Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

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

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

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

D
1-C, 2-B, 3-D, 4-A
Question 2
1 / -0

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

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

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

D
1-D, 2-A, 3-C, 4-B
Question 3
1 / -0

Identify the incorrect statement.

A
The spring force always pushes a body.

B
Frictional force always acts parallel to the surface of contact.

C
The tension of a string always pulls a body.

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

Solution

Explanation:

The spring force is the force exerted by a compressed or stretched spring upon any object that is attached to it. An object that compresses or stretches a spring is always acted upon by a force that restores the object to its rest or equilibrium position. So, the spring force does not always pushes a body.
Question 4
1 / -0

How much force acts on body whose momentum is constant (i.e. = constant)?

A
Zero

B
None

C
p/2t

D
2p/t

Solution

Explanation:

Force is the rate of change of momentum. So, momentum is constant when force is zero.
Question 5
1 / -0

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
both the statement a and b

C
statement B

D
statement A

Solution

Explanation:

Gravitational force is very weak force as it depends upon mass of the body and distance between two objects. Electrostatic force is non-contact force.
Question 6
1 / -0

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
Velocity is proportional to the force exerted on the ball.

C
There is a force on the ball opposing the motion

D
There is no unbalanced force on the ball so the ball would want to come to rest.

Solution

Explanation:

The ball moving on level ground comes to rest after covering a short distance due to frictional force acting on it. So, ball slows to a stop because there is a force on the ball opposing the motion.
Question 7
1 / -0

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

D
1-A, 2-C, 3-B, 4-D
Question 8
1 / -0

How much force acts on body whose momentum is constant (i.e. = constant)?

A
None

B
p/2t

C
Zero

D
2p/t

Solution

Explanation:

Force is the rate of change of momentum. So, momentum is constant when force is zero.
Question 9
1 / -0

10⁵ dyne is equal to

A
1.5N

B
2.5N

C
1N

D
2N

Solution

Explanation:

One Newton (1N) is equal to 105 dyne. Both dyne and Newton is unit of force.
Question 10
1 / -0

A force has

A
direction only

B
both a and b

C
magnitude only

D
none of these

Solution

Explanation:

A force has both magnitude as well as direction. Force is a vector quantity. Force is the product of mass and acceleration.

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Forces and Laws of Motion Test - 1

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Forces and Laws of Motion Test - 1

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Question 1

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

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

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

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

Question 2

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

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

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

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

Question 3

The spring force always pushes a body.

Frictional force always acts parallel to the surface of contact.

The tension of a string always pulls a body.

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

Solution

Question 4

Zero

None

p/2t

2p/t

Solution

Question 5

neither statement A nor B

both the statement a and b

statement B

statement A

Solution

Question 6

Ayush did not hit the ball hard enough

Velocity is proportional to the force exerted on the ball.

There is a force on the ball opposing the motion

There is no unbalanced force on the ball so the ball would want to come to rest.

Solution

Question 7

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

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

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

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

Question 8

None

p/2t

Zero

2p/t

Solution

Question 9

1.5N

2.5N

1N

2N

Solution

Question 10

direction only

both a and b

magnitude only

none of these

Solution

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