MCQ practice · SSC Physics Board questions · Chapter 2: Motion
What kind of motion are the contraction and expansion of the heart?
Think it through first, then pick an option.
- a Oscillatory motion
- b Translational motion
- c Rotational motion
- d Periodic motion
Answer and explanation
Correct answer: d Periodic motion
The book's example: the heart's beat repeats in the same direction and the same way after a fixed interval, so it is periodic motion.
Why the other options are wrong
- a Oscillatory motion: The book calls the heart's motion periodic: it repeats in the same direction and the same way after a fixed interval. Oscillatory motion is a special kind of periodic motion, and the book's name for the heart is periodic.
- b Translational motion: In translational motion all particles of the body move the same distance in the same direction. The heart does not travel anywhere; it keeps contracting and expanding. The right name is periodic motion.
- c Rotational motion: In rotational (circular) motion a body turns around a point or an axis. The heart does not turn. Its motion returns after a fixed interval, so it is periodic.
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