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

Question # 1

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 # 2

Work done in raising a box depends on:

How fast it is raised A
The strength of the man B
The height by which it is raised C
None of the above D

Question # 3

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 # 4

A person holds a bucket of weight 60N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the man is:

300 N-m A
420 N-m B
720 N-m C
none of these D

Question # 5

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 # 6

If the momentum of a body is increased n times, its kinetic energy increases:

n times A
2 n times B
√𝑛 times C
n 2 time D

Question # 7

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 # 8

3 joules of work is done in 3 seconds, then power is:

6 watt A
3 watt B
18 watt C
1 watt D

Question # 9

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 # 10

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 # 11

The energy stored in wound watch spring is

K.E. A
P.E. B
heat energy C
chemical energy D

Question # 12

A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct?

The kinetic energy of the ball is greatest at the greatest height attained A
The potential energy of the ball increase uniformly with time during the ascent B
By the principle of conservation of momentum. The momentum of the ball is constant throughout its motion C
By the principle of conservation of energy, the total energy of the ball is constant throughout its motion D

Question # 13

A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to water flow is 500 N, the power of the boat is

150 KW A
1.5 KW B
heat energy C
chemical energy D

Question # 14

Which of the following is a unit of energy?

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

Question # 15

A man M₁ of mass 80 kg runs up a staircase in 15s. Another man M₂ also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be

1 A
4/3 B
16/9 C
none of these D

Question # 16

A force 𝑭 = (𝟓𝒊̂+ 𝟑𝖩̂) newton is applied over a particle which displaces it from its origin to the point 𝒓 = (𝟐𝒊̂− 𝟏𝖩̂) meters. The work done on the particle is:

– 7 joules A
+13 joules B
+ 7 joules C
+11 joules D

Question # 17

A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is:

10% A
45% B
50% C
75% D

Question # 18

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 # 19

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

Question # 20

If the velocity of a body becomes half, the kinetic energy of body will become

One fourth A
Double B
Four times C
Half D

Sr.#	Question	Answer
1	A man M₁ of mass 80 kg runs up a staircase in 15s. Another man M₂ also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be	A. 1 B. 4/3 C. 16/9 D. none of these
2	Which of the following work is greater?	A. + 100J B. 0 J C. - 100J D. Both A and B are equal
3	Car X is traveling at half the speed of car Y. Car X has twice mass of car Y. Which statement is correct?	A. Car X has half the kinetic energy of car Y B. Car X has one quarter of the kinetic energy of car Y C. Car X has twice the kinetic energy of car Y D. The tow cars have the same kinetic energy
4	If the stone is thrown up vertically and return to ground, its potential energy is maximum	A. during the upward journey B. during the upward journey C. at the maximum height D. at the bottom
5	An engine pumps up 100 kg of water through a height of 10m in 5s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g = 10ms^-2)	A. 33 kW B. 3.3kW C. 0.33kW D. 0.033kW
6	The energy stored in wound watch spring is	A. K.E. B. P.E. C. heat energy D. chemical energy
7	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?	A. 1.2kW B. 120kW C. 12kW D. 1200kW
8	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	A. the path taken by the suitcase B. weight of the suitcase C. initial and final position D. None
9	The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the Stopping distance will be:	A. The same B. Doubled C. Halved D. Four times
10	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?	A. 0 Degree B. 30 Degree C. 60 Degree D. 90 Degree

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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 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?

Work done in raising a box depends on:

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

A person holds a bucket of weight 60N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the man is:

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

If the momentum of a body is increased n times, its kinetic energy increases:

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

3 joules of work is done in 3 seconds, then power is:

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

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

The energy stored in wound watch spring is

A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct?

A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to water flow is 500 N, the power of the boat is

Which of the following is a unit of energy?

A man M1 of mass 80 kg runs up a staircase in 15s. Another man M2 also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be

A force 𝑭 = (𝟓𝒊̂+ 𝟑𝖩̂) newton is applied over a particle which displaces it from its origin to the point 𝒓 = (𝟐𝒊̂− 𝟏𝖩̂) meters. The work done on the particle is:

A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is:

The gravity does no work, when the body moves:

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

If the velocity of a body becomes half, the kinetic energy of body will become

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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 man M₁ of mass 80 kg runs up a staircase in 15s. Another man M₂ also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be