Please answer any 1 one of it

 (2) Dear student,

Such questions are made for enhancing the self-creative skills and should be tried answering on your own. However, here are a few points that will help you in framing your answer:

1. Introduction of History of timekeeping devices.
2. Continuous timekeeping devices.
3. History of early oscillating devices in timekeepers.
4. Era of precision timekeeping.
5. Atomic clocks etc.

You may feel free to contact us if you face any issue or difficulty while composing your answer. You can also send us your answers here for feedback and required corrections, if any.