Forces and Laws of Motion Test

Result

Forces and Laws of Motion Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

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

A
there is no force acting on the body

B
an unbalanced force acts on the body

C
it has uniform acceleration

D
no unbalanced force acts on it

Solution

There is no unbalanced force. There might be a number of forces acting on the body but these forces are adding up to zero.
Question 2
1 / -0

Which Newton's law of motion gives the magnitude of force?

A
First

B
Second

C
Third

D
None

Solution

Newton’s second law of motion gives the magnitude of force.

According to the law, Force = Mass × Acceleration
Question 3
1 / -0

Unit of which physical quantity is the same as that of the unit of the impulse of force?

A
Momentum

B
Force

C
Acceleration

D
Velocity

Solution

Both momentum and impulse of force have the same unit, i.e., kg m/s.
Question 4
1 / -0

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

A
Friction between tyres and road increases.

B
Friction between tyres and road decreases.

C
Friction between tyres and road remain same.

D
All the above.

Solution

A scooter generally slips on an oily road because oil reduces the friction between the tyres and road.
Question 5
1 / -0

It is due to which of the following reason that a rotating fan continues to rotate even after it is turned OFF?

A
Newton's first law

B
Newton's second law

C
Conservation of momentum

D
Conservation of names

Solution

The fan has a tendency to continue its circular motion even after it is switched off due to the inertia of motion. Thus, in accordance with the Newton's first law of motion, the fan continues to move for some time even after it is switched OFF.
Question 6
1 / -0

The rate of change in momentum is

A
acceleration

B
force

C
energy

D
impulse

Solution

The rate of change of momentum is equal to force.
Question 7
1 / -0

The S.I. unit of force is

A
Newton per second

B
Newton per square metre

C
Newton

D
Newton-metre

Solution

Force = Mass × Acceleration

1 Newton = 1 kg x 1 m/s²
Question 8
1 / -0

What is the momentum of a body of mass 2 m and velocity v/2?

A
mv

B
2mv

C
mv/2

D
mv/4

Solution

Momentum = mass × velocity

= 2m × v/2

→ Momentum = mv

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 4

Result

Forces and Laws of Motion Test - 4

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SHARING IS CARING

Question 1

there is no force acting on the body

an unbalanced force acts on the body

it has uniform acceleration

no unbalanced force acts on it

Solution

Question 2

First

Second

Third

None

Solution

Question 3

Momentum

Force

Acceleration

Velocity

Solution

Question 4

Friction between tyres and road increases.

Friction between tyres and road decreases.

Friction between tyres and road remain same.

All the above.

Solution

Question 5

Newton's first law

Newton's second law

Conservation of momentum

Conservation of names

Solution

Question 6

acceleration

force

energy

impulse

Solution

Question 7

Newton per second

Newton per square metre

Newton

Newton-metre

Solution

Question 8

mv

2mv

mv/2

mv/4

Solution

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