MDCAT Physics Chapter 3 online mcq test with answers for chapter 3 (Rotational and Circular Motion)

Question # 1

An elevator's motor produces 3000 W power. The speed With Which it can lift a 1000 kg load is:

30.6ms^-1 A
0.306ms^-1 B
3.06ms^-1 C
300.3ms^-1 D

Question # 2

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?

1.2kW A
120kW B
12kW C
1200kW D

Question # 3

In a gravitational field when work done by gravity is negative then

P.E increases A
P.E decrease B
None C
P.E remains same D

Question # 4

A man pushes a wall and fails to displace it. He does:

Negative work A
Positive but not maximum work B
No work at all C
Maximum work D

Question # 5

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 joules, the angle which the force makes with the direction of motion of the body is?

0 Degree A
30 Degree B
60 Degree C
90 Degree D

Question # 6

Car X is traveling at half the speed of car Y. Car X has twice mass of car Y.
Which statement is correct?

Car X has half the kinetic energy of car Y A
Car X has one quarter of the kinetic energy of car Y B
Car X has twice the kinetic energy of car Y C
The tow cars have the same kinetic energy D

Question # 7

The gravity does no work, when the body moves:

Horizontally A
Vertically upwards B
Vertically downward C
At an angle of 45o with horizontal D

Question # 8

Which of the following work is greater?

+ 100J A
0 J B
- 100J C
Both A and B are equal D

Question # 9

A force of 6 N act horizontally on a stationary mass of 2kg for 4s. The kineticenergy in joule is

12 A
72 B
56 C
888 D

Question # 10

Ratio of dimension of K.E and power is:

1:1 A
T:1 B
1:T C
M:J D

Question # 11

A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to

mgh A
1/2 𝑚𝑣² B
zero C
2mgh D

Question # 12

You lift a suit case from the floor and keep it on a table. The work done by you on the suitcase does not depend on

the path taken by the suitcase A
weight of the suitcase B
initial and final position C
None D

Question # 13

Which of the following is a unit of energy?

unit A
whatt B
Horse Power C
None of the above D

Question # 14

A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of P.E will be:

Zero A
9.8 J B
19.6 J C
329 J D

Question # 15

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms¹ The KE of other mass is

324 J A
256 J B
245 J C
524 J D

Question # 16

If the stone is thrown up vertically and return to ground, its potential energy is maximum

during the upward journey A
during the upward journey B
at the maximum height C
at the bottom D

Question # 17

You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon:

Mass of the book and time taken A
Weight of the book and height of the book-shelf B
Height of the book-shelf and time taken C
Mass of the book, height of the book-shelf and time taken D

Question # 18

The body at rest may have:

Energy A
Momentum B
Speed C
Velocity D

Question # 19

When a person lifts a body from ground work done by lifting force is?

Positive A
Negative B
Zero C
Half of positive maximum D

Question # 20

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor in watts is

20 A
200 B
2 C
10 D

Sr.#	Question	Answer
1	If the velocity of a body becomes half, the kinetic energy of body will become	A. One fourth B. Double C. Four times D. Half
2	In a gravitational field when work done by gravity is negative then	A. P.E increases B. P.E decrease C. None D. P.E remains same
3	You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon:	A. Mass of the book and time taken B. Weight of the book and height of the book-shelf C. Height of the book-shelf and time taken D. Mass of the book, height of the book-shelf and time taken
4	An elevator's motor produces 3000 W power. The speed With Which it can lift a 1000 kg load is:	A. 30.6ms^-1 B. 0.306ms^-1 C. 3.06ms^-1 D. 300.3ms^-1
5	A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to	A. mgh B. 1/2 𝑚𝑣² C. zero D. 2mgh
6	A man pushes a wall and fails to displace it. He does:	A. Negative work B. Positive but not maximum work C. No work at all D. Maximum work
7	A person weighing 20 mg walks on a level platform with a speed of 2 ms-1 . The work by the person against the force of gravity is:	A. Zero B. 2J C. 60J D. 600J
8	The gravity does no work, when the body moves:	A. Horizontally B. Vertically upwards C. Vertically downward D. At an angle of 45o with horizontal
9	A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is:	A. 10% B. 45% C. 50% D. 75%
10	A man weighing 500 N carries a load of 10 kg to the top of a building in 4 minutes. The work done by the man is 6 × 𝟏𝟎⁴ J. If he carries the same load in 8 minutes, the work done by the man will be:	A. 3 × 10⁴ J B. 6 × 10⁴J C. 9 × 10⁴J D. 12× 10⁴ J

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MDCAT Physics Chapter 3 MCQ Test With Answer for ( Work ,Energy & Power)

MCQ's Test For MDCAT Physics Chapter 3 Work ,Energy & Power Online Test

MDCAT Physics Chapter 3 Work ,Energy & Power Online Test

An elevator's motor produces 3000 W power. The speed With Which it can lift a 1000 kg load is:

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?

In a gravitational field when work done by gravity is negative then

A man pushes a wall and fails to displace it. He does:

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 joules, the angle which the force makes with the direction of motion of the body is?

Car X is traveling at half the speed of car Y. Car X has twice mass of car Y.Which statement is correct?

The gravity does no work, when the body moves:

Which of the following work is greater?

A force of 6 N act horizontally on a stationary mass of 2kg for 4s. The kineticenergy in joule is

Ratio of dimension of K.E and power is:

A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to

You lift a suit case from the floor and keep it on a table. The work done by you on the suitcase does not depend on

Which of the following is a unit of energy?

A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of P.E will be:

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms1 The KE of other mass is

If the stone is thrown up vertically and return to ground, its potential energy is maximum

You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon:

The body at rest may have:

When a person lifts a body from ground work done by lifting force is?

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor in watts is

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Car X is traveling at half the speed of car Y. Car X has twice mass of car Y.
Which statement is correct?

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms¹ The KE of other mass is