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Physics 9th Class English Medium Unit 3 Online Test MCQs With Answers

Question # 1

The formula for centripetal force is:

Choose an answer

Fc = mv2

Fc = mr2

Fc = mv2 / r

Fc = m/v

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Question # 2

A sugar bag of 1 kg has a momentum 25 kg m/s than its velocity is :

Choose an answer

v = 20 m/s

v = 25 kg

V = 25 m/s

v = 25 kg/ms-1

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Question # 3

Which law of motion is called law of inertia:

Choose an answer

first law of motion

Second law of motion

Third law of motion

Law of conversation of momentum

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Question # 4

Newton related inertia of the body with its

Choose an answer

Weight

Mass

Density

Force

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Question # 5

The velocity and acceleration of the body moving with uniform speed in a circular path will be:

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In same direction

In opposite direction

Mutually perpendicular

Equal

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Question # 6

Centripetal force always acts _________ to the motion:

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Opposite

Parallel

Perpendicular

Upward

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Question # 7

Outer edge of the curved road is elevated to prevent

Choose an answer

Circular motion

Centripetal force

Skidding

Protection

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Question # 8

Friction is due to

Choose an answer

Roughness

Shape

Smoothness

None

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Question # 9

________ is used to measure the force or weight of a body :

Choose an answer

Physical balance

Spring balance

A and B both

None

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Question # 10

The formula to determine the centripetal force is:

Choose an answer

mv²/r

Ns^-1

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Question # 11

in isolated system the momentum after collision of two bodies.

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Increase

Constnat

Decrease

Zero

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Question # 12

A body of mass 5 kg i moving with a velocity of 10 ms^-1. Find the force required to stop it in 2s.

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5 N

25 N

20 N

30 N

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Question # 13

Sliding friction can be changed into rolling friction by using:

Choose an answer

Ball bearing

Roller bearing

Both a and b

None of these

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