if yes Means how can i sell???
any conversion Reqire???
No, you cannot sell them on an intraday basis. However, you can sell if you have it in your DEMAT (assuming the company is listed in both NSE and BSE).
No you cannot
Exchange where you bought them is irrelevant if the stock is in your demat account. There will be no identity or trail of the exchange from which you bought the stock. I am unsure about intraday.