The Nikkei Services Business Activity index, which maps the services sector activity, fell from 53.7 in April to 51.0 in May, pointing to a slight expansion in business activity which has been the weakest since last November.
A reading above 50 represents expansion, while one below this level means contraction.
Meanwhile, the Nikkei India Composite PMI Output Index, which maps both manufacturing and services sectors, fell to a six-month low of 50.9 in May, from 52.8 in April.
Manufacturing production growth eased in May, which combined with the slowdown in services resulted in a weaker increase in private sector output, the survey said.
Lima further said that "ongoing weakness in manufacturing and services was evident in May, with output growth losing momentum for a second straight month. Overall expansion across the two sectors was the lowest since last November, as was the case for new orders".
Meanwhile, the confidence of service providers dipped to a three-month low. Though services companies expect output to increase over the coming 12 months, but the degree of optimism weakened to the lowest since February.
Earlier in April, the RBI cut its policy rate by 0.25 per cent to 6.5 per cent. While this was the first rate cut after a gap of six months, the RBI has lowered its rate by 1.5 per cent cumulatively since January 2015.
However, the industry still wants further rate cuts from the apex bank to boost investment.
