Chapter Exam

Chapter 8 PHYSICAL SCIENCE : Force and Laws of Motion — Online MCQ Test

Q: What is the SI unit of force?

Answer: A. Newton — The SI unit of force is Newton (N), named after Isaac Newton.

Q: Which law of motion is also known as the Law of Inertia?

Answer: A. Newton's First Law — Newton's first law defines inertia, stating an object remains in its state of rest or motion unless acted upon by an external force.

Q: When a force of 5N acts on a mass of 10kg, the acceleration produced is:

Answer: A. 0.5 m/s² — Using F=ma, acceleration a = F/m = 5/10 = 0.5 m/s².

Q: Action and reaction forces:

Answer: B. Act on different bodies in opposite directions — Newton's third law states action and reaction are equal, opposite, and act on different bodies.

Q: Two objects of masses 100g and 200g are moving along the same line and direction with velocities 2 m/s and 1 m/s respectively. They collide and stick together. What is the velocity of the combined mass?

Answer: A. 1.33 m/s — Total initial momentum = (0.1 * 2) + (0.2 * 1) = 0.4. Total mass = 0.3kg. Final velocity = 0.4 / 0.3 = 1.33 m/s.

SCIENCE · CLASS 9th · Andhra State Board

Practice Chapter 8 PHYSICAL SCIENCE : Force and Laws of Motion with a free chapter-wise online MCQ test for Andhra State Board CLASS 9th SCIENCE. This chapter covers: This chapter details balanced unbalanced forces Newton three laws of motion inertia mass momentum and conservation of momentum principles.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 8 PHYSICAL SCIENCE : Force and Laws of Motion — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 9th SCIENCE — Chapter 8 PHYSICAL SCIENCE : Force and Laws of Motion, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the SI unit of force?

A. Newton ✓
B. Joule
C. Pascal
D. Watt

Answer: A. Newton
The SI unit of force is Newton (N), named after Isaac Newton.

Which law of motion is also known as the Law of Inertia?

A. Newton's First Law ✓
B. Newton's Second Law
C. Newton's Third Law
D. Law of Gravitation

Answer: A. Newton's First Law
Newton's first law defines inertia, stating an object remains in its state of rest or motion unless acted upon by an external force.

When a force of 5N acts on a mass of 10kg, the acceleration produced is:

A. 0.5 m/s² ✓
B. 2 m/s²
C. 50 m/s²
D. 5 m/s²

Answer: A. 0.5 m/s²
Using F=ma, acceleration a = F/m = 5/10 = 0.5 m/s².

Action and reaction forces:

A. Act on the same body
B. Act on different bodies in opposite directions ✓
C. Always have different magnitudes
D. Have a net force of non-zero value

Answer: B. Act on different bodies in opposite directions
Newton's third law states action and reaction are equal, opposite, and act on different bodies.

Two objects of masses 100g and 200g are moving along the same line and direction with velocities 2 m/s and 1 m/s respectively. They collide and stick together. What is the velocity of the combined mass?