Indian shares dropped by 1 per cent and the Nifty 50 recorded its worst session since July, dragged by a sharp downfall in metals on concerns of default by China's Evergrande Group, while investors awaited further cues on monetary policy by the US Federal Reserve. The blue-chip NSE Nifty 50 index closed down 1.07 per cent at 17,396.9 on Monday, and the benchmark S P BSE Sensex fell 0.9 per cent to 58,490.93.