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

Question # 1

Work done in raising a box depends on:

How fast it is raised A
The strength of the man B
The height by which it is raised C
None of the above 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 stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to

mgh A
1/2 𝑚𝑣² B
zero C
2mgh D

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 9

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 # 10

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 # 11

. 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 # 12

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 # 13

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 # 14

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 # 15

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 # 16

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 # 17

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 # 18

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 # 19

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 # 20

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

Sr.#	Question	Answer
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	A. 1 B. 4/3 C. 16/9 D. none of these
2	If the momentum of a body is increased n times, its kinetic energy increases:	A. n times B. 2 n times C. √𝑛 times D. n 2 time
3	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
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	Which of the following work is greater?	A. + 100J B. 0 J C. - 100J D. Both A and B are equal
6	. 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
7	Which of the following is a unit of energy?	A. unit B. whatt C. Horse Power D. None of the above
8	A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to	A. mgh B. 1/2 𝑚𝑣² C. zero D. 2mgh
9	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
10	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. Mass of the book and time taken B. Weight of the book and height of the book-shelf C. Height of the book-shelf and time taken D. Mass of the book, height of the book-shelf and time taken

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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

Work done in raising a box depends on:

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 stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to

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

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

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 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 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

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

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

. 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.

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

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

The gravity does no work, when the body moves:

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

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

When the velocity of a body is doubled:

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

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)

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:

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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: