Question

which was Isro's first launch vehicle

Answer 1

Answer:

The first experimental flight of SLV-3, in August 1979, was a failure. The first successful launch took place on 18 July, 1980. It was a four-stage rocket with all solid-propellant motors. The first launch of the SLV took place in Sriharikota on 10 August 1979.

Explanation:

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Answer 2

Satellite Launch Vehicle-3 (SLV-3) was India's first experimental satellite launch vehicle, which was an all solid, four stage vehicle weighing 17 tonnes with a height of 22m and capable of placing 40 kg class payloads in Low Earth Orbit (LEO).