Rising for the second straight session, the Sensex at the Bombay Stock Exchange gained 185 points, or 1 percent, to 18,326, on Friday, after some good corporate results, and firm European markets lifted investor confidence. The Nifty at the National Stock Exchange added 58 points, or 1.1 percent, to 5,486.Stock markets in Japan, China, Hong Kong, Singapore and South Korea ended mixed.