Question 1

A body starts from rest and acquires a velocity V in time 'T'.The work done on the body in time't' will be proportional to

Accepted Answer

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Answer

https://uploads.quizalize.com/b712470d-67f2-4e38-8b41-8966011fdd37/question/624740e83f320abf8b2c1c896f30fd5ba3c3ab60.png

Answer

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Answer

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Answer

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Question 2

Which of the following statements is correct?

Accepted Answer

B. If there is no friction, moving vehicles can not be stopped even by locking the brakes.

Answer

D. Friction increases the time taken by a body projected upwards to reach the highest point

Answer

A . If there is no friction, work to be done to move a body up an inclined plane will be zero.

Answer

E. All of the above

Answer

C.As the angle of inclination is increased, the normal reaction on the body placed on it increases.

Question 3

A man of mass 60 kg climbs up a 20 m long stair case to reach the top of a building, which is 10 m high. What is work done by him?

Accepted Answer

https://uploads.quizalize.com/b712470d-67f2-4e38-8b41-8966011fdd37/question/952046106ee833ba4d5b55625388b3c62ba47d58.png

Answer

D. 30 KJ

Answer

E.3.3 KJ

Answer

A. 12 KJ

Answer

B. 3 KJ

Question 4

A car running at 25 km/h can be brought to rest by applyingbrakes at a distance of 0.5 m. If the car is running at 75 km/h, how far willit go before coming to rest, if the braking force remains the same?

Accepted Answer

D.None of the above

Answer

C.3 m

Answer

A.1 m

Answer

E.12.5 m

Answer

B.2 m

Question 5

A ball falls from a height of a 20 𝑚 and then bouncesback up to 10 𝑚 height.The loss of energy is:

Accepted Answer

C.50%

Answer

B.25%

Answer

E.100%

Answer

D.75%

Answer

A.5%

Question 6

A truck is 8 times heavier than a car and is moving at half the speed of the car. The amount of work done required to stop the truck as compared to the car is:

Accepted Answer

B. Two times more

Answer

A. Same

Answer

C. Three times more

Answer

E.None of these

Answer

D.Four times more

Question 7

Which of the following remains constant for an isolated system?

Accepted Answer

A. Sum total of kinetic energy and potential energy

Answer

B. Kinetic energy

Answer

C. Kinetic energy and mechanical energy

Answer

E.None of these

Answer

D.Potential energy

Question 8

Which of the following is the correct expression for work 'w',if is the force and is the displacementand angle between and is ?

Accepted Answer

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Answer

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Answer

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Answer

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Answer

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Question 9

An engine pumps out 40 kg of water in one second. The water comes out vertically upwards with a velocity of 3ms^-1. What is the power of engine in kilowatt?

Accepted Answer

C.120 KW

Answer

B.12 KW

Answer

D.12000 KW

Answer

E.1200 KW

Answer

A.1.2 KW

Question 10

A body of mass M is lowered with acceleration g/2 with the help of a string and through a distance l. What is the work done by the string?

Accepted Answer

C. Mgl/2

Answer

B. 3 Mgl/2

Answer

E.2Mgl

Answer

D. Mg1/4

Answer

A. Mgl

Question 11

A girl of weight 400 N climbs up a rope through a height of 8m. The girl takes 20 s to accomplish this task. What is the power expended bythe girl?

Accepted Answer

B.160 W

Answer

C.100 W

Answer

D.800 W

Answer

E.960 W

Answer

A.200 W

Question 12

A body is under the action of two equal and opposite forces,each of 3N and is displaced by 2 m. Which of the following is the value of workdone by the body?

Accepted Answer

B.Zero

Answer

E.1.5 J

Answer

D.- 6 J

Answer

A.+ 6 KJ

Answer

C.3 KJ

Question 13

Which of the following increases with rise in ball that isprojected upwards?

Accepted Answer

A. Momentum

Answer

E. Force

Answer

D. Potential energy

Answer

C. Kinetic energy

Answer

B. Retardation

Question 14

A bullet is fired into a block. Its velocity decreases by 50%,when it penetrates through 9 cm. What will be the total distance penetrated bythe bullet?

Accepted Answer

B.12 cm

Answer

A.10 cm

Answer

C.15 cm

Answer

D.8 cm

Answer

E.18 cm

Question 15

The force of attraction between two objects is called the______.

Accepted Answer

C. gravitational force

Answer

D. centripetal force

Answer

A. electromagnetic force

Answer

B. centrifugal force

Question 16

The magnitude of the momentum of a particle is increased by100%. If the initial kinetic energy is k, what will be the final kinetic energy?

Accepted Answer

C.3 K

Answer

B.4 K

Answer

D.2 K

Answer

A.8 K

Answer

E. K

Question 17

A simple pendulum is vibrating in an evacuated chamber. Itwill oscillate with

Accepted Answer

A.constant amplitude

Answer

D.amplitude, the variation of which cannot be predicted

Answer

B.decreasing amplitude

Answer

C.increasing amplitude

Question 18

What is the power developed by an engine in lifting water of3000 litre from a well 20 m deep in one minute?(1 litre water = 1000 Kg; g = 10m/s²)

Accepted Answer

10KW

Answer

20KW

Answer

13KW

Answer

43KW

Answer

33KW

Question 19

A bomb of 12 kg explodes into two pieces of mass 4 kg and 8kg. The velocity of 8 kg mass is 6 m/s.What is the kinetic energy of the other mass?

Accepted Answer

288 J

Answer

30 J

Answer

24 J

Answer

32 J

Answer

48 J

Question 20

What is the kinetic energy, if the momentum of a body is doubled?

Accepted Answer

It will be increased four times

Answer

It will be doubled

Answer

It will be decreased to half

Answer

It will remain the same

Answer

It will be halved

Question 21

The external force act required to maintain the circular motion of body towards the centre of circular path is ?

Accepted Answer

centripetal force

Answer

non-uniform motion

Answer

uniform motion

Answer

centrifugal force

Question 22

What is the value of gravitation potential energy of the bodyof mass 2 kg, which is projected vertically upwards with a speed of 3 m/s?

Accepted Answer

9 J

Answer

2.25 J

Answer

6 J

Answer

1.8 J

Answer

4.5 J

Question 23

If we throw a body upwards with velocity of 4 ms^-1,at what height does its kinetic energy reduce to half of its initial value?

Accepted Answer

0.4m

Answer

2m

Answer

1m

Answer

None of the above

Answer

4m

Question 24

If the mass of the body is halved and its speed is doubled, what happens to the kinetic energy of the body?

Accepted Answer

it will be doubled

Answer

it will become four times

Answer

it will be halved

Answer

it will remain unchanged

Answer

it will become eight times

Question 25

Two bodies A and B having masses m and M respectively possessthe same momenta. If M > m, and E_A and E_B aretheir kinetic energies, which of the following is true?

Accepted Answer

E_A >E_B

Answer

E_A $\le$ E_B

Answer

EA <EB

Answer

EA =EB

Answer

it can not be predicted

Question 26

Which of the following statements are correct for frictional force?

(a)A frictional force acts in the direction of the motion ofthe object.

(b)Frictional force is a kind of contact force.

(c)It acts in opposite direction of the motion and parallel to the surface incontact.

(d)Frictional force is always a curse in the nature.

Accepted Answer

Only (b) and (c)

Answer

Only (b) and (d)

Answer

Only (a) and (b)

Answer

Only (a) and (c)

Answer

Only (c) and (d)

Question 27

If a car with a mass of 1000 kg attains an acceleration of 5m/s² in 5 seconds after the start, what will be the magnitudeof its momentum?

Accepted Answer

2.5 x 10⁴ kgm/s

Answer

2.5x 10⁵ kgm/s

Answer

2.5x 10² kgm/s

Answer

2.5 x 10³ kgm/s

Answer

2.5x 10⁶ kgm/s

Question 28

If a ball of 20 gm was brought to rest after covering a distance of 50 m moving at a speed of 50 m/s, what was the magnitude of this applied force?

Accepted Answer

0.5 N

Answer

0.05 N

Answer

25 N

Answer

5  N

Answer

50 N

Question 29

Which of the following statements are correct?

(a)A force produces acceleration in the body on which it acts.

(b)A force can change the shape and size of an object.

(c)A force can change the total mass of an object.

(d)The S.I unit of force is Dyne.

Accepted Answer

Only(a) and (b)

Answer

Only (b) and (c)

Answer

Only(a) and (d)

Answer

Only (c) and (d)

Answer

Only (a) and (c)

Question 30

How many dynes are there in force of magnitude 120 N?

Accepted Answer

1.20 x 10⁷ Dyne

Answer

1.20x 10⁴ Dyne

Answer

1.20x 10⁶ Dyne

Answer

0.12 x 10⁷ Dyne

Answer

1.20x 10⁵ Dyne

Question 31

A person is standing in a bus. When the bus starts movingforward suddenly ___________.

Accepted Answer

The person moves backward

Answer

The person moves forward

Answer

Both (B) and (D)

Answer

The person is unaffected

Answer

The person remains stationary

Question 32

Which of the following forces balances a body kept on a table in the state of equilibrium?

Accepted Answer

Normal reaction force

Answer

Force of tension

Answer

Gravitational force

Answer

Restoring force

Answer

Force of friction

Question 33

Which of the following is correctly matched?

(a)Force: Newton

(b)Momentum: kg ms^-1

(c) Acceleration: ms^-1

(d)Torque: Joule

Accepted Answer

Both (a) and (b)

Answer

Both (c) and (d)

Answer

Both (a) and (d)

Answer

Both (b) and (d)

Answer

Both(a) and (c)

Question 34

When we beat a carpet with a stick, then a cloud of dust is observed around it. Which of the following laws clearly explains this phenomenon?

Accepted Answer

Law of inertia

Answer

Law of conservation of energy

Answer

Law of conservation of mass

Answer

Law of conservation of momentum

Answer

Principle of moments

Question 35

On what factors does weight of an object depend?

(a) Mass of the object

(b) Size of the object

(c) Height of the object from ground

(d) Gravitational acceleration

Accepted Answer

Both (a) and (d)

Answer

Both (c) and (d)

Answer

Both (b) and (c)

Answer

Both (a) and (c)

Answer

Both (a) and (b)

Question 36

A body is moving along a straight path. What will happen to the body in the absence of an external field?

Accepted Answer

It will move with the same speed along the same straight path

Answer

None of these

Answer

It will move with a reduced speed along the same path

Answer

It will stop

Answer

It will move at the same speed in a different path

Question 37

Which physical quantity is defined as rate of change of momentum?

Accepted Answer

Force

Answer

Mass

Answer

Acceleration

Answer

Momentum

Answer

Centre of gravity

Question 38

Which of the following pairs of forces are non-contact and repulsive in nature?

Accepted Answer

Electrostatic and magnetic forces

Answer

Electrostatic and gravitational forces

Answer

Gravitational forces and normal reaction

Answer

Friction and tension

Answer

Normal reaction and electrostatic forces

Question 39

2 Nm is equal to

Accepted Answer

2×10⁷ dyne cm

Answer

2×1080

Answer

2×10 dyne cm

Answer

2x10⁸ dyne cm

Question 40

A body is in equilibrium if

Accepted Answer

All force acting on body in opposite direction

Answer

Both (a) & (c)

Answer

All force acting on body in same direction

Answer

All the force acting on body is zero.

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