Forces and Laws of Motion Test

Result

Forces and Laws of Motion Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?

A
Its speed keeps changing

B
Its velocity always changes

C
It always goes away from the earth

D
A force is always acting on it

Solution

An object moving along a straight path in an accelerated motion does not always go away from the earth.
Question 2
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According to the third law of motion, action and reaction

A
Always act on the same body

B
Always act on different bodies in opposite directions

C
Have same magnitude and directions

D
Act on either body at normal to each other

Solution

Action and reaction act on different bodies but in opposite directions. They have the same magnitude.
Question 3
1 / -0

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to

A
Exert larger force on the ball

B
Reduce the force exerted by the ball on hands

C
Increase the rate of change of momentum

D
Decrease the rate of change of momentum

Solution

Pulling the hand backward allows enough time to reduce the momentum of the ball. This helps in reducing the force exerted by the ball on hands.
Question 4
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The inertia of an object tends to cause the object

A
To increase its speed

B
To decrease its speed

C
To resist any change in its state of motion

D
To decelerate due to friction

Solution

The inertia of an object tends to cause the object to resist any change in its state of motion.
Question 5
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A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is

A
Accelerated

B
Uniform

C
Retarded

D
Along circular tracks

Solution

As the coin tossed falls behind the passenger, so it means that motion of the train is accelerated.
Question 6
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An object of mass 2 kg is sliding with a constant velocity of \(4 \,m s^{–1}\) on a frictionless horizontal table. The force required to keep the object moving with the same velocity is

A
32 N

B
0 N

C
2 N

D
8 N

Solution

According to Newton’s first law of motion, an object continues to be in a state of rest or of uniform motion unless acted upon by an unbalanced force. So, there is no requirement of applying force on the object to keep it moving with constant velocity.
Question 7
1 / -0

Rocket works on the principle of conservation of

A
Mass

B
Energy

C
Momentum

D
Velocity

Solution

The high velocity of hot gasses which is coming out from the rocket is balanced by the up move of the rocket.This gas has large momentum and an equal momentum is acted to the rocket in opposite direction due to which rocket moves upward.Their conservation of momentum is working.
Question 8
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A water tanker filled up to \(2\over\ 3\) of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

A
Move backward

B
Move forward

C
Be unaffected

D
Rise upwards

Solution

Due to inertia of motion, the water in the tank would move forward on sudden application of the brake.
Question 9
1 / -0

A passenger in a moving train tosses a coin. The coin will fall back

A
Behind him

B
In front of him

C
On his hands

D
On the side of the train

Solution

A passenger in a moving train tosses a coin. The coin will fall back on his hands.
Question 10
1 / -0

Qualitative definition of Force is given by

A
Newton’s law of gravitation

B
Newton’s first law of motion

C
Newton’s Second law of motion

D
Newton’s third law of motion

Solution

Qualitative definition of Force is given by Newton’s first law of motion.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 14

Result

Forces and Laws of Motion Test - 14

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SHARING IS CARING

Question 1

Its speed keeps changing

Its velocity always changes

It always goes away from the earth

A force is always acting on it

Solution

Question 2

Always act on the same body

Always act on different bodies in opposite directions

Have same magnitude and directions

Act on either body at normal to each other

Solution

Question 3

Exert larger force on the ball

Reduce the force exerted by the ball on hands

Increase the rate of change of momentum

Decrease the rate of change of momentum

Solution

Question 4

To increase its speed

To decrease its speed

To resist any change in its state of motion

To decelerate due to friction

Solution

Question 5

Accelerated

Uniform

Retarded

Along circular tracks

Solution

Question 6

32 N

0 N

2 N

8 N

Solution

Question 7

Mass

Energy

Momentum

Velocity

Solution

Question 8

Move backward

Move forward

Be unaffected

Rise upwards

Solution

Question 9

Behind him

In front of him

On his hands

On the side of the train

Solution

Question 10

Newton’s law of gravitation

Newton’s first law of motion

Newton’s Second law of motion

Newton’s third law of motion

Solution

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