Forces and Laws of Motion Test

Result

Forces and Laws of Motion Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following effects cannot be produced by a force?

A
Changing the mass of an object

B
Changing the shape of an object

C
Changing the position of an object

D
Changing the direction of movement of an object

Solution

The force has different effects on an object. It can change the direction of motion. For example, a batsman hits a moving ball.
A force can change the shape of the object. For example, squeezing a metal can.
It can change the position of an object. For example, kicking a football.
But force cannot change the mass of an object. It cannot be an effect of a force.
Question 2
1 / -0

When a running horse suddenly stops, the rider falls _________.

A
forwards

B
backwards

C
to his right

D
to the horse's right

Solution

When horse stop suddenly rider falls due to inertia, as when the horse is in motion rider also is in motion and when horse stop suddenly there is no external force acting on the ride to stop its motion therefore rider falls forward.
Question 3
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There are two forces of equal magnitude acting on the ball. Choose the correct option which show ball has constant velocity.

A

B

C

D

E

Solution

The ball has the constant velocity if the net external force acting on the ball is zero.
$$ma =F_{ext} = 0$$
$$\therefore$$ $$ a = 0$$ $$\implies v = $$ constant
Option C shows that the net external force on the ball is zero.
Question 4
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If a body is acted upon by a constant force then it will have a uniform _________.

A
velocity

B
acceleration

C
inertia

D
momentum

Solution

According to Newton second law
$$F=Ma$$
Now if F is constant and mass is also constant
$$a=\dfrac{F}{M}$$
$$a=k(constant)$$

So uniform acceleration.
Question 5
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A lead block is suspended from your hand by a string. The reaction due to the force of gravity on the block is the force exerted by

A
the string on the block

B
the block on the string

C
the string on the hand

D
the gravitational force acting on earth due to block

Solution

So By newton third law
Earth will also experience same reaction force.
Question 6
1 / -0

Momentum is a measure of quantity of _______.

A
motion

B
friction

C
gravitation

D
electric force

Solution

Momentum is a measure of the quantity of motion possessed by an object by virtue of its mass and velocity. Massive objects have high momentum than lighter objects and fast-moving objects have high momentum than slow moving objects.
So, option $$A$$ is the correct answer.
Question 7
1 / -0

While dusting a carpet, we give it a sudden jerk or beat it with a stick because:

A
the inertia of rest keeps the dust in its position and the dust is removed when the carpet moves away.

B
the inertia of motion removes dust.

C
no inertia involved in process.

D
jerk compensates for the force of adhesion between dust and carpet and dust is removed.

Solution

While dusting we give a sudden serk our beat with stick because when we do that stick because when we do that the particle of carpet move with our help and the dust particle stays at rest by inertia and eventually they separate from the carpet.
Question 8
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If KE of a given particle is doubled, its momentum will be:

A
Doubled

B
Tripled

C
Increases by $$\sqrt{2}$$ times

D
Remains unchanged

Solution

The relation between kinetic energy $$(K)$$ and momentum $$(p)$$ is given by, $$K=\dfrac{p^2}{2m}$$ where $$m$$ be the mass of the body
So, $$p=\sqrt{2mK}$$
If kinetic energy is doubled, the momentum becomes, $$p'=\sqrt{2m(2K)}=\sqrt{2}p$$
Question 9
1 / -0

From Newton's third law, Action and reaction____.
Which of the following will not fit in the above sentence.

A
acts on the same body

B
are equal

C
are opposite in direction

D
acts on different bodies

Solution

According to newton's third law of motion, every action has an equal and opposite reaction. The action-reaction pair always acts on different bodies.
So option A is wrong and rest three options are correct.
Question 10
1 / -0

On which one of the following conservation laws, does a rocket work?

A
Mass

B
Energy

C
Linear momentum

D
Angular momentum

Solution

Rocket works on the principle of conservation of linear momentum.