ECAT Pre General Science Physics Chapter 4 MCQ Test With Answer

Question # 1

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

Conservative field A
Non-conservative field B
Electric field C
None of these D

Question # 2

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:`

Minimum work A
Maximum work
B
Zero work C
Negative work D

Question # 3

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:

+5 X 10¹J A
+5 X 10²J B
+5 X 10³J C
+5 X 10⁴J D

Question # 4

Energy stored in the spring of a watch is called

Potential energy A
Kinetic energy B
Nuclear energy C
Elastic potential D

Question # 5

Work has a dimension as that of:

Torque A
Angular momentum B
Linear momentum C
Power D

Question # 6

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

5 Kwh A
0.5 Kwh B
2.5 Kwh C
3.2 Kwh D

Question # 7

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

Maximum A
Minimum B
Zero C
Unity D

Question # 8

Work done is maximum when angle between force and displacement is

0° A
90° B
180° C
None of these D

Question # 9

Work is always done on a body when:

A force acts on it A
It moves through certain distance B
None of A or B is correct C
Both A and B is correct D

Question # 10

Work is a always done on a body when

A force acts on it A
It moves through certain distance B
None of A or B is correct C
Both A and B are correct D

Question # 11

Work is product of:

Force and velocity A
Heat and energy B
Force and displacement C
None of these D

Question # 12

Which of the following is not a unit of power:

J-sec A
Watt B
N m/sec C
Horsepower D

Question # 13

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

mgh A
Its wight B
Weight X height C
Zero D

Question # 14

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

Zero J A
1 J B
0.1 J C
0.01 J D

Question # 15

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

Zero A
10.2 J B
100 J C
980 J D

Question # 16

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:

0° A
30° B
60° C
90° D

Question # 17

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

1 dyne A
1 joule B
1KJ C
1 Watt D

Question # 18

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

Positive A
Negative B
Zero C
None of these D

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:

Power A
Work B
Pressure C
None of these D

Question # 20

The work performed on an object does not depend on:

Force applied A
Angle at which force is inclined to the displacement B
Initial velocity of the object C
Displacement D

Question # 21

The types of mechanical energy is/are:

Kinetic energy A
Potential energy B
Both of these C
None of these D

Question # 22

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

Zero A
10.2 J B
100 J C
980 J D

Question # 23

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

Positive work A
Negative work B
Zero work C
Infinte work D

Question # 24

Work is a Quantity

Vector A
Scalar B
Non-physical C
None of these D

Question # 25

1 J = ________?

10⁷erges A
10^-7erges B
10⁵erges C
10^-5erges D

Question # 26

The dimensions of work

[MLT^-1] A
[MLT^-2] B
[ML²T^-2] C
[MLT] D

Question # 27

Work has the dimensions as that of

Torque A
Angular momentum B
Linear momentum C
Power D

Question # 28

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

Zero J. A
0.1 J B
1 J C
0.01 J D

Question # 29

The tidal energy is due to gravitational pull of :

sun A
moon B
Mars C
None of these D

Question # 30

The Space around the Earth within which it exerts a force of attraction on other bodies is known as

Nuclear field A
Conservative field B
Electric field C
Gravitational field D

Sr.#	Question	Answer
1	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.
2	The unit of work in CGS system is	A. Joule B. Erg C. Dyne D. Watt
3	Work has the dimensions as that of	A. Torque B. Angular momentum C. Linear momentum D. Power
4	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:	A. +5 x 10¹J B. +5 x 10²J C. +5 x 10³J D. +5 x 10⁴J
5	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
6	Which of the following is not a unit of power:	A. J-sec B. Watt C. N m/sec D. Horsepower
7	The Space around the Earth within which it exerts a force of attraction on other bodies is known as	A. Nuclear field B. Conservative field C. Electric field D. Gravitational field
8	When force and displacement are perpendicular to each other than work is equal to	A. Unity B. Infinity C. Zero D. -Fd
9	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
10	Work is a scalar product of	A. Force, Velocity B. Velocity, Displacement C. Force, Displacement D. Force, Momentum

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