Comment on Various Types of Accounts
1. Yes, you can buy and sell on the same day. It’s considered an Intraday trade.
2. You can withdraw profits on settlement, i.e on T+1 day, the day after you make the profits.
3. Depends on the product code you’re selecting. If you’re placing orders under MIS, then the positions get squared off automatically. However the onus of squaring off all intraday positions lies entirely on you.