Mains Answer Writing - 19 Jan, 2026

GS3

Science & Technology

10 marks

“PSLV is often described as ISRO’s workhorse launch vehicle.”
Explain the design features and stage-wise functioning of PSLV that justify this description.

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Tips for your answer

Start by justifying the term “workhorse” in one line: Briefly link it to high success rate, versatility of missions, and frequent usage before moving into technical details.
Explain stage-wise design with purpose, not just fuel: For each stage (PS1–PS4), mention why that stage exists (liftoff thrust, control, velocity gain, precision placement), not merely the propellant.
Conclude by linking design to outcomes: End by connecting the multi-stage mixed propulsion design to reliability, orbital accuracy, and commercial confidence, reinforcing why PSLV became ISRO’s workhorse.

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