Chapter 4: Describing Motion Around Us — Online MCQ Test
SCIENCE · Grade 9 · CBSE(NCERT)
Practice Chapter 4: Describing Motion Around Us with a free chapter-wise online MCQ test.
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....
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Chapter 4: Describing Motion Around Us — Important Questions & Answers
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.
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.
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.
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.
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.
The motion forms a right triangle, so displacement = √(6² + 8²) = √100 = 10 m.