Benchmark indices Sensex and Nifty fell for the second consecutive session on Thursday as investors fretted over plunging rupee and rising crude oil prices, while August futures and options (F&O) expiry further added to market volatility.

The BSE benchmark Sensex slipped 33 points, or 0.08 per cent, to 38,690. It shuttled between 38,819.06 and 38,581.83. The NSE Nifty declined 15 points, or 0.13 per cent, to 11,677. Intra-day, the 50-share index moved between 11,698.80 and 11,639.70.

Investors offloaded their long bets in F&O segment instead of carrying them forward to the next series for September, adding to volatility.

The Indian rupee plunged to a new life-time low of 70.85 against the dollar (intra-day) on Thursday. Further, global oil prices going past $77 a barrel on a fall in US crude inventories and expected disruptions to supply from Iran and Venezuela dented investor sentiments on domestic bourses.

However, investors will be keenly awaiting the June-quarter GDP data to be announced tomorrow, which will be one of the factors to decide the market course.

Sensex, Nifty edge lower on rupee woes, derivatives expiry