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

Question # 1

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

In an explosion a body breaks up into two pieces of unequal masses. In this:

Both parts will have numerically equal momentum A
Lighter part will have more momentum B
Heavier part will have more momentum C
Both parts will have equal kinetic energy D

Question # 7

A man pushes a wall and fails to displace it. He does:

Negative work A
Positive but not maximum work B
No work at all C
Maximum work D

Question # 8

The body at rest may have:

Energy A
Momentum B
Speed C
Velocity D

Question # 9

Which of the following is a unit of energy?

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

Question # 10

The energy stored in wound watch spring is

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

Question # 11

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 # 12

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 # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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

Question # 19

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 # 20

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

Sr.#	Question	Answer
1	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
2	An elevator's motor produces 3000 W power. The speed With Which it can lift a 1000 kg load is:	A. 30.6ms^-1 B. 0.306ms^-1 C. 3.06ms^-1 D. 300.3ms^-1
3	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
4	The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?	A. 9 ms^-1 B. 3 ms^-1 C. 2 ms-1 D. 1 ms^-1
5	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
6	Which of the following is a unit of energy?	A. unit B. whatt C. Horse Power D. None of the above
7	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
8	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
9	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
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

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

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

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

In an explosion a body breaks up into two pieces of unequal masses. In this:

A man pushes a wall and fails to displace it. He does:

The body at rest may have:

Which of the following is a unit of energy?

The energy stored in wound watch spring 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:

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

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

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

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

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

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?

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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 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