The main scale division of a vernier calliper is 1 mm and its vernier has 10 divisions. Find its least count.

Why is the simple pendulum used to measure time, and what is meant by an oscillation?

A pendulum of length 1 m has a time period of 2 s. What length would give a time period of 1 s?

What is meant by the least count of an instrument? State the least count of vernier callipers and of a screw gauge.

The length of a seconds pendulum is about 100 cm. What is its time period, and what does the name mean?

State the factors on which the time period of a simple pendulum depends and those on which it does not.

Convert 72 km h⁻¹ into m s⁻¹.