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# Laws of motion - MCQ test 1

Laws of motion Class 11 CBSE - MCQ test 1

Question:1

The unit of Newton is equivalent to:

Kg m/s²

Kgm/s

Kg/m/s²

None

Question:2

1Kg-wt is equal to :

98N

1N

9.8

None

Question:3

Which of following is an example of variable mass system:

A bicycle moving

A rocket taking off

None

Question:4

How do you calculate force in variable mass system with constant velocity.

using F=ma

using F=vdm/dt

using F=m/t

None

Question:5

A feather of mass 5g is dropped from height.It is found to fall down with constant velocity.What is the net force acting on it?

0N

9.8N

98N

None

Question:6

What is the force applied on a body with 5 kg of mass and an acceleration of 7 m/s2?

3.5N

35N

355N

None

Question:7

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

Its speed is changing.

It is going away from the Earth.

A force is always acting on it.

Its velocity is changing.

Question:8

According to Newton`s second law of motion , Acceleration produced in an object is :

Directly proportional to force applied.

Inversaly proportional to mass of object

Both a & b

None

Question:9

The second law of motion gives the measure of which of the following?

Acceleration

Force

Momentum

Mass

Question:10

An object will possess uniform motion as long as the:

Resultant force acting on it begins to decrease.

Resultant force acting on it begins to increase .

Resultant force acting on it is zero.

None

Question:11

A force of 5N produces an acceleration of 10m/s^2 in an object of mass m1 and produces an acceleration of 20 m/s^2 in an object of mass m2.What would be the acceleration if both masses combined.

0.5 m/s^2

0.25 m/s^2

6.6 m/s^2

None

Question:12

A force of 100 dyne act on a mass of 5g for 10 sec. The velocity produced is :

2 cm/sec

20 cm/sec

200 cm/sec

None of these

Question:13

Newton,s first law of motion gives the concept of :

Mass

Inertia

Force

None

Question:14

A body of mass 2 kg is moving with velocity 8m/s on a smooth surface.If it is brought to restin 4 secthen the force applied on it is:

8N

6N

4N

2N

Question:15

What is the net force of a kite that is held stationary in the sky?

Increasing

Decreasing

zero

None

Question:16

When an external force is not applied to the system, its total momentum:

3 unit

4 unit

5 unit

None of these

Question:17

If the force acting on the body is zero. Its momentum is:

Becomes zero

Remains constant

None

Question:18

Two balls A and B, of masses m and 2m are in motion with velocities 2v and v respectively. Compare the force needed to stop them in the same time.

2:1

1:2

3:1

1:1

Question:19

What force can change the velocity of a body of mass 1kg from 20 m/s to 30m/s in two seconds?

20N

30N

40N

10N

Question:20

Find the time for which a force of 1kgwt acts on a body of mass 1 kg moving with a uniform speed of 4m/s to stop the body.

0.1S

0.2S

0.3S

0.4S