User:Ramphy

This is a group for discussions on Physics.

1. What do you understand by measurements? Explain. 2. Why do we need to follow uniform system of measurement? 3. What are the units of Length, Mass and Time in different system of units? 4. What is a unit? 5. What is the SI unit of length? How do you use it ( with reference to prefixing) to measure(a)distance between two cities, (b) thickness of a paper sheet and (c) the dimension of amoeba? 6. How many metres make a (a) milli metre (b) micro metre and (c) kilo metre? 7. How many kgs make a (a) tonne (b) mega tonne and (c) gram 8. How many seconds make a (a) minute and (b) hour? 9. What is a light year? Is it a unit of distance or time? How long is one light year? 10. How long does earth take for (a) one rotation and (b) one revolution? 11. Each country/ nation maintains a standard clock to keep record of time. What is the name for this clock? It is very precise and accurate. It deviates only by one millionth of a second for one year. All other clocks like the one which we see in television just before broadcasting daily news and the one shown by all cell phones. 12. How many days a leap year has? Which month of the leap year has more days? Why do we have leap years?