The Sensex at the Bombay Stock Exchange dropped 129 points, or 0.7 percent, to close at 17,392, amid a falling rupee, and weakness in global stock markets, on Monday. The Nifty at the National Stock Exchange lost 42 points, or 0.8 percent, to 5,275. Stock markets in Japan, China, Hong Kong, South Korea and Singapore dropped between 1.2 percent and 2.4 percent, on global growth concerns.