The Nikkei India Composite PMI Output Index, which maps both manufacturing and services sectors, dropped from 54.3 in March (37-month high) to 52.8 in April, pointing to a softer expansion in private sector activity across the country.
"Having accelerated to the fastest in over three years during March, activity growth across India's private sector took a step back in April," said Pollyanna De Lima, economist at Markit, which compiles the survey.
Meanwhile, the Nikkei Services Business Activity index was down from 54.3 in March to 53.7 in April.
The survey noted that April data highlighted a general lack of pressure on the capacity of Indian service providers as unfinished business declined.
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Part of additional cost burdens was passed on to clients, as both manufacturers and service providers raised their selling prices again in April, Nikkei said.
Meanwhile, services firms' sentiment weakened slightly in April, with the degree of optimism being modest by historical standards.
"Nevertheless, a softer expansion in activity, combined with unchanged employment and a dip in business expectations among the latter suggest that companies are not fully convinced about the recovery and that March's stronger numbers might have been a one-off," Lima added.
While this was the first rate cut after a gap of six months, RBI has lowered its rate by 1.5 per cent cumulatively since January last year. However, the industry still wants further rate cuts from the central bank.