ECAT Pre General Science Physics Chapter 4 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 4 Work and Energy

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ECAT Pre General Science Physics Chapter 4 Work and Energy

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Question # 1

Work is a always done on a body when

Question # 2

Work has the dimensions as that of

Question # 3

The field in which work done is moving body between two points depends upon the path followed is called:

Question # 4

The value of escape velocity of Earth planet comes out to be:

Question # 5

Work has a dimension as that of:

Question # 6

Work is always done on a body when:

Question # 7

Work done on a body by gravity in lifting it up to certain height is

Question # 8

The types of mechanical energy is/are:

Question # 9

A solar cell is made from:

Question # 10

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

Question # 11

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

Question # 12

Work done by the force of friction is always

Question # 13

The space around the earth within it exerts a force of attraction on other bodies of known as:

Question # 14

A laborer carrying a load on his head moves from the rest on a horizontal road to another point where he comes to rest. He has done:

Question # 15

Work is a:

Question # 16

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

Question # 17

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

Question # 18

Work is product of:

Question # 19

Work has the dimension as that of:

Question # 20

A field in which the work done is moving a body along closed path is zero is called:

Question # 21

If one newton force acts on a body and displaces the body through 1m work done on body is

Question # 22

The space around the earth in which its gravitational force acts on a body is called

Question # 23

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

Question # 24

Work is always done on a body when:

Question # 25

The work performed on an object does not depend on

Question # 26

Work done is maximum when angle between force and displacement is

Question # 27

Which force is not a conservative force?

Question # 28

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

Question # 29

A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:

Question # 30

Which of the following types of force can do no work on the particle on which it acts

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Sr. # Question Answer
1 The tidal energy is due to gravitational pull of :

A. sun

B. moon

C.Mars

D. None of these

2 The work done by a force keeping an object in circular motion with constant speed is:

A. Zero J.

B. 0.1 J

C.1 J

D. 0.01 J

3 The work performed on an object does not depend on:

A. Force applied

B. Angle at which force is inclined to the displacement

C.Initial velocity of the object

D. Displacement

4 When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

A. Positive

B. Negative

C.Zero

D. None of these

5 Maximum work is done when force and displacement are

A. Parallel

B. Antiparallel

C.Perpendicular

D. Both a and b

6 Watt x second is unit of:

A. Force

B. Work

C.Power

D. None of these

7 Energy stored in the spring of a watch is called

A. Potential energy

B. Kinetic energy

C.Nuclear energy

D. Elastic potential

8 Work is a scalar product of

A. Force, Velocity

B. Velocity, Displacement

C.Force, Displacement

D. Force, Momentum

9 Which of the following type of force can do no work on the particle on which it acts:

A. Frictional force

B. Gravitational force

C.Electric force

D. Centripetal force

10 Work-energy principle states that work done on the body by applied force is equal to change in:

A. Potential energy

B. Kinetic nergy

C.Linear momentum

D. None of these

11 A field in which the work done in moving a body along closed path is zero is called

A. Nuclear Field

B. Conservative field

C.Gravitational field

D. Non-conservative field

12 Work is always done on a body when:

A. A force acts on it

B. It moves through certain distance

C.None of A or B is correct

D. Both A and B is correct

13 1 J = ________?

A. 107erges

B. 10-7erges

C.105erges

D. 10-5erges

14 Which one is conservative force

A. Electric force

B. Frictional force

C.Normal force

D. Air resistance

15 The work done on the body will be zero if:

A. No force is applied on the body

B. Force is applied but no displacement

C.Angle between F(force) and d(displacement) is 90°

D. All of these are correct

16 The types of mechanical energy is/are:

A. Kinetic energy

B. Potential energy

C.Both of these

D. None of these

17 A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

A. Zero

B. 10.2 J

C.100 J

D. 980 J

18 The work done moving a body between two points in a conservation field is independent of the:

A. Direction

B. Force applied

C.Path followed by the body `

D. Power

19 When two protons are brought are brought closer potential energy of both of them:

A. Increases

B. Decreases

C.Remains same

D. None of these

20 A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

A. 0°

B. 30°

C.60°

D. 90°

21 Which force is not a conservative force:

A. Frictional force

B. Gravitational force

C.Electric force

D. Elastic spring force

22 Escape velocity from surface of Moon as compared to that from Earth surface is:

A. Greater

B. Smaller

C.Equal

D. None of thes

23 Teh consumption of energy by a 1000 watt heater in half an hour is:

A. 5 Kwh

B. 0.5 Kwh

C.2.5 Kwh

D. 3.2 Kwh

24 In the force applied is parallel to the direction of motion, then work done is:

A. Maximum

B. Minimum

C.Zero

D. None of these

25 Work done is lowering the bucket into the well is:

A. Zero

B. Positive

C.Negative

D. None of these

26 A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done in 25J. The angle which the force makes with the direction of motion will be

A. 60°

B. 90°

C.30°

D. 0°

27 The power of an electric generating station is expressed in:

A. Kilo Jule

B. Kilowatt-hour

C.Kilo watt

D. Watt

28 The tidal energy is produced due to rotation of Earth relative to:

A. Moon

B. Sun

C.Oceans

D. Water

29 The space around the earth within which it expects a force of attraction on other bodies is known as:

A. Nuclear field

B. Conservative field

C.Electric field

D. Gravitational field

30 A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is:

A. 1.25 J

B. 12.5 J

C.125 J

D. None of these

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