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I. The motion of the tyres of a moving car.
II. Th...

I. The motion of the tyres of a moving car.
II. The motion of a loaded test tube oscillated
vertically.
III. The beating of the heart.
IV. A stone tied to a string and whirled round.
V. The motion of the pistons in a gasoline engine.
Which of the motions above is simple harmonic?

A.

III, IV and V only

B.

II, III and V only

C.

II, III and IV only

D.

I,II and III only

Correct answer is B

Simple harmonic motion is the motion of a body whose acceleration is directed towards a fixed point and is directly proportional to its displacement from point.

Statements ii, iii and v are clear examples