Chapter 4: Motion – Important MCQs
1. A body is said to be in motion if it:
A. Changes its mass
B. Changes its shape
C. Changes its position with time
D. Remains at rest
✔️ Answer: C. Changes its position with time
2. The SI unit of speed is:
A. km/h
B. m/s
C. cm/s
D. m/min
✔️ Answer: B. m/s
3. Which of the following is a vector quantity?
A. Distance
B. Speed
C. Displacement
D. Temperature
✔️ Answer: C. Displacement
4. A car travels 60 km in 2 hours. Its average speed is:
A. 30 km/h
B. 60 km/h
C. 120 km/h
D. 15 km/h
✔️ Answer: A. 30 km/h
5. If an object moves in a circular path with constant speed, its motion is called:
A. Non-uniform motion
B. Uniform motion
C. Accelerated motion
D. Uniform circular motion
✔️ Answer: D. Uniform circular motion
6. The slope of a distance-time graph gives:
A. Acceleration
B. Velocity
C. Force
D. Distance
✔️ Answer: B. Velocity
7. The acceleration of a body is defined as:
A. Rate of change of displacement
B. Rate of change of speed
C. Rate of change of velocity
D. Rate of change of direction
✔️ Answer: C. Rate of change of velocity
8. The SI unit of acceleration is:
A. m/s
B. m/s²
C. km/h²
D. cm/s²
✔️ Answer: B. m/s²
9. An object moves with a constant velocity. Its acceleration is:
A. Maximum
B. Zero
C. Infinite
D. Cannot be determined
✔️ Answer: B. Zero
10. A train starts from rest and attains a velocity of 72 km/h in 5 seconds. Its acceleration is:
A. 20 m/s²
B. 2 m/s²
C. 4 m/s²
D. 10 m/s²
✔️ Answer: B. 4 m/s²
(Note: 72 km/h = 20 m/s; a = (v – u)/t = (20 – 0)/5 = 4 m/s²)
