Forces And Laws Of Motions Test

Forces And Laws Of Motions

This is Forces and Laws of Motions Test-01 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

Identify the incorrect statement

A
Frictional force always acts parallel to the surface of contact.
B
The spring force always pushes a body
Correct
C
The tension of a string always pulls a body
D
The weight of a body always acts towards the centre of the Earth

A unit of force is

A
Newton – m
B
Joule
C
Joule – m
D
Kg \({\text{m}}{{\text{s}}^{ - {\text{2 }}}}\)
Correct

A unit of force is

A
Kg \({\text{m}}{{\text{s}}^{ - {\text{2 }}}}\)
Correct
B
Newton – m
C
Joule
D
Joule – m

\({\text{1}}{0^{\text{5}}}\)dyne is equal to

A
2N
B
1N
Correct
C
1.5N
D
2.5N

A force has

A
both a and b
Correct
B
magnitude only
C
none of these
D
direction only

Statement A: Gravitational force is the weakest force in nature Statement B: Electrostatic force is the example of non – contact force Which of the above two statement is true?

A
neither statement A nor B
B
statement B
C
both the statement a and b
Correct
D
statement A

Ayush hits a cricket ball which than rolls of a level ground after covering a short distance, the ball comes to rest. The ball slows to a stop because

A
Ayush did not hit the ball hard enough
B
There is a force on the ball opposing the motion
Correct
C
Velocity is proportional to the force exerted on the ball.
D
There is no unbalanced force on the ball so the ball would want to come to rest.

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 (C) Act on different objects (D) Scalar quantity

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

Match the following with correct response. (1) Cart pulled by a horse (2) Backward jerk (3) Sole of shoe worn out (4) Recoiling of gun (A) Friction (B) Newton’s III law of motion (C) Law of conservation of momentum (D) Law of inertia

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

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 (C) Decreases friction (D) Force

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

When a force is exerted on an object, it can change its- A State B Position C Shape D Direction

A
(a), (b) and (c) are correct
B
(b) and (c) are correct
C
(a) and (b) are correct
D
All of these
Correct

It is advised to tie any luggage kept on the roof a bus with a rope to avoid the luggage from falling down because of

A
inertia of rest
B
inertia of motion
C
all of these
Correct

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
(a) and (b) are correct
B
(b) and (c) are correct
C
(a), (b) and (c) are correct
Correct
D
All of these

The passenger feels a jerk forward when a bus moving at a high speed suddenly stops. This happens due to

A
inertia of passenger
Correct
B
gravitational pull of the Earth
C
inertia of bus
D
none of these

Weight of a body due to the Earth acts

A
in any direction
B
vertically downwards
Correct
C
vertically upwards
D
horizontal