why does currency rates differ from country to country.tell me abt sensex and nifty.how does gold prices rise.

Answer 1

It is a long discussion about why it differs there are many sites have study material on this. Try wikipedia on this topic.

Answer 2

currency rate indicates the position of that country.

sensex depends on 30 companies and nifty 50 companies. If overall the share values of these companies raises so sensex or nifty raises

gold prices depends on
1) crude oil rates - directly proportional
2) supply and demand