MCQ PRACTICE

Welcome to your Ncert – class 9- science – Chapter 8 – Force and Laws of Motion 2

Match the following with correct response.

(1) Cause of acceleration

(2) Quantitative measure of inertia

(3) powder applied on carom board

(4) Tyres of vehicles made Rough

(A) Mass

(B) Increases friction

(D) Force

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

None

The people in a bus are pushed backwards when the bus starts suddenly because of

Inertia due to motion

Inertia due to direction

Inertia due to rest

External force

None

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.

0.2 s

0.6 s

0.8 s

0.4 s

None

An Object moving along a straight path with an accelerated motion. The correct statement about the object-

A Its velocity keeps changing

B Its speed keeps changing

C A force is always acting on it

D Its mass keeps on changing

(a) and (b) are correct

(a), (b) and (c) are correct

All of these

(b) and (c) are correct

None

It is due to which of the following reasons that a scooter generally slips on an oily road?

Friction between tyres and road remain same.

Friction between tyres and road increases.

All the above.

Friction between tyres and road decreases.

None

Statement A: Gravitational force is the weakest force in nature.

Statement B: Electrostatic force is an example of non – contact forces.

Which of the above two statements is true?

Statement B is true

Neither statement A nor B are true

Statement A is true

Both the statement a and b are true.

None

A carpenter exerts a force of magnitude 1.5 N at right angles on the surface of a nail of mass 3 gram to drive it into a wooden plank. If the plank offers a resistive force of 0.6 N and the time of interaction of hammer and the nail 0.01 s, the depth through which the nail penetrates is

1.5 cm

15 cm

15m

1.5 mm

None

A force of 10 N acts on a ball moving on a surface. The force of friction that must act between the surface of the ball and the surface so that the ball keeps on moving with constant velocity over the surface must be

10 N

Zero

100 N

20 N

None

Which of the following is true about action and reaction forces acting on two bodies of equal masses?

Action and reaction forces are equal and opposite and produce unequal and opposite acceleration.

Action and reaction forces are equal and opposite and produce equal and opposite acceleration.

Action and reaction forces are unequal and opposite and produce unequal and opposite acceleration.

Action and reaction forces are unequal and opposite and produce equal and opposite acceleration.

None

10.

Two spring balances pull each other in opposite directions. If the reading of one spring balance is 2 N, the reading shown by the second spring balance will be

3.5 N

2 N

2.5 N

4 N

None

11.

If an object moves with a uniform velocity we can conclude that

an unbalanced force acts on the body

there is no force acting on the body

it has uniform acceleration

no unbalanced force acts on it

None

12.

Match the following with correct response.

(1) Action and reaction

(2) Magnitude of force

(3) Momentum

(4) Resultant of balanced force

(A) No acceleration

(B) Newton’s second law

(D) Vector quantity

1-A, 2-C, 3-B, 4-D

1-B, 2-D, 3-A, 4-C

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

None

13.

When a force is exerted on an object, it can change its-

A State

B Position

C Shape

D Direction

All of these

(a), (b) and (c) are correct

(a) and (b) are correct

(b) and (c) are correct

None

14.

Identify the incorrect statement.

The spring force always pushes a body.

The tension of a string always pulls a body.

Frictional force always acts parallel to the surface of contact.

The weight of a body always acts towards the centre of the Earth.

None

15.

Which one is correct if a bullet is fired from a rifle?

Bullet moves in the backward direction and rifle moves in the forward direction.

Rifle moves in the backward direction and bullet moves in the forward direction.

There is no motion of bullet and rifle.

Bullet and rifle both move in the backward direction.

None

Chapter 7 - Motion

Chapter 8-Force and Law of Motion

Chapter 9 - Gravitational

Chapter 10 - Work and Energy

CHAPTER 11 - SOUND

Curriculum

NCERT - Class 9 - Science - PHYSICS

Chapter 7 - Motion

Chapter 8-Force and Law of Motion

Chapter 9 - Gravitational

Chapter 10 - Work and Energy

CHAPTER 11 - SOUND

MCQ PRACTICE – 2