What is the SI unit of time period?

Correct option is C

The correct answer is (c) Second (s).
· The time period refers to the time taken for one complete cycle of oscillation or motion.
· The SI unit of the time period is the second (s), as time is measured in seconds in the International System of Units (SI).
Other options explained:
· Hertz (Hz): Hertz is the unit of frequency, not the time period. Frequency is the number of cycles per second.
· Metre (m): Metre is the SI unit for measuring length or distance, not time.
· Kilogram (Kg): Kilogram is the SI unit for measuring mass, not time.