Rising for the second straight day, the Sensex at the Bombay Stock Exchange surged 276 points, or 0(point)9 percent, to close at 31,568. The Nifty at the National Stock Exchange jumped 87 points, to 9,853.At the forex market, the rupee weakened 2 paise, to 64.12 against the dollar.Gold declined 100 rupees, to 29,700 rupees per ten grams in Delhi. And Brent crude oil futures fell 27 cents, to 51.60 dollars a barrel.