The Sensex at the Bombay Stock Exchange on Tuesday jumped 207 points, or 1.2 percent, to 17,358 after an unexpectedly sharp rate cut by the Reserve Bank, and in tandem with positive European bourses. The Nifty at the National Stock Exchange rose 64 points, or 1.2 percent, to 5,290.But stock markets in Japan, China, Hong Kong, South Korea and Singapore lost between 0.1 percent and 0.9 percent.