Question

Which of the following motions are periodic as well as oscillatory?

• A. Only 1 and 2
• B. Only 2 and 3
• C. Only 3 and 4
• D. Only 1 and 4

Answer 1

The correct option is B

Only 2 and 3

An oscillatory motion is to and fro motion which repeats itself after regular intervals of time. All oscillatory motions are periodic. Motion of the pendulum of a wall clock and motion of a child on a swing are both periodic as well as oscillatory. However, the motion of the Earth around the Sun and that of the blades of a ceiling fan are periodic but not oscillatory as the motion is not to and fro.