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# Laws of motion MCQ test 2

Laws of motion Class 11 CBSE - MCQ test 2

Question:1

Passengers are pushed back when a car starts abruptly. Which of the following laws of motion explain it?

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

None

Question:2

The ............ of a body is equivalent to the ratio of the force acting on it to the acceleration it generates.

Momentum

Impulse

Inertial Mass

None of these

Question:3

Passengers on a bus travelling at a constant speed is pushed backward, When the bus accelerates forward abruptly.This force is referred to as

Gravitational Force

Magnetic Force

Fictitious/Pseudo Force

None of these

Question:4

If the force applied to a body is doubled and the mass is cut in half, What would be the accelerations’ ratio?

2:2

1:2

4:2

1:4

Question:5

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.The above statement is

Law of inertia

Newton's first law of motion

Both A snd B

None of these

Question:6

If a body’s net external force is zero, it has

Zero velocity

Zero acceleration

Non zero acceleration

None of these

Question:7

What are the components required to calculate the momentum of a body?

Mass & acceleration

Mass & Velocity

Force & Time

None of these

Question:8

The quicker the momentum changes

The force is less.

The force is zero.

The force is greater.

None of these

Question:9

A body’s rate of change of momentum is:

Directly proportional to acceleration.

Directly proportional to appled force.

Inversely proportional to applied force.

None of these

Question:10

The rate at which a body’s momentum changes is proportional to the force applied and occurs in the direction in which the force is applied.This is:

Law of inertia

First law of motion

Second law of motion

Third law motion

Question:11

The component of contact force that is perpendicular to the surface in contact is referred to as:

Frictional force

Normal force

Perpendicular force

None of these

Question:12

Inertia is the property of a body linked to tendency of a body

Change of position

Change of direction

Resist the state of rest or uniform motion

None of these

Question:13

When a ball of mass 5 kg hits a bat with velocity 3m/s in positive direction and it move back with a velocity 4m/s.What would be the impulse?

5N

35N

25N

None of these

Question:14

A particle of mass m has momentum p.Its kinetic energy will be

mp

p²/m

p²/2m

p²m

Question:15

A particle of mass m at rest is acted upon by a constant force F for time t.What would be kinetic energy after time t:

F²t²/m

F²t²/3m

F²t²/2m

None of these

Question:16

Force depends on :

change in momentum

how fast the change in momentum is brought about

Both (a) & (b)

None of these

Question:17

Which motion does not require force to maintain it ?

Uniform circular motion

Elliptical motion

Uniform straight line motion

Projectile motion

Question:18

A jet engine works on the principle of

conservation of mass

conservation of energy

conservation of angular momentum

conservation of linear momentum

Question:19

A reference frame attached to the earth

is an inertial frame

cannot be an inertial frame because earth is revolving round the sun

is an inertial frame because Newton’s laws are applicable

is an inertial frame because the earth is rotating about its own axis

Question:20

A man is standing at the centre of frictionless pond of ice. How can he get himself to the shore?

By throwing his shirt in vertically upward direction

He will wait for the ice to melt in pond

Unable to get at the shore

By spitting horizontally