Benchmark stock indices settled on a flat note in a volatile session on Wednesday as investors stayed on the sidelines ahead of RBI’s interest rate decision on Thursday. The BSE Sensex declined 34.09 points or 0.05 per cent to settle at 72,152. The NSE Nifty ended marginally up by 1.10 points or 0.01 per cent to 21,930.50. Except for IT, all sectors ended in green. Buying was seen in the PSU Bank and Realty sector, while IT saw some profit booking after an up-move in the last few sessions.