MCQ practice · SSC Physics Board questions · Chapter 3: Force
Action and reaction forces:
Think it through first, then pick an option.
- a are unequal to each other
- b act for the same length of time
- c are applied on the same body
- d have the same direction
Answer and explanation
Correct answer: b act for the same length of time
Each lasts exactly as long as the other: they appear together and act for the same time.
Why the other options are wrong
- a are unequal to each other: Action and reaction are equal in magnitude; one is never bigger than the other.
- c are applied on the same body: The two forces act on different bodies, never on the same body.
- d have the same direction: The two forces point in opposite directions, not the same direction.
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