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GS Paper IUPSC Prelims 2000
Health & Medicine
Question No. 230Interactive Test Mode
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Q230. Consider the following features of newer models of motor cars: 1. Radial tyres 2. Streamlined body 3. Multipoint fuel injection 4. Catalytic converter with exhaust Which of these features make the new models of motor cars more fuel efficient?

Consider the following features of newer models of motor cars:

  1. Radial tyres
  2. Streamlined body
  3. Multipoint fuel injection
  4. Catalytic converter with exhaust Which of these features make the new models of motor cars more fuel efficient?
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 2000 • Science and Technology

Correct Answer: Option (B) — 2 and 3

Concept & Option Breakdown

Standard Reference Verified

Feature 2 is correct: A streamlined body reduces aerodynamic drag, directly lowering the energy required to overcome air resistance and improving fuel efficiency. Feature 3 is correct: Multi-Point Fuel Injection (MPFI) delivers precise air-fuel mixtures to each cylinder under varying loads, optimizing combustion efficiency and reducing fuel consumption. Feature 1: While radial tyres offer modest rolling resistance benefits, in standard UPSC engineering keys it is secondary compared to core efficiency technologies. Feature 4 is incorrect: Catalytic converters reduce harmful tailpipe emissions ($CO, NO_x, HC$) into less harmful gases, but do not enhance fuel economy (they may slightly increase backpressure).

Elimination Heuristic & Exam Approach

Catalytic converters are purely emission control devices and have zero role in improving fuel efficiency.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2000 (Q230)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — 2 and 3

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Frequently Asked Questions — UPSC Prelims 2000 Q230

What is the official answer for UPSC Prelims 2000 GS Paper I Question 230 (Science and Technology)?

The official UPSC answer key for this 2000 Science and Technology (Health & Medicine) question is Option (B): "2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2000 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?

Catalytic converters are purely emission control devices and have zero role in improving fuel efficiency.

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