Question # 1

Sliding friction can be changed into rolling friction by using:

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Ball bearing

Roller bearing

Both a and b

None of these

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

If the mass of body is doubled while keeping the force contant, then acceleration will be:

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Doubled

One half

4 times

One fourth

Rocket works on principle of ______________

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Action Reaction

Law of inertia

Mass energy

Nil

Two bodies of masses m₁ and m₁ attached to the ends of an inextensible string passing over a frictionless pulley such that both move vertically. The acceleration of the bodies is:

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m1 x m₂ / m₁ + m₂ g

m₁ - m₂ / m₁ + m₂ g

m₁ + m₂ / m₁ - m₃ g

None of these

A body jumps out of a moving bus. There is a danger for him to fall:

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Towards the moving bus

Away form the bus

In the direction of motion

opposite to the direction of motion

Action and Reaction are always on:

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Same body

Different bodies

Any body

None of these

All divers need to wear seat belt because of effect of:

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Air resistance

Tensional

Push force

Gravitational

The formula of momentum is:

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P=Fa

P=mv

F=ma

F=mg

Which of the following is unit of momentum?

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Nm

Kgms^-2

Ns

Ns^-1

The unit of π is:

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N

m

s

None

Centripetal force always acts _________ to the motion:

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Opposite

Parallel

Perpendicular

Upward

Which of the following material lowers friction when pushed between metal plates:

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Water

Fine marble poder

Air

Oil

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

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