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 done in lower and bucket into the well is:

Question # 2

Maximum work is done when force and displacement are

Question # 3

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

Question # 4

The commercial unit of electrical energy is :

Question # 5

The consumption of energy by a 60 W bulb in 2 minutes is:

Question # 6

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

Question # 7

If force and displacement are in opposite direction, the work done is taken as:

Question # 8

Work done is independent of path followed in _______

Question # 9

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

Question # 10

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

Question # 11

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

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

Question # 17

Work done by the force of friction is always

Question # 18

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 # 19

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 # 20

Power is a :

Question # 21

Work done is maximum when angle between force and displacement is:

Question # 22

When a falling body hits ground, its KE changes to _____ energy.

Question # 23

Work is a always done on a body when

Question # 24

Work done is maximum when angle between force and displacement is:

Question # 25

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 # 26

Which force is not a conservative force:

Question # 27

The dimensions of work

Question # 28

Work done is lowering the bucket into the well is:

Question # 29

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

Question # 30

The tidal energy is due to gravitational pull of :

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Sr. # Question Answer
1 Work done is lowering the bucket into the well is:

A. Zero

B. Positive

C.Negative

D. None of these

2 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

3 When velocity of moving body is doubled, the quantity which is also doubled is its:

A. K.E.

B. Acceleration

C.Momentum

D. P.E.

4 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:

A. Power

B. Work

C.Pressure

D. None of these

5 Work done in lower and bucket into the well is:

A. Zero

B. Positive

C.Negative

D. None of these

6 Work done by the force of friction is always

A. Positive

B. Zero

C.Negative

D. Maximum

7 The ultimate source of money sources of energy is:

A. Sun

B. Air

C.Water

D. Petroleum

8 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

9 Work is a

A. Scalar quantity

B. Vector quantity

C.Base quantity

D. None of these

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

A. Electric Field

B. Gravitational field

C.Magnetic field

D. Conservative field

11 If force and displacement are in opposite direction, the work done is taken as

A. Positive work

B. Negative work

C.Zero work

D. Infinite work

12 The energy stored int he water of the dam is:

A. Electric energy

B. Kinetic energy

C.Potential energy

D. None of these

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

A. Nuclear filed

B. Conservative field

C.Gravitational field

D. Non-conservative field

14 When a body 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

15 Which force is not a conservative force?

A. Frictional force

B. Gravitational force

C.Electric force

D. Elastic spring force

16 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

17 Which of the following is not a unit of power:

A. J-sec

B. Watt

C.N m/sec

D. Horsepower

18 The commercial unit of electrical energy is :

A. K Watt

B. KWH

C.Horse power

D. Joule

19 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

20 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

21 When a wall is pushed by a person very strongly, he has done:

A. Maximum work

B. Zero work

C.Positive work

D. Negative work

22 Power is a :

A. Vector quantity

B. Base quantity

C.Scalar quantity

D. None of these

23 Which one is conservative force

A. Electric force

B. Frictional force

C.Normal force

D. Air resistance

24 Work done along a closed path in a gravitational field is:

A. Maximum

B. Minimum

C.Zero

D. Unity

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

A. Zero J

B. 1 J

C.0.1 J

D. 0.01 J

26 A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, which makes and 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

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

A. 0°

B. 30°

C.60°

D. 90°

28 The unit of work in CGS system is

A. Joule

B. Erg

C.Dyne

D. Watt

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

A. Kilo Jule

B. Kilowatt-hour

C.Kilo watt

D. Watt

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

A. Conservative field

B. Non-conservative field

C.Electric field

D. None of these

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