Chapter-2 Motion — Online MCQ Test
SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board
Practice Chapter-2 Motion with a free chapter-wise online MCQ test.
This chapter covers: Description Covers distance displacement speed velocity acceleration and equations of motion Keywords Distance Displacement Speed Velocity Acceleration.
AI-generated questions from basic to board-exam level, with instant results and explanations.
Chapter-2 Motion — Important Questions & Answers
What is the SI unit of speed?
- A. metre per second
- B. metre
- C. second
- D. kilogram
Answer: A. metre per second
Speed is distance covered per unit time. Its SI unit is metre per second (m/s).
Speed is distance covered per unit time. Its SI unit is metre per second (m/s).
Which of the following is a scalar quantity?
- A. Velocity
- B. Displacement
- C. Speed
- D. Acceleration
Answer: C. Speed
Speed has magnitude only and no direction, so it is a scalar quantity.
Speed has magnitude only and no direction, so it is a scalar quantity.
A car travels 120 km in 3 hours. What is its average speed?
- A. 30 km/h
- B. 40 km/h
- C. 60 km/h
- D. 90 km/h
Answer: B. 40 km/h
Average speed = total distance / total time = 120 / 3 = 40 km/h.
Average speed = total distance / total time = 120 / 3 = 40 km/h.
A train covers equal distances in equal intervals of time. Which statement is correct?
- A. The train has uniform speed
- B. The train is at rest
- C. The train has zero displacement
- D. The train has changing acceleration always
Answer: A. The train has uniform speed
Equal distances covered in equal intervals of time indicate uniform speed. This is the definition of uniform motion.
Equal distances covered in equal intervals of time indicate uniform speed. This is the definition of uniform motion.
A car moving at 20 m/s is brought to rest in 4 s with uniform retardation. What is its acceleration?
- A. 5 m/s²
- B. -5 m/s²
- C. 4 m/s²
- D. -4 m/s²
Answer: B. -5 m/s²
Acceleration = (v - u) / t = (0 - 20) / 4 = -5 m/s². The negative sign shows retardation.
Acceleration = (v - u) / t = (0 - 20) / 4 = -5 m/s². The negative sign shows retardation.