What Is the circuit limit and contract in sharemarket?

Acconrding to the stock of the week was Akruti City, which jumped 37% despite Friday’s 27% and thursday 15% fall. The NSE will exclude (why ?)the stock from F&O list. Its April and May contracts will close on March 26, 2009. The stock will be available for trading with a 5% circuit.(whats this) can someone expect the above scripe price will fall tomorrow are comming days despite of sensex up (if i hoping)