13232 + Interview Questions in Physics

1.	Hhow to make a projectile go around the Earth. Such the it starts orbiting the earth
Answer» Hhow to make a projectile go around the Earth. Such the it starts orbiting the earth

Discussion

2.	Why does pressure increase as you go deeper underwater?
Answer» Why does pressure increase as you go deeper underwater?

Discussion

3.	A force of 20 Newton acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is the acceleration.
Answer» A force of 20 Newton acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is the acceleration.

Discussion

4.	Mark the correct statement(s) (1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration. (2) If velocity of a body is varying, its speed must be varying. (3) A body moving with varying velocity may have constant speed. (4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.
Answer» Mark the correct statement(s) (1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration. (2) If velocity of a body is varying, its speed must be varying. (3) A body moving with varying velocity may have constant speed. (4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

4.

Mark the correct statement(s) (1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration. (2) If velocity of a body is varying, its speed must be varying. (3) A body moving with varying velocity may have constant speed. (4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

Answer»

Mark the correct statement(s)
(1) If speed of a body is varying, its velocity must be varying and it must have non-zero acceleration.

(2) If velocity of a body is varying, its speed must be varying.

(3) A body moving with varying velocity may have constant speed.

(4) A body moving with varying speed may have constant velocity, if its direction of motion remains constant.

Discussion

5.	Q1) The passengers sitting in a moving train find each other at rest but road side tree in motion . explain the motion in this context.
Answer» Q1) The passengers sitting in a moving train find each other at rest but road side tree in motion . explain the motion in this context.

Discussion

6.	Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 10C. Assume no energy is lost during process. Specific heat capacity of water = 4200 J/kg ∘C Accelaration due to gravity = 10 m/s2
Answer» Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 1⁰C. Assume no energy is lost during process. Specific heat capacity of water = $4200 J / k g^{\circ} C$ Accelaration due to gravity = $10 m / s^{2}$

6.

Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 10C. Assume no energy is lost during process. Specific heat capacity of water = 4200 J/kg ∘C Accelaration due to gravity = 10 m/s2

Answer»

Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 1⁰C. Assume no energy is lost during process.

Specific heat capacity of water = $4200 J / k g^{\circ} C$

Accelaration due to gravity = $10 m / s^{2}$

Discussion

7.	One Watt is
Answer» One Watt is

Discussion

8.	What is the magnitude of net force in the given situation?
Answer» What is the magnitude of net force in the given situation?

Discussion

9.	In conservation of momentum:
Answer» In conservation of momentum:

Discussion

10.	Question 9 Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be (a) 14 times (b) 4 times (c) 12 times (d) Unchanged
Answer» Question 9 Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be (a) $\frac{1}{4} t i m e s$ (b) $4 t i m e s$ (c) $\frac{1}{2} t i m e s$ (d) Unchanged

Discussion

11.	Is the weight of body more at the equator or at poles ?
Answer» Is the weight of body more at the equator or at poles ?

Discussion

12.	(a) Define the term 'energy' of a body. What is the SI unit of energy. (b) What are the various forms of energy ? (c) Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.
Answer» (a) Define the term 'energy' of a body. What is the SI unit of energy. (b) What are the various forms of energy ? (c) Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.

12.

(a) Define the term 'energy' of a body. What is the SI unit of energy. (b) What are the various forms of energy ? (c) Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.

Answer»

(a) Define the term 'energy' of a body. What is the SI unit of energy.

(b) What are the various forms of energy ?

(c) Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.

Discussion

13.	A toy train of mass 1 kg moves with a constant velocity of 8 m/s, when connected to a battery of 8 volts. Find the current in the circuit if the battery was connected for 4 s. Assume no energy loss due to friction.
Answer» A toy train of mass 1 kg moves with a constant velocity of 8 m/s, when connected to a battery of 8 volts. Find the current in the circuit if the battery was connected for 4 s. Assume no energy loss due to friction.

Discussion

14.	We know that the two glass rods become charged when rubbed with a silk cloth, it would be safe to say they acquire ___ charges.
Answer» We know that the two glass rods become charged when rubbed with a silk cloth, it would be safe to say they acquire ___ charges.

Discussion

15.	A stone is dropped from the edge of the roof. (a) how long does it take to fall 4.9m? (b) how fast does it move at the end of that fall? (c) what is the acceleration move at the end of 7.9m?
Answer» A stone is dropped from the edge of the roof. (a) how long does it take to fall 4.9m? (b) how fast does it move at the end of that fall? (c) what is the acceleration move at the end of 7.9m?

15.

A stone is dropped from the edge of the roof. (a) how long does it take to fall 4.9m? (b) how fast does it move at the end of that fall? (c) what is the acceleration move at the end of 7.9m?

Answer»

A stone is dropped from the edge of the roof.

(a) how long does it take to fall 4.9m?

(b) how fast does it move at the end of that fall?

(c) what is the acceleration move at the end of 7.9m?

Discussion

16.	Which of the following statements are correct about power? 1. It is the rate of change of momentum. 2. It is the rate of change of force. 3. It is the rate of doing work. 4. The S.I. unit of power is watt.
Answer» Which of the following statements are correct about power? 1. It is the rate of change of momentum. 2. It is the rate of change of force. 3. It is the rate of doing work. 4. The S.I. unit of power is watt.

Discussion

17.	A Porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done on the luggage.
Answer» A Porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done on the luggage.

Discussion

18.	A bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity of 100 m/s. Identify the velocity of the recoil of the gun.
Answer» A bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity of 100 m/s. Identify the velocity of the recoil of the gun.

Discussion

19.	What is the buoyant force experienced by a cube of side 10 cm which is completely immersed in water? (Take g=10 m s−2 and density of water =1000 kg m−3)
Answer» What is the buoyant force experienced by a cube of side $10 c m$ which is completely immersed in water? (Take $g = 10 m s^{- 2}$ and density of water $= 1000 k g m^{- 3}$ )

Discussion

20.	Name the scientist who gave the three laws of planetary motion.
Answer» Name the scientist who gave the three laws of planetary motion.

Discussion

21.	Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place, determine the total power required if the dragging time is 20 minutes.
Answer» Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place, determine the total power required if the dragging time is 20 minutes.

Discussion

22.	Leaves fall when branch of tree is shaken vigrously
Answer» Leaves fall when branch of tree is shaken vigrously

Discussion

23.	Write the formula for work done on a body when the body moves at an angle to the direction of the force. Give the meaning of each symbol used.
Answer» Write the formula for work done on a body when the body moves at an angle to the direction of the force. Give the meaning of each symbol used.

Discussion

24.	Why do we weigh weightless when the lift falls down when it's cord is cut?
Answer» Why do we weigh weightless when the lift falls down when it's cord is cut?

Discussion

25.	Calculate the value of the electric current (i) in the following circuit.
Answer» Calculate the value of the electric current $(i)$ in the following circuit.

Discussion

26.	What are the different ways of conserving minerals?
Answer» What are the different ways of conserving minerals?

Discussion

27.	What are gravitons?
Answer» What are gravitons?

Discussion

28.	Average velocity of a particle moving in a straight line,with constant acceleration a and intial velocity u in first t seconds is ??
Answer» Average velocity of a particle moving in a straight line,with constant acceleration a and intial velocity u in first t seconds is ??

Discussion

29.	A body has an initial velocity of 4m/s and deceleration of 4m/ss, then what is the final velocity after travelling 2m?
Answer» A body has an initial velocity of 4m/s and deceleration of 4m/s^s, then what is the final velocity after travelling 2m?

Discussion

30.	You have a metallic cube of side 3cm . If the density of the metal is about 8000kg m-3 the best suited spring balance for determining the weight of the cube should have a range of :: a) 0 - 100 g.wt b) 0 - 200 g.wt c) 0 - 250 g.wt d) 0 - 500 g.wt Explain why.
Answer» You have a metallic cube of side 3cm . If the density of the metal is about 8000kg m^-3 the best suited spring balance for determining the weight of the cube should have a range of :: a) 0 - 100 g.wt b) 0 - 200 g.wt c) 0 - 250 g.wt d) 0 - 500 g.wt Explain why.

Discussion

31.	A body's velocity changes from 25 m s−1 to 28 m s−1 in 15 s. If the mass of the body is 100 kg, what is the force (in newton) exerted by the body?20
Answer» A body's velocity changes from $25 {m s}^{- 1}$ to $28 {m s}^{- 1}$ in $15 s$ . If the mass of the body is $100 kg$ , what is the force (in newton) exerted by the body? 20

Discussion

32.	A person standing near the track of a fast moving train has a tendency to fall towards it because of:
Answer» A person standing near the track of a fast moving train has a tendency to fall towards it because of:

Discussion

33.	Define the statement "rest and motion are relative terms" with some examples
Answer» Define the statement "rest and motion are relative terms" with some examples

Discussion

34.	A truck weighing 1000 kgf changes its speed from 36 km h−1 to 72 km h−1 in 2 minutes.Calculate:(i) the work done by the engine,and (ii) its power.(g=10 ms−2)
Answer» A truck weighing 1000 kgf changes its speed from 36 km $h^{- 1}$ to 72 km $h^{- 1}$ in 2 minutes.Calculate: (i) the work done by the engine,and (ii) its power.(g=10 m $s^{- 2}$ )

34.

A truck weighing 1000 kgf changes its speed from 36 km h−1 to 72 km h−1 in 2 minutes.Calculate:(i) the work done by the engine,and (ii) its power.(g=10 ms−2)

Answer»

A truck weighing 1000 kgf changes its speed from 36 km $h^{- 1}$ to 72 km $h^{- 1}$ in 2 minutes.Calculate:

(i) the work done by the engine,and

(ii) its power.(g=10 m $s^{- 2}$ )

Discussion

35.	A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball.
Answer» A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball.

Discussion

36.	The following graph is drawn for parallel and series combination of resistors in a circuit. Which of the following is true about the graph?
Answer» The following graph is drawn for parallel and series combination of resistors in a circuit. Which of the following is true about the graph?

36.

The following graph is drawn for parallel and series combination of resistors in a circuit. Which of the following is true about the graph?

Answer»

The following graph is drawn for parallel and series combination of resistors in a circuit. Which of the following is true about the graph?

Discussion

37.	A certain amount of work "W" was done in 10 seconds. If the same amount of work was done in 20 seconds, what will be the change in power?
Answer» A certain amount of work "W" was done in 10 seconds. If the same amount of work was done in 20 seconds, what will be the change in power?

Discussion

38.	How do you find change in velocity from time-velocity graph ?
Answer» How do you find change in velocity from time-velocity graph ?

Discussion

39.	A body floats in kerosene of density 0.8×103 kg/m3 up to a certain mark.If the same body is placed in water of density 10×103 kg/m3,will it sink more or less ? Give reason for your answer.
Answer» A body floats in kerosene of density $0.8 \times 10^{3} k g / m^{3}$ up to a certain mark.If the same body is placed in water of density $10 \times 10^{3} k g / m^{3}$ ,will it sink more or less ? Give reason for your answer.

Discussion

40.	When a force F acts on a stationary body for the time t, the distance covered by the body will be proportional to
Answer» When a force F acts on a stationary body for the time t, the distance covered by the body will be proportional to

Discussion

41.	Why should we pivot the compass needle on a sharp pin?
Answer» Why should we pivot the compass needle on a sharp pin?

Discussion

42.	What is the universal law of gravity?
Answer» What is the universal law of gravity?

Discussion

43.	The lowest temperature at which a substance catches fire is called its:
Answer» The lowest temperature at which a substance catches fire is called its:

Discussion

44.	What is reference point ? When we say this is in motion or that is in rest?
Answer» What is reference point ? When we say this is in motion or that is in rest?

Discussion

45.	When a fireman directs a powerful stream of water on a fire from a hose-pipe, the hose-pipe tends to go backward. This is due to:
Answer» When a fireman directs a powerful stream of water on a fire from a hose-pipe, the hose-pipe tends to go backward. This is due to:

Discussion

46.	Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of lake.
Answer» Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of lake.

Discussion

47.	In the given figure there are three points A, B, and C having pressure PA,PB, and PC respectively. Identify the correct option:
Answer» In the given figure there are three points $A, B,$ and $C$ having pressure $P_{A}, P_{B}$ , and $P_{C}$ respectively. Identify the correct option:

Discussion

48.	Which one of the following is the correct expression for linear magnification for lens.
Answer» Which one of the following is the correct expression for linear magnification for lens.

Discussion

49.	A block of mass 5kg is lifted vertically upwards to a height of 1.5m at a constant speed. What is the work done by the applied force
Answer» A block of mass 5kg is lifted vertically upwards to a height of 1.5m at a constant speed. What is the work done by the applied force

Discussion

50.	Why at the centre of earth gravitational force is zero .is it because r=0 or the mass of earth at that point is zero?
Answer» Why at the centre of earth gravitational force is zero .is it because r=0 or the mass of earth at that point is zero?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Hhow to make a projectile go around the Earth. Such the it starts orbiting the earth

Why does pressure increase as you go deeper underwater?

A force of 20 Newton acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is the acceleration.

Q1) The passengers sitting in a moving train find each other at rest but road side tree in motion . explain the motion in this context.

Calculate the height of a water-fall through which the fall of water leads to increase in its temperature by 10C. Assume no energy is lost during process. Specific heat capacity of water = 4200 J/kg ∘C Accelaration due to gravity = 10 m/s2

One Watt is

What is the magnitude of net force in the given situation?

In conservation of momentum:

Question 9 Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be (a) 14 times (b) 4 times (c) 12 times (d) Unchanged

Is the weight of body more at the equator or at poles ?

(a) Define the term 'energy' of a body. What is the SI unit of energy. (b) What are the various forms of energy ? (c) Two bodies having equal masses are moving with uniform speeds of v and 2v respectively. Find the ratio of their kinetic energies.

A toy train of mass 1 kg moves with a constant velocity of 8 m/s, when connected to a battery of 8 volts. Find the current in the circuit if the battery was connected for 4 s. Assume no energy loss due to friction.

We know that the two glass rods become charged when rubbed with a silk cloth, it would be safe to say they acquire ___ charges.

A stone is dropped from the edge of the roof. (a) how long does it take to fall 4.9m? (b) how fast does it move at the end of that fall? (c) what is the acceleration move at the end of 7.9m?

Which of the following statements are correct about power? 1. It is the rate of change of momentum. 2. It is the rate of change of force. 3. It is the rate of doing work. 4. The S.I. unit of power is watt.

A Porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done on the luggage.

A bullet of mass 100 g is fired from a gun of mass 20 kg with a velocity of 100 m/s. Identify the velocity of the recoil of the gun.

What is the buoyant force experienced by a cube of side 10 cm which is completely immersed in water? (Take g=10 m s−2 and density of water =1000 kg m−3)

Name the scientist who gave the three laws of planetary motion.

Arun is travelling with his friends in a car. The car suddenly stops due to some problem in the engine. If Arun and his friends apply a force of 1000 N to drag the car to the nearest garage that is 1.2 km from that place, determine the total power required if the dragging time is 20 minutes.

Leaves fall when branch of tree is shaken vigrously

Write the formula for work done on a body when the body moves at an angle to the direction of the force. Give the meaning of each symbol used.

Why do we weigh weightless when the lift falls down when it's cord is cut?

Calculate the value of the electric current (i) in the following circuit.

What are the different ways of conserving minerals?

What are gravitons?

Average velocity of a particle moving in a straight line,with constant acceleration a and intial velocity u in first t seconds is ??

A body has an initial velocity of 4m/s and deceleration of 4m/s​​​​​s​​​​​, then what is the final velocity after travelling 2m?

You have a metallic cube of side 3cm . If the density of the metal is about 8000kg m-3 the best suited spring balance for determining the weight of the cube should have a range of :: a) 0 - 100 g.wt b) 0 - 200 g.wt c) 0 - 250 g.wt d) 0 - 500 g.wt Explain why.

A body's velocity changes from 25 m s−1 to 28 m s−1 in 15 s. If the mass of the body is 100 kg, what is the force (in newton) exerted by the body?20

A person standing near the track of a fast moving train has a tendency to fall towards it because of:

Define the statement "rest and motion are relative terms" with some examples

A truck weighing 1000 kgf changes its speed from 36 km h−1 to 72 km h−1 in 2 minutes.Calculate:(i) the work done by the engine,and (ii) its power.(g=10 ms−2)

A ball of mass 0.5 kg slows down from a speed of 5 m/s to that of 3 m/s. Calculate the change in kinetic energy of the ball.

The following graph is drawn for parallel and series combination of resistors in a circuit. Which of the following is true about the graph?

A certain amount of work "W" was done in 10 seconds. If the same amount of work was done in 20 seconds, what will be the change in power?

How do you find change in velocity from time-velocity graph ?

A body floats in kerosene of density 0.8×103 kg/m3 up to a certain mark.If the same body is placed in water of density 10×103 kg/m3,will it sink more or less ? Give reason for your answer.

When a force F acts on a stationary body for the time t, the distance covered by the body will be proportional to

Why should we pivot the compass needle on a sharp pin?

What is the universal law of gravity?

The lowest temperature at which a substance catches fire is called its:

What is reference point ? When we say this is in motion or that is in rest?

When a fireman directs a powerful stream of water on a fire from a hose-pipe, the hose-pipe tends to go backward. This is due to:

Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of lake.

In the given figure there are three points A, B, and C having pressure PA,PB, and PC respectively. Identify the correct option:

Which one of the following is the correct expression for linear magnification for lens.

A block of mass 5kg is lifted vertically upwards to a height of 1.5m at a constant speed. What is the work done by the applied force

Why at the centre of earth gravitational force is zero .is it because r=0 or the mass of earth at that point is zero?

A body has an initial velocity of 4m/s and deceleration of 4m/ss, then what is the final velocity after travelling 2m?