Chapter Exam

Chapter 4: Describing Motion Around Us — Online MCQ Test

Q: Which of the following is a scalar quantity?

Answer: C. Speed — Speed has only magnitude and no direction, so it is a scalar quantity.

Q: The SI unit of acceleration is:

Answer: B. m/s² — Acceleration is the rate of change of velocity, so its SI unit is metre per second squared.

Q: A student walks 3 m east and then 4 m west. What is the total distance travelled?

Answer: B. 7 m — Distance is the total path covered, so 3 m + 4 m = 7 m.

Q: A body moves 10 m east and then 10 m west. Which of the following is true?

Answer: B. Distance = 20 m, Displacement = 0 — The body covers 20 m in total, but returns to the starting point, so displacement is zero.

Q: A person walks 6 m north and then 8 m east. The magnitude of displacement is:

Answer: B. 10 m — The motion forms a right triangle, so displacement = √(6² + 8²) = √100 = 10 m.

SCIENCE · Grade 9 · CBSE(NCERT)

Practice Chapter 4: Describing Motion Around Us with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 9 SCIENCE. This chapter covers: Motion Distance Displacement Speed Velocity Acceleration Reference Frame Scalar Vector Motion Graph Position Time Graph Velocity Time Graph Measuring and analysing motion using gra.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 4: Describing Motion Around Us — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 9 SCIENCE — Chapter 4: Describing Motion Around Us, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is a scalar quantity?

A. Velocity
B. Displacement
C. Speed ✓
D. Acceleration

Answer: C. Speed
Speed has only magnitude and no direction, so it is a scalar quantity.

The SI unit of acceleration is:

A. m/s
B. m/s² ✓
C. km/h
D. m²/s

Answer: B. m/s²
Acceleration is the rate of change of velocity, so its SI unit is metre per second squared.

A student walks 3 m east and then 4 m west. What is the total distance travelled?

A. 1 m
B. 7 m ✓
C. 4 m
D. 3 m

Answer: B. 7 m
Distance is the total path covered, so 3 m + 4 m = 7 m.

A body moves 10 m east and then 10 m west. Which of the following is true?

A. Distance = 0, Displacement = 20 m
B. Distance = 20 m, Displacement = 0 ✓
C. Distance = 10 m, Displacement = 10 m
D. Distance = 20 m, Displacement = 20 m

Answer: B. Distance = 20 m, Displacement = 0
The body covers 20 m in total, but returns to the starting point, so displacement is zero.

A person walks 6 m north and then 8 m east. The magnitude of displacement is:

A. 14 m
B. 10 m ✓
C. 2 m
D. 48 m

Answer: B. 10 m
The motion forms a right triangle, so displacement = √(6² + 8²) = √100 = 10 m.

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