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# Laws of motion MCQ test 3

Laws of motion Class 11 CBSE - MCQ test 3

Question:1

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downwards with an acceleration of 5 m/s, the reading of the spring balance will be

Less than 49N

More than 49N

Remains same.

None

Question:2

Which physical quantity is found from the area under force-time graph?

Momentum

Impulse

Inertial Mass

None of these

Question:3

Two objects having different masses have same momentum. Which one of them will move faster?

Both will move with same speed

Object with heavier mass

Object with smaller mass.

None of these

Question:4

An athelete runs some distance before taking a jump.

To warm up the body

Just for entertainment & Nothing

To increase momentum for long jump

None of these

Question:5

A bus weighing 1000 kg is at rest on the bus stand. What is the linear momentum of the bus?

Positive

Negative

Zero

None of these

Question:6

If the tension in the cable supporting an elevator is equal to the weight of the elevator, the elevator may

go up with non uniform velocity.

go up with uniform velocity.

go dowardd with non zero acceleration

None of these

Question:7

The physical quantity which is equal to the change in momentum of a body is known

Mass & acceleration

Force

Momentum

None of these

Question:8

When the body is in motion its always change its?

Velocity

Direction

Position vector

None of these

Question:9

The body moving with uniform velocity changes its?

Acceleration

Displacement

Speed

None of these

Question:10

Inertia of an object is quantitative measure of ...

Density

Pressure

Mass

Velocity

Question:11

Which of the following have always same in direction?

Force and velocity

Force and acceleration

Force and momentum

None of these

Question:12

A force of 10N acts on a body of mass 20kg for 10 seconds. The change in its momentum is:

50 Kgm/s

75 Kgm/s

100 Kgm/s

None of these

Question:13

A force of 100 N acts on a body mass 2 kg for 10 s. The change in the velocity of the body is:

100m/s

500m/s

200m/s

None of these

Question:14

The same force for the same time causes the _____ change in momentum for different bodies

Diffrent

Greater

Same

None of these

Question:15

The second law of motion can be stated as:

F = k*(dv/dt)

F = k*(dm/dt)

F = k*(dp/dt)

None of these

Question:16

In the second law, if F= 0 then

Acceleration = 0

Mass = 0

Velocity = 0

None of these

Question:17

Equilibrium of a particle in mechanics refers to the situation when

Net external force in the particle is non zero

Net external force on the particle is zero

Both a and b

None of these

Question:18

Force on a body A by body B is ______ to the force on the body B by A.

Opposite

Equal

Equal and opposite

None

Question:19

Which of the following has the greatest inertia?

A single atom

A molecule

A one-rupee coin

A cricket ball

Question:20

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

Mass and acceleration

Displacement and mass

Force and time

Velocity and mass