Question

Why the error creeps into the time shown by the pendulum clock made of ordinary metal during winter and summer.

• A. In summer days are long and in winter it is small
• B. In summer, the length of the pendulum decreases, and in winter, it increases.
• C. In summer, the length of the pendulum increases, and in winter, it decreases.
• D. In summer days are small and in winters it is long

Answer 1

Answer: (C)

In summer, the length of the pendulum increases, and in winter, it decreases.

The time taken for the pendulum to complete one oscillation is called period $\left(T\right)$. $T$ increases with increase in length. We know that substances expand on heating and contract on cooling.