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Space - Green Propulsion

1 UPSC Prelims MCQs tagged "Space - Green Propulsion". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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In the context of Green Propulsion, which of the following statement(s) is/are true regarding…
In the context of Green Propulsion, which of the following statement(s) is/are true regarding the advantage(s) of using Hydroxylammonium Nitrate (HAN)-based monopropellants over traditional Hydrazine?
1. AOnly 1
2. BOnly 2
3. CBoth 1 and 2
4. DNeither 1 nor 2
Answer and explanation
Correct answer: A
HAN-based green propellants offer higher density and higher specific impulse than hydrazine with much lower toxicity, so statement 1 is correct. Statement 2 is wrong because HAN monopropellants still need a catalyst and a high chamber temperature to decompose and ignite; they don't react spontaneously with the vacuum of space.
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Science & Technology UPSC GPSC-2026 Hard