Chapter Exam

Chapter 7: Motion — Online MCQ Test

Q: Which of the following is a scalar quantity?

Answer: C. Distance — Distance has only magnitude and no direction, so it is a scalar quantity. Displacement, velocity, and acceleration are vector quantities.

Q: The SI unit of acceleration is:

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

Q: A student walks 3 m east and then 3 m west. What is the displacement?

Answer: C. 0 m — The student returns to the starting point, so the final position is the same as the initial position. Therefore, displacement is zero.

Q: Which of the following is the best reason why uniform circular motion is considered accelerated motion?

Answer: B. Its direction changes continuously — In uniform circular motion, speed may remain constant, but velocity changes because the direction changes at every instant. Change in velocity means acceleration.

SCIENCE · CLASS 9th · Karnataka State Board

Practice Chapter 7: Motion with a free chapter-wise online MCQ test for Karnataka State Board CLASS 9th SCIENCE. This chapter covers: This chapter covers distance displacement velocity acceleration uniform non-uniform motion equations of motion and uniform circular motion.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Motion — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 9th SCIENCE — Chapter 7: Motion, 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. Displacement
B. Velocity
C. Distance ✓
D. Acceleration

Answer: C. Distance
Distance has only magnitude and no direction, so it is a scalar quantity. Displacement, velocity, and acceleration are vector quantities.

The SI unit of acceleration is:

A. m/s
B. m/s² ✓
C. km/h
D. kg/m³

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

A student walks 3 m east and then 3 m west. What is the displacement?

A. 6 m
B. 3 m
C. 0 m ✓
D. 1.5 m

Answer: C. 0 m
The student returns to the starting point, so the final position is the same as the initial position. Therefore, displacement is zero.

Which statement best distinguishes speed from velocity?

A. Speed is always negative; velocity is always positive
B. Speed has direction; velocity does not
C. Speed is a scalar quantity; velocity is a vector quantity ✓
D. Speed and velocity are exactly the same

Answer: C. Speed is a scalar quantity; velocity is a vector quantity
Speed depends only on magnitude, while velocity includes both magnitude and direction. Therefore, speed is scalar and velocity is vector.

Which of the following is the best reason why uniform circular motion is considered accelerated motion?

A. Its speed is always increasing
B. Its direction changes continuously ✓
C. It always moves in a straight line
D. Its distance from the centre changes continuously

Answer: B. Its direction changes continuously
In uniform circular motion, speed may remain constant, but velocity changes because the direction changes at every instant. Change in velocity means acceleration.