questionsi n physics

1. What are the basic forces of nature? explain
2. Distinguish between fundamental/derived units.
3. SI system is superior.why?
4. what are random errors and and how can we minimise them?
5. What are the fundamental/derived units?
6. what is coherent system of units?
7. distinguish between atomic/quartz clock
8. what are significant errors?
9. what is known as rounding off?
10. Tabulate the fundamental quantities in Si system