After making a marginally higher start at 18,642.43, the 30-share index settled lower by 77.03 points, or 0.41 per cent, at 18,552.12, after rupee hit all-time low of 60.62 against the US currency in mid-session on heavy dollar demand.
Similarly, the wide-based National Stock Exchange index Nifty fell by 20.40 points, or 0.36 per cent, to close at 5,588.70. Also, SX40 index, the flagship index of MCX-SX, closed 49.23 points, or 0.44 per cent lower at 11,048.71.
They said the selling was more confined to companies having exposures to overseas markets such as auto, metal and banking sectors.
Cautious investors offloaded their holdings before the monthly settlement in the derivatives segment tomorrow, they added.
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Out of the 30 BSE shares, 18 ended lower led by Bharti Airtel falling 5.74 per cent to Rs 278.45, followed by Mahindra and Mahindra closing down by 4.63 per cent at Rs 912.15.
Bucking the general weakening tend, stocks of software exporting companies ended with gains on hopes of better earnings following dollar strengthening. Country's largest software services firm TCS closed 2.84 per cent higher at Rs 1,433.65.
Sectorally, the auto sector index fell by 1.79 per cent to 10,347.65 and metal sector losing 1.31 per cent to settle at 7,372.83.