Lesson 7 – Momentum & Collisions

Stage 2: Board Exam Questions & Answers
Page 5 – Assertion–Reason, Match & Very Short Answers

This page completes the Stage 2 (Board Exam) preparation by covering Assertion–Reason, Match the Following, and Very Short Answer questions.

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1️⃣ Assertion–Reason Questions

Q1.

Assertion (A): Momentum is conserved in all types of collisions.

Reason (R): External forces are absent during collision.

Answer:
Both A and R are true and R is the correct explanation of A.

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Q2.

Assertion (A): Kinetic energy is conserved in elastic collisions.

Reason (R): The coefficient of restitution is equal to 1.

Answer:
Both A and R are true and R is the correct explanation of A.

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2️⃣ Match the Following

Column A	Column B
Elastic collision	Kinetic energy conserved
Perfectly inelastic collision	Bodies stick together
Recoil	Backward motion of gun
Relative velocity	Difference of velocities

Correct Matching:
Elastic collision → Kinetic energy conserved
Perfectly inelastic → Bodies stick together
Recoil → Backward motion of gun
Relative velocity → Difference of velocities

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3️⃣ Very Short Answer Questions (1 Mark)

Q1. Write the formula for momentum.

p = mv

Q2. What is the value of e for elastic collision?

e = 1

Q3. Is momentum a scalar or vector?

Vector quantity

Q4. What happens to KE in a perfectly inelastic collision?

Maximum loss of KE

Q5. Which law explains recoil?

Conservation of momentum

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✔ Stage 2 (Board Exam Q&A) is now complete
✔ Covers all question patterns asked in Intermediate exams

👉 Next: Phase 1 – IIT/JEE Solved Problems (Basic → Moderate)