MUMBAI, SEPT 29: Stocks surged ahead on the Bombay Stock Exchange (BSE) today pushing Sensex past 4800 mark during the mid-session following hectic buying support prompted by enthusiasm that the Centre would have a stable government after the general elections. However, several scrips declined partially at the end on profit-taking.Sensex (BSE sensitive index) opened strong at 4779.56 and advanced further to the day's high of 4831.78. However, Sensex closed below the resistance level at 4797.41 with a net gain of 63.99 points compared to the previous level of 4733.42. The BSE-100 index also rose by 27.73 points to 2240.12 from previous close of 2212.39.Brokers said bulls stepped up buying following an exit poll telecast last night that placed BJP and its allies close to a majority in the Lok Sabha elections giving them 249 out of the 418 seats in the first four phases, a clear indication of political stability.Reliance attracted brisk activity following sustained buying by FIIs. FIIs reportedlypurchased other counters like Rhone Poulenc, Cipla, Dr Reddy, E Merck, German Remedies and Glaxo. Polaris Software which issued shares at a premium of Rs 200, was listed on the BSE. The share opened at Rs 560 and closed at the day's high of Rs 775.Reliance remained the most active scrip with a turnover of Rs 381.18 crore of the total volume of business of Rs 2723.05 crore. Reliance spurted further by Rs 13.55 to Rs 241.05 on speculative support. Ranbaxy gained Rs 22.25 at Rs 1092, Zee Telefilm Rs 50 at Rs 4825, Silverline Rs 16.15 at Rs 373.55, Satyam Computer Rs 5.35 at Rs 1073, BHEL by Rs 20.50 to Rs 277, ITC Rs 13 at Rs 845, Infosys Rs 230 at Rs 7335 and SBI Rs 4.25 at Rs 214.75 on short covering.