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

Question # 1

A light and a heavy body have equal momenta. Which one has greater K.E?

The light body A
The heavy body B
The K.E are equa C
Data is incomplete D

Question # 2

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 # 3

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 # 4

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 # 5

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 # 6

Which of the following types of force can do no work on the particle on which it acts?

Frictional force A
Gravitational force B
Elastic force C
Centripetal force D

Question # 7

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 # 8

Ratio of dimension of K.E and power is:

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

Question # 9

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 # 10

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 # 11

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 # 12

The body at rest may have:

Energy A
Momentum B
Speed C
Velocity D

Question # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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 # 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

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

Sr.#	Question	Answer
1	The energy which an -e acquires when accelerated through a potential difference of 1 volt is called?	A. 1 Joule B. 1 Electron volt C. 1 Erg D. 1 Watt
2	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
3	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
4	A light and a heavy body have equal momenta. Which one has greater K.E?	A. The light body B. The heavy body C. The K.E are equa D. Data is incomplete
5	3 joules of work is done in 3 seconds, then power is:	A. 6 watt B. 3 watt C. 18 watt D. 1 watt
6	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
7	The body at rest may have:	A. Energy B. Momentum C. Speed D. Velocity
8	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%
9	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. – 7 joules B. +13 joules C. + 7 joules D. +11 joules
10	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

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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 light and a heavy body have equal momenta. Which one has greater K.E?

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 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 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

Which of the following types of force can do no work on the particle on which it acts?

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:

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

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

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

The body at rest may have:

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

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

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

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

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:

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

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

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

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Test Questions

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: