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MCQ practice · SSC Physics Board questions · Chapter 3: Force

Jashore Board 2023

When a bullet is fired from a gun:

  1. i. the recoil velocity of the gun will be less than that of the bullet
  2. ii. the gun will push forward
  3. iii. the momentum of the bullet and of the gun will be equal and opposite

Think it through first, then pick an option.

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

Correct answer: c i and iii

The gun is heavier, so with equal and opposite momentum its recoil velocity is smaller (i true); the two momenta are equal and opposite (iii true); the gun kicks backward, not forward (ii false).

Why the other options are wrong

  • a i and ii: ii is false: the gun kicks backward, not forward; and iii is true, so this option leaves it out.
  • b ii and iii: ii is false: the gun is pushed opposite to the bullet, backward; so ii and iii cannot both hold.
  • d i, ii and iii: ii is false: the gun kicks backward, so all three cannot be true.