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

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

Ratio of dimension of K.E and power is:

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

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 # 8

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 # 9

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 # 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

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 # 12

A body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio

1: 2 A
1: 1 B
2: 1 C
4: 1 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

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 # 15

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 # 16

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 # 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

The energy stored in wound watch spring is

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

Question # 19

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 # 20

The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?

9 ms^-1 A
3 ms^-1 B
2 ms-1 C
1 ms^-1 D

Sr.#	Question	Answer
1	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
2	3 joules of work is done in 3 seconds, then power is:	A. 6 watt B. 3 watt C. 18 watt D. 1 watt
3	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
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 body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio	A. 1: 2 B. 1: 1 C. 2: 1 D. 4: 1
6	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	A. 324 J B. 256 J C. 245 J D. 524 J
7	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
8	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. Zero B. 9.8 J C. 19.6 J D. 329 J
9	Work done in raising a box depends on:	A. How fast it is raised B. The strength of the man C. The height by which it is raised D. None of the above
10	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. 10J B. 270 J C. 90J D. 180 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

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:

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

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:

When the velocity of a body is doubled:

Ratio of dimension of K.E and power is:

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

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 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 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

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

A body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio

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

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

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?

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 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.

The energy stored in wound watch spring 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 momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?

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Test Questions

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

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 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