Does different stock options have different margin?

Does different stock options have different margin? If so, how to find the stock options which requires less margin to short?

Yes, they do. The margins depend on the volatility of individual stocks. Also, it may not be a great idea to short a stock just because it has the least margin required!

Yes, for every stocks required different-2 margin.

Yes, they do.If so, how to find the stock investment options which requires less margin to short?it has the least margin required!

How to check the volatility of individual stocks or a list with volatility of all available stocks?

Check this - http://tradingqna.com/9626/implied-volatility-stocks-exactly-follow-trend-curve-nifty?show=9626#q9626