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GS Paper IUPSC Prelims 2010
Health & Medicine
Question No. 297Interactive Test Mode
00:00
+2-0.66

Q297. Hydrogen fuel cell vehicles produce one of the following as “exhaust”:

Hydrogen fuel cell vehicles produce one of the following as “exhaust”:

Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2010 • Science and Technology

Correct Answer: Option (C) — H2O

Concept & Option Breakdown

Standard Reference Verified

In a hydrogen fuel cell, hydrogen gas is combined electrochemically with oxygen from ambient air via the reaction 2H₂ + O₂ → 2H₂O to generate electricity. The sole primary chemical byproduct and exhaust emitted is water vapor (H₂O).

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2010 (Q297)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — H2O

Related & Repeated Prelims PYQs (2)

Questions from other UPSC Prelims years testing the same or closely linked concept.

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2024 • Q14891% Match

Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?

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1997 • Q36183% Match

Which one of the following has the highest fuel value?

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2009 • Q298Health & Medicine

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Which one of the following statements is correct?

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2001 • Q303Health & Medicine

In an atom, the order of filling up of the orbitals is governed by:

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2001 • Q304Health & Medicine

A radioactive substance has a half-life of four months. Three-fourth of the substance would decay in:

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Which one of the following is NOT radioactive?

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Frequently Asked Questions — UPSC Prelims 2010 Q297

What is the official answer for UPSC Prelims 2010 GS Paper I Question 297 (Science and Technology)?

The official UPSC answer key for this 2010 Science and Technology (Health & Medicine) question is Option (C): "H2O". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2010 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

To solve Health & Medicine questions in UPSC Prelims, identify extreme modifiers, verify core NCERT conceptual definitions, and eliminate mutually contradictory statement pairs before locking your final option.

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