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MCQ practice · SSC Physics Board questions · Chapter 2: Motion

Mymensingh Board 2023

The acceleration changes when-

  1. i. its magnitude changes
  2. ii. its direction changes
  3. iii. both its magnitude and its direction change

Think it through first, then pick an option.

  1. a i and ii
  2. b i and iii
  3. c ii and iii
  4. d i, ii and iii
Answer and explanation

Correct answer: d i, ii and iii

Acceleration is a vector, so it has both magnitude and direction. If either one or both change, the acceleration changes.

Why the other options are wrong

  • a i and ii: Statement iii is also true: acceleration changes when magnitude and direction both change. Taking only i and ii leaves out a true statement.
  • b i and iii: Statement ii is also true: acceleration changes if only its direction changes, since acceleration is a vector. Here ii is left out.
  • c ii and iii: Statement i is also true: acceleration changes if only its magnitude changes. Here i is left out.