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

Question # 1

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

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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 # 2

The formula to determine the centripetal force is:

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mv²/r

Ns^-1

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Question # 3

Mass is measured by:

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Spring balance

Measuring cylinder

Physical Balance

None of these

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Question # 4

A string is stretched by two equal and opposite forces 10 N each. The tension in the string is

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Zero

10N

20N

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Question # 5

The force_________oppose the motion of a moving object is called:

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Momentum

Friction

Power

Work

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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

Momentum is defined as the product of

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Mass and acceleration

Force and acceleration

Mass and velocity

Force and velocity

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Question # 8

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

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Question # 9

A ball of mass 1 kg moving with velocity 2 ms-1, Its momentum will be

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1 Ns

2 Ns

0.5 Ns

4 Ns

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Question # 10

Newton's first law of motion is valid only in the absence of:

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Force

Not force

Friction

Momentum

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Question # 11

The centripetal acceleration is always along.

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Normal force

Centripetal forces

Mass

Horizental forces

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Question # 12

If no external force acting on a body then such system is called.

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Ideal system

Controlled system

Isolated system

None

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Question # 13

The unit of momentum is:

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kgms^-2

kgms^-1

Ns^-1

None of these

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