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

Question # 1

A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

5 J A
350 J B
100 J C
3430 J D

Question # 2

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 # 3

The time taken by an engine of power 10 kW to lift a mass of 200 kg to a heightof 40 m is (g + 10ms2)

2 sec A
4 sec B
8 sec C
16sec D

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

The power needed to lift amass of 5000g to height of 1min 2 second is

2.45 watt A
24.5 watt B
245 watt C
2.45 k watt D

Question # 9

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 # 10

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 # 11

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 # 12

Kinetic energy of a body moving with speed of 10 ms-1 is 30 J. If its speed becomes30 ms-1 then its K.E becomes

10J A
270 J B
90J C
180 J D

Question # 13

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:

Zero A
2J B
60J C
600J D

Question # 14

The body at rest may have:

Energy A
Momentum B
Speed C
Velocity D

Question # 15

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

Question # 16

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 # 17

. A force "F1" acts on a body through distance "S1" in the direction of motion and does work "W1". Similarly another force "F2" act on same body through distance "S2" but in opposite to the direction of motion and does work "W2". Now if F1 = F2 and S1 = S2 then which statement is correct.

W1 = W2 A
W2< W2 B
W1 > W2 C
W1 = W2= 0 D

Question # 18

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 # 19

Ratio of dimension of K.E and power is:

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

Question # 20

The energy which an -e acquires when accelerated through a potential difference of 1 volt is called?

1 Joule A
1 Electron volt B
1 Erg C
1 Watt D

Sr.#	Question	Answer
1	When a person lifts a body from ground work done by lifting force is?	A. Positive B. Negative C. Zero D. Half of positive maximum
2	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
3	A force of 6 N act horizontally on a stationary mass of 2kg for 4s. The kineticenergy in joule is	A. 12 B. 72 C. 56 D. 888
4	. A force "F1" acts on a body through distance "S1" in the direction of motion and does work "W1". Similarly another force "F2" act on same body through distance "S2" but in opposite to the direction of motion and does work "W2". Now if F1 = F2 and S1 = S2 then which statement is correct.	A. W1 = W2 B. W2< W2 C. W1 > W2 D. W1 = W2= 0
5	Which of the following is a unit of energy?	A. unit B. whatt C. Horse Power D. None of the above
6	A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is	A. 5 J B. 350 J C. 100 J D. 3430 J
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	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
9	When the velocity of a body is doubled:	A. Its K.E is doubled B. Its P.E is doubled C. Its momentum is doubled D. Its acceleration is doubled
10	3 joules of work is done in 3 seconds, then power is:	A. 6 watt B. 3 watt C. 18 watt D. 1 watt

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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

A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

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

The time taken by an engine of power 10 kW to lift a mass of 200 kg to a heightof 40 m is (g + 10ms2)

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

The gravity does no work, when the body moves:

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:

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 power needed to lift amass of 5000g to height of 1min 2 second 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

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

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

Kinetic energy of a body moving with speed of 10 ms-1 is 30 J. If its speed becomes30 ms-1 then its K.E becomes

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:

The body at rest may have:

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

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

. A force "F1" acts on a body through distance "S1" in the direction of motion and does work "W1". Similarly another force "F2" act on same body through distance "S2" but in opposite to the direction of motion and does work "W2". Now if F1 = F2 and S1 = S2 then which statement is correct.

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

Ratio of dimension of K.E and power is:

The energy which an -e acquires when accelerated through a potential difference of 1 volt is called?

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Test Questions

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