The pendulum used in a clock is:

1. Simple pendulum
2. Compound pendulum
3. Second pendulum
4. None of these

The effective length of a pendulum is related with time period as :

1. T² ∝ l²
2. T³ ∝ l
3. T² ∝ l
4. T ∝ L³

The time period of a seconds' pendulum clock is —

1. 1 s
2. 2 s
3. 1 min
4. 12 h

Time period of a simple pendulum is given by :

1. $T = 2 π \sqrt{\dfrac{g}{l}}$
2. $T = 2 π \sqrt{\dfrac{l}{g}}$
3. $T = 4 π \sqrt{\dfrac{l}{g}}$
4. $T = 4 π \sqrt{\dfrac{g}{l}}$