India's economy expanded by a record 20.1 percent between April and June, official data showed Tuesday, boosted by the manufacturing and construction sectors as growth rebounded from last year's strict months-long pandemic lockdown.

It was the biggest growth on record since New Delhi started publishing quarterly statistics in 1996, and was broadly expected by analysts after a historic 24.4 percent contraction in the same period last year when most factories ground to a halt.

Exports grew 39 percent compared to the same quarter last year, contributing 23.7 percent of the period's GDP, indicating strong global demand for Indian goods including petroleum products, gems and jewellery.

"Economic activity has been reviving since July and has picked up momentum," Kotak Mahindra Bank senior economist Upasna Bhardwaj told AFP.

"As the vaccination pace picks up, we expect momentum to pick up further, although we remain wary on the evolution of Delta variant cases."

Compared to the previous quarter in 2021 however, Asia's third-largest economy contracted 16.9 percent, according to an AFP estimate, reflecting the impact of a record-breaking surge in virus infections and deaths in April and May.

The government does not release quarter-on-quarter economic data.

ICRA ratings agency chief economist Aditi Nayar warned that while manufacturing and construction, as well as private consumption and investment, helped to drive growth, the sectors "remained well below their pre-Covid levels".

She added that consumer confidence needed to improve for contact-intensive sectors to experience a sustainable recovery.

India's growth outlook has meanwhile been revised downwards by analysts amid uncertainty over how badly the economy has been hit.

Labourers work on scaffolding in the Indian financial hub of Mumbai
Labourers work on scaffolding in the Indian financial hub of Mumbai AFP / Punit PARANJPE

The International Monetary Fund in July downgraded India's annual growth forecast to 9.5 percent for the year to March 2022 from its previous projection of 12.5 percent.

Despite this, the South Asian nation of 1.3 billion people is expected to grow faster than any other country in 2021 due to the previous year's record contraction of 7.3 percent.

The Reserve Bank of India has maintained an accommodative stance on monetary policy to support the economy even as inflation pressures rise.

There are fears that a new wave of coronavirus infections could hit India in the coming months.

Cases have been rising above 40,000 nationwide over the past week, fuelled by a jump in infections in the southern state of Kerala blamed on a major local festival.

Kerala has since imposed a night curfew from next week to stem the rise in cases.

The pace of vaccinations across the country has risen significantly in recent weeks, with authorities giving more than 10 million Covid-19 jabs in a single day on Tuesday for only the second time.

India has recorded more than 32 million infections and nearly 439,000 deaths, the second highest in the world after the United States.

But experts say that due to underreporting, India's true toll could be much higher.