The 30-share index opened higher at 20,915.76 and moved up to 20,970.92 on buying in capital goods, auto and realty shares on the back persistent capital inflows from foreign funds coupled with higher global cues.
However, it later dropped to 20,831.17 and was quoted at 20,833.52 at 1030hrs, showing a marginal loss of 7.72 points, or 0.04 per cent, from its last weekend's level.
However, the 50-share NSE benchmark Nifty looked up by 8.95 points, or 0.14 per cent, to 6,198.30 at 1030 hrs.
However, L&T rose by 4.32 pct followed by Maruti 3.67 pct, Hindalco Ind 2.57 pct, Tata Motors 2.55 pct, SSLT 1.64 pct, Cipla 1.58 pct, Gail India 1.23 pct and M&M 1.22 pct.
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Foreign institutional investors (FIIs) bought shares worth Rs 1752.98 crore on last Friday, according to provisional data from the stock exchanges.
Asian markets rose in early session as traders continued buying spree that began last week on bets that US Federal Reserve will continue its monetary stimulus for the world's largest economy.