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Class 9 Physics — Online Test

Chapter 3: Dynamics

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📋 Instructions: Select one answer for each question, then click Submit Test at the bottom to see your score and correct answers.

Q1 Newton's first law of motion is also called:

Law of acceleration Law of inertia Law of action-reaction Law of gravitation

Q2 The SI unit of force is:

Joule Watt Newton Pascal

Q3 Which of the following has the greatest inertia?

A bicycle A car A truck A motorcycle

Q4 F = ma is the mathematical form of Newton's:

First law Second law Third law Law of gravitation

Q5 When a bullet is fired from a gun, the gun recoils. This is Newton's:

First law Second law Third law Law of inertia

Q6 The momentum of a body is defined as:

mass × acceleration mass × velocity force × time force × distance

Q7 The SI unit of momentum is:

N/s kg·m/s kg·m/s² N·m

Q8 Friction force always acts:

In the direction of motion Perpendicular to motion Opposite to motion At 45° to motion

Q9 Which of the following reduces friction?

Rough surfaces Lubrication Increased weight Grooved tyres

Q10 Total momentum of an isolated system is:

Always increasing Always decreasing Always constant Always zero

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