The bob of a simple pendulum is made of wood and bob of another pendulum, identical in size, is made of iron. Which of them will have a smaller time period?

Explanation

Both of them will have same time period as time period does not depend on the nature of material of the bob. In other words, the position of centre of mass remains same for both the pendulums and therefore, the length of the pendulum remains same. So, the time period is same for both the bobs.