2022 · Q122
Consider the following statements:
- 1Aluminium powder is used as a solid fuel for rocket engines.
- 2Compared to liquid fuel propelled rocket engines, the thrust per amount of fuel burned is higher in solid fuel propelled rocket engines.
Which of the statements given above is/are correct?
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- A1 only
- B2 only
- CBoth 1 and 2
- DNeither 1 nor 2
Explanation
Statement 1 is true: aluminium powder is a standard fuel component in solid rocket propellants (e.g. APCP used in boosters), raising energy density. Statement 2 is false: 'thrust per amount of fuel burned' is specific impulse, and liquid engines (especially cryogenic LH₂/LOX at ~450 s) have substantially higher specific impulse than solids (~250–290 s) — solids win on simplicity and high absolute thrust, not fuel efficiency. Hence 1 only. Corroborated by ExamRobot (Answer Verified), prepp.in, MissionCAPFHub, theexampillar and abhipedia — the stored key's C (Both) was wrong.