1. How much is the force acted on it if the duration of the force acting is 0.2 s ?
Answer» Due to an impulse, the change in momentum of a body is $1.8 k g m s^{- 1}$ . How much is the force acted on it if the duration of the force acting is $0.2 s$ ?

Discussion

17.	Find the centre of mass of uniform L-shaped lamina (a thin flat plate) with dimensions as shown in figure. The mass of lamina is 3 kg
Answer» Find the centre of mass of uniform L-shaped lamina (a thin flat plate) with dimensions as shown in figure. The mass of lamina is 3 kg

Discussion

18.	What is energy of motion called?
Answer» What is energy of motion called?

Discussion

19.	Which of the following is preferred as a thermometric liquid?
Answer» Which of the following is preferred as a thermometric liquid?

Discussion

20.	According to Newton's third law of motion, the action and reaction always act on:
Answer» According to Newton's third law of motion, the action and reaction always act on:

Discussion

21.	The acceleration of an object is inversely proportional to:
Answer» The acceleration of an object is inversely proportional to:

Discussion

22.	A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m s−1. (b) Will the man be able to hear a distinct echo? Explain the answer.
Answer» A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m $s^{- 1}$ . (b) Will the man be able to hear a distinct echo? Explain the answer.

22.

A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m s−1. (b) Will the man be able to hear a distinct echo? Explain the answer.

Answer»

A man standing 25 m away from a wall produces a sound and receives the reflected sound.

(a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m $s^{- 1}$ .

(b) Will the man be able to hear a distinct echo? Explain the answer.

Discussion

23.	If the object is placed between focus and centre of curvature of a concave mirror then where will be the image formed?
Answer» If the object is placed between focus and centre of curvature of a concave mirror then where will be the image formed?

Discussion

24.	A construction worker’s helmet slips and falls down when he is 78.4m above the ground. He hears the sound of the helmet hitting the ground 4.23 s after it has slipped. Find the speed of sound in air. ( Take g=9.8 ms−2).
Answer» A construction worker’s helmet slips and falls down when he is $78.4 m$ above the ground. He hears the sound of the helmet hitting the ground $4.23 s$ after it has slipped. Find the speed of sound in air. ( Take $g = 9.8 m s^{- 2}$ ).

Discussion

25.	A wire of resistance 6Ω is cut into three equal pieces, which are joined to form a triangle. The equivalent resistance between any two corners of the triangle is:
Answer» A wire of resistance $6 Ω$ is cut into three equal pieces, which are joined to form a triangle. The equivalent resistance between any two corners of the triangle is:

Discussion

26.	A current of 0.5 A flows through a bulb for 2 minutes. Find the net charge that flows through the conductor.
Answer» A current of 0.5 A flows through a bulb for 2 minutes. Find the net charge that flows through the conductor.

Discussion

27.	A child is moving on a skateboard at the speed of 2 ms−1. After a force acts on him, his speed becomes 3 ms−1. Calculate the work done by the force, if the weight of the child is 20 kg.
Answer» A child is moving on a skateboard at the speed of $2 m s^{- 1}$ . After a force acts on him, his speed becomes $3 m s^{- 1}$ . Calculate the work done by the force, if the weight of the child is $20 k g$ .

Discussion

28.	What is meant by the statement that acceleration due to gravity is 9.8m/s2?
Answer» What is meant by the statement that acceleration due to gravity is 9.8m/s²?

Discussion

29.	How much amount of work needs to be done to increase the velocity of an object from 4 ms−1 to 6 ms−1, if the mass of the object is 10 kg.
Answer» How much amount of work needs to be done to increase the velocity of an object from $4 m s^{- 1}$ to $6 m s^{- 1}$ , if the mass of the object is $10 k g$ .

Discussion

30.	If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :
Answer» If $F_{1}$ is the magnitude of the force exerted on the Sun by Earth and $F_{2}$ is the magnitude of the force exerted on Earth by the Sun, then :

Discussion

31.	Question 33 Draw ray diagrams showing the image formation by a concave lens when an object is placed (a) at the focus of the lens (b) between focus and twice the focal length of the lens (c) beyond twice the focal length of the lens
Answer» Question 33 Draw ray diagrams showing the image formation by a concave lens when an object is placed (a) at the focus of the lens (b) between focus and twice the focal length of the lens (c) beyond twice the focal length of the lens

Discussion

32.	Question 6 An object of mass 2 kg is sliding with a constant velocity of 4 ms-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N (b) 0 N (c) 2 N (d) 8 N
Answer» Question 6 An object of mass 2 kg is sliding with a constant velocity of 4 ms^-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N (b) 0 N (c) 2 N (d) 8 N

Discussion

33.	Glen has raised a dumbbell of mass 5 kg to a height of 10 m above the ground. Calculate the work done by Glen? (Take g=10 ms−2)500
Answer» Glen has raised a dumbbell of mass 5 kg to a height of 10 m above the ground. Calculate the work done by Glen? (Take $g = 10 m s^{- 2}$ ) 500

Discussion

34.	A cricket ball is dropped from a height of 20 m. Calculate the speed of the Ball when it hits the ground and calculate the time it takes to fall through this height. (g=10ms−2)
Answer» A cricket ball is dropped from a height of 20 m. Calculate the speed of the Ball when it hits the ground and calculate the time it takes to fall through this height. ( $g = 10 m s^{- 2}$ )

Discussion

35.	An object thrown vertically upwards, rises to a maximum height of 10 m. What is the velocity with which it is thrown upwards? (Take g=9.8 m s−2)14
Answer» An object thrown vertically upwards, rises to a maximum height of $10 m$ . What is the velocity with which it is thrown upwards? (Take $g = 9.8 m s^{- 2}$ ) 14

Discussion

36.	How the holes made in a sonometer box will intensify the sound?
Answer» How the holes made in a sonometer box will intensify the sound?

Discussion

37.	How many kg is 5 metric tonne?
Answer» How many kg is 5 metric tonne?

Discussion

38.	On which day, a hot or a cold day, an echo is heard sooner ? Give reason for your answer.
Answer» On which day, a hot or a cold day, an echo is heard sooner ? Give reason for your answer.

Discussion

39.	Which of the following statements are true?
Answer» Which of the following statements are true?

Discussion

40.	Question 15 An object of mass 1 kg travelling in a straight line with a velocity of 10 ms−1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.
Answer» Question 15 An object of mass 1 kg travelling in a straight line with a velocity of $10 m s^{- 1}$ collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

Discussion

41.	A stationary 4.00 kg shell explodes into three pieces. Two of the fragments have a mass of 1.00 kg each and move along the paths shown with a speed of 10.0 m/s. The third fragment moves upward as shown. What is the speed of the third fragment?
Answer» A stationary 4.00 kg shell explodes into three pieces. Two of the fragments have a mass of 1.00 kg each and move along the paths shown with a speed of 10.0 m/s. The third fragment moves upward as shown. What is the speed of the third fragment?

41.

A stationary 4.00 kg shell explodes into three pieces. Two of the fragments have a mass of 1.00 kg each and move along the paths shown with a speed of 10.0 m/s. The third fragment moves upward as shown. What is the speed of the third fragment?

Answer»

A stationary 4.00 kg shell explodes into three pieces. Two of the fragments have a mass of 1.00 kg each and move along the paths shown with a speed of 10.0 m/s. The third fragment moves upward as shown. What is the speed of the third fragment?

Discussion

42.	The strength of an electromagnet can be increased by
Answer» The strength of an electromagnet can be increased by

Discussion

43.	A body of mass 2 kg , initially moving with a velocity of 10 m/s collides with another body of mass 5 kg at rest. After collision velocity of first body becomes 1 m/s . Find the velocity of the second body.
Answer» A body of mass 2 kg , initially moving with a velocity of 10 m/s collides with another body of mass 5 kg at rest. After collision velocity of first body becomes 1 m/s . Find the velocity of the second body.

Discussion

44.	The point on a wave with the maximum value of downward displacement within a cycle is called___ .
Answer» The point on a wave with the maximum value of downward displacement within a cycle is called___ .

Discussion

45.	If T is the time period of a simple pendulum, then the frequency f and T are related by f =___ .
Answer» If T is the time period of a simple pendulum, then the frequency f and T are related by f =___ .

Discussion

46.	A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens. [2 MARKS]
Answer» A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens. [2 MARKS]

Discussion

47.	If 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of that mirror, then which of the following is true?
Answer» If 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of that mirror, then which of the following is true?

Discussion

48.	Important formulas in the chapter force and laws of motion.
Answer» Important formulas in the chapter force and laws of motion.

Discussion

49.	A pump is required to lift 1000kg of water per minute from a well 12 m Deep and Eject it with a speed of 20 m/s. what must be the power output of the pump??
Answer» A pump is required to lift 1000kg of water per minute from a well 12 m Deep and Eject it with a speed of 20 m/s. what must be the power output of the pump??

Discussion

50.	A ball released from a height Falls 5 metre in 1 second in 4 seconds its Falls through
Answer» A ball released from a height Falls 5 metre in 1 second in 4 seconds its Falls through

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

While catching a ball ,the cricketer withdraws his hands. Does this reduce the change of momentum of the ball? How is it advantageous?

Seven homo genous bricks , each of length L , are arranged as shown below. Each brick is displaced with respect to the one in contact by L10. Find X coordinate of the centre of mass relative to the origin shown

The main reason that a Flosbury flop was so efficient was

Can you arrive at Newton's 3rd law using Newton's 2nd Law ?

Which of the following devices in not based on Pascal's law?

The relative densities of four liquids P, Q, R, and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is made to float in all these liquids, one by one. The object floats in all liquids. In which liquid the object will float with its maximum volume submerged under the liquid?

Audio frequency range of human ear is 20 Hz to 20000 Hz. The range of human ear in terms of time period is

The force of friction between the surface of a floor and the surface of the box in contact with the floor is 500N. How much minimum force has to be applied on the box in order to move the box on the floor with constant velocity?

Define force of gravitation. [1 MARK]

Question 14 Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in Figure given below. Calculate the acceleration and frictional force of the floor on the ball.

If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :

Consider the following statements - 1. Rubbing of hair through the comb 2. The circuit connected to a cell/generator 3. Static Electricity 4. Current Electricity Which of the following is correctly matched?

The velocity of a freely falling body one second after being dropped is

Describe the motion depicted in the given below graphs. [3 MARKS]

Due to an impulse, the change in momentum of a body is 1.8 kg ms−1. How much is the force acted on it if the duration of the force acting is 0.2 s ?

Find the centre of mass of uniform L-shaped lamina (a thin flat plate) with dimensions as shown in figure. The mass of lamina is 3 kg

What is energy of motion called?

Which of the following is preferred as a thermometric liquid?

According to Newton's third law of motion, the action and reaction always act on:

The acceleration of an object is inversely proportional to:

A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m s−1. (b) Will the man be able to hear a distinct echo? Explain the answer.

If the object is placed between focus and centre of curvature of a concave mirror then where will be the image formed?

A construction worker’s helmet slips and falls down when he is 78.4m above the ground. He hears the sound of the helmet hitting the ground 4.23 s after it has slipped. Find the speed of sound in air. ( Take g=9.8 ms−2).

A wire of resistance 6Ω is cut into three equal pieces, which are joined to form a triangle. The equivalent resistance between any two corners of the triangle is:

A current of 0.5 A flows through a bulb for 2 minutes. Find the net charge that flows through the conductor.

A child is moving on a skateboard at the speed of 2 ms−1. After a force acts on him, his speed becomes 3 ms−1. Calculate the work done by the force, if the weight of the child is 20 kg.

What is meant by the statement that acceleration due to gravity is 9.8m/s2?

How much amount of work needs to be done to increase the velocity of an object from 4 ms−1 to 6 ms−1, if the mass of the object is 10 kg.

If F1 is the magnitude of the force exerted on the Sun by Earth and F2 is the magnitude of the force exerted on Earth by the Sun, then :

Question 33 Draw ray diagrams showing the image formation by a concave lens when an object is placed (a) at the focus of the lens (b) between focus and twice the focal length of the lens (c) beyond twice the focal length of the lens

Question 6 An object of mass 2 kg is sliding with a constant velocity of 4 ms-1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N (b) 0 N (c) 2 N (d) 8 N

Glen has raised a dumbbell of mass 5 kg to a height of 10 m above the ground. Calculate the work done by Glen? (Take g=10 ms−2)500

A cricket ball is dropped from a height of 20 m. Calculate the speed of the Ball when it hits the ground and calculate the time it takes to fall through this height. (g=10ms−2)

An object thrown vertically upwards, rises to a maximum height of 10 m. What is the velocity with which it is thrown upwards? (Take g=9.8 m s−2)14

How the holes made in a sonometer box will intensify the sound?

How many kg is 5 metric tonne?

On which day, a hot or a cold day, an echo is heard sooner ? Give reason for your answer.

Which of the following statements are true?

A stationary 4.00 kg shell explodes into three pieces. Two of the fragments have a mass of 1.00 kg each and move along the paths shown with a speed of 10.0 m/s. The third fragment moves upward as shown. What is the speed of the third fragment?

The strength of an electromagnet can be increased by

A body of mass 2 kg , initially moving with a velocity of 10 m/s collides with another body of mass 5 kg at rest. After collision velocity of first body becomes 1 m/s . Find the velocity of the second body.

The point on a wave with the maximum value of downward displacement within a cycle is called___ .

If T is the time period of a simple pendulum, then the frequency f and T are related by f =___ .

A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens. [2 MARKS]

If 'R' is the radius of curvature of a spherical mirror and 'F' is the focal length of that mirror, then which of the following is true?

Important formulas in the chapter force and laws of motion.

A pump is required to lift 1000kg of water per minute from a well 12 m Deep and Eject it with a speed of 20 m/s. what must be the power output of the pump??

A ball released from a height Falls 5 metre in 1 second in 4 seconds its Falls through