The time period of a simple pendulum depends on :

1. Length of pendulum
2. Amplitude of oscillation
3. Mass of bob
4. All of the above

Length of pendulum

Reason — The time period of oscillation is directly proportional to the square root of its effective length i.e., T ∝ $\sqrt{l}$ or in other words, the square of time period of oscillation (T²) is directly proportional to its effective length (l) i.e., T² ∝ l. Hence, we can say that, time period of a simple pendulum depends on length of pendulum.