In the fifth bi-monthly review of the policy, the central bank also revised GDP growth downwards to 5 per cent for 2019-20 from 6.1 per cent projected in its October policy.
After opening higher by 84.17 points at 40,934.46 in opening deals, the 30-share index pared all gains to turn negative after the policy announcement by the Reserve Bank of India (RBI).
It was trading 100.56 points, lower at 40,749.73 at 1149 hours. Similar movement was seen on the NSE and the broader NSE Nifty was trading 11.25 points, or 0.09 per cent, down at 12,031.95 at 1212 hrs.
Top losers in the Sensex pack included Sun Pharma, Yes Bank, Bharti Airtel, Tata Steel, Tata Motors, IndusInd Bank shedding up to 2 per cent.
On the other hand, TCS, Tech Mahindra, ITC, Larsen & Toubro, Reliance Industries, ICICI Bank and Infosys bucked the trend and were trading in the positive territory with gains of as much as 1.20 per cent.
Rate-sensitive banking stocks faced the heat, with the BSE bankex falling 0.36 per cent. BSE realty index also turned red.
The rupee was also trading lower by 8 paise at 71.61 in afternoon session.
Brent futures, the global oil benchmark, fell 0.32 per cent to USD 62.80 per barrel. DRR DRR