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

Question # 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

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

Question # 2

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:

3 × 10⁴ J A
6 × 10⁴J B
9 × 10⁴J C
12× 10⁴ J
D

Question # 3

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 # 4

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 # 5

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 # 6

If the K.E. of a body is increased by 300%, its momentum will increase by:

100 % A
150 % B
√300% C
175 % D

Question # 7

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 # 8

Ratio of dimension of K.E and power is:

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

Question # 9

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 # 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?

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

Question # 11

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 # 12

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 # 13

. 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 # 14

When the velocity of a body is doubled:

Its K.E is doubled A
Its P.E is doubled B
Its momentum is doubled C
Its acceleration is doubled D

Question # 15

Which of the following work is greater?

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

Question # 16

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 # 17

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 # 18

Initially, four identical uniform blocks, each of mass m and thickness h, are spread on a table How much work is done on the blocks in stacking them on top of one another?

2 mgh A
3 mgh B
4mgh C
6mgh D

Question # 19

The body at rest may have:

Energy A
Momentum B
Speed C
Velocity D

Question # 20

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

Sr.#	Question	Answer
1	Initially, four identical uniform blocks, each of mass m and thickness h, are spread on a table How much work is done on the blocks in stacking them on top of one another?	A. 2 mgh B. 3 mgh C. 4mgh D. 6mgh
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	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:	A. 300 N-m B. 420 N-m C. 720 N-m D. none of these
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	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
6	A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct?	A. The kinetic energy of the ball is greatest at the greatest height attained B. The potential energy of the ball increase uniformly with time during the ascent C. By the principle of conservation of momentum. The momentum of the ball is constant throughout its motion D. By the principle of conservation of energy, the total energy of the ball is constant throughout its motion
7	If the K.E. of a body is increased by 300%, its momentum will increase by:	A. 100 % B. 150 % C. √300% D. 175 %
8	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. 20 B. 200 C. 2 D. 10
9	Ratio of dimension of K.E and power is:	A. 1:1 B. T:1 C. 1:T D. M:J
10	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

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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 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 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:

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

The gravity does no work, when the body moves:

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:

If the K.E. of a body is increased by 300%, its momentum will increase by:

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

Ratio of dimension of K.E and power is:

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 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?

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

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 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.

When the velocity of a body is doubled:

Which of the following work is greater?

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:

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

Initially, four identical uniform blocks, each of mass m and thickness h, are spread on a table How much work is done on the blocks in stacking them on top of one another?

The body at rest may have:

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)

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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 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:

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