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9th Class Physics Chapter 3 Dynamics English Medium KPK Boards Online Mcqs MCQs With Answers

Question # 1

When a horse pulls a cart , the action is on the :

Choose an answer

Cart

Earth

Man

Earth & cart

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Question # 2

In which case it is easy for the tyre to roll over:

Choose an answer

Rough ground

Smooth ground

Same

None

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Question # 3

Rocket works on principle of ______________

Choose an answer

Action Reaction

Law of inertia

Mass energy

Nil

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Question # 4

The unit of coefficient of friction .

Choose an answer

Newton

ms^-1

ms^-2

No unit

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Question # 5

The Atwood machine can be used to find the acceleration due to gravity using the equation

Choose an answer

g = 2 (m1 x m2)/(m1 + m2) a

g = (m1 - m2)/(m1 + m2) a

g = (m1 + m2)/(m1 - m2) a

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Question # 6

Which of the following is unit of momentum?

Choose an answer

Kgms^-2

Ns^-1

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Question # 7

To every action there is always an equal but __________ reaction:

Choose an answer

Same

Parallel

Opposite

Equal

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Question # 8

How much force is needed to body of mass 10 kg from falling:

Choose an answer

100 N

150 N

200 N

300 N

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Question # 9

1 Newton =_________

Choose an answer

1 kg ms^-2

1 kg ms

1 kg m^-1s^-2

1 kg^-1m^-1 s^-1

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Question # 10

The acceleration produced in a moving body is always in the direction of applied

Choose an answer

Velocity

Force

Speed

Momentum

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Question # 11

Friction is due to

Choose an answer

Roughness

Shape

Smoothness

None

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Question # 12

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:

Choose an answer

m1 x m₂ / m₁ + m₂ g

m₁ - m₂ / m₁ + m₂ g

m₁ + m₂ / m₁ - m₃ g

None of these

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Question # 13

2nd law of motion is stated as:

Choose an answer

F=m/a

F=ma

F=a/m

F=ma²

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