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GS Paper IUPSC Prelims 1999
Health & Medicine
Question No. 277Interactive Test Mode
00:00
+2-0.66

Q277. Consider the following statements: An ordinary light bulb has a rather short life because the: 1. filament wire is not uniform. 2. bulb cannot be evacuated completely. 3. wires supporting the filament melt at high temperatures. Which of the above statements are correct?

Consider the following statements: An ordinary light bulb has a rather short life because the:

  1. filament wire is not uniform.
  2. bulb cannot be evacuated completely.
  3. wires supporting the filament melt at high temperatures. Which of the above statements are correct?
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 1999 • Science and Technology

Correct Answer: Option (D) — 1, 2 and 3

Concept & Option Breakdown

Standard Reference Verified
  • Statement 1 is correct: Non-uniformity in the filament wire causes non-uniform resistance, leading to local hotspots and rapid filament burn-out.
  • Statement 2 is correct: Total evacuation is impossible in mass manufacturing; residual gases cause oxidation and vaporization of the hot filament.
  • Statement 3 is correct: The lead-in support wires for the filament undergo thermal stress and degradation/melting over prolonged high operating temperatures.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1999 (Q277)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — 1, 2 and 3

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Frequently Asked Questions — UPSC Prelims 1999 Q277

What is the official answer for UPSC Prelims 1999 GS Paper I Question 277 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Health & Medicine) question is Option (D): "1, 2 and 3". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 1999 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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Next QuestionConsider the following statements regarding a motor car battery: 1. The voltage is usually 12 V. 2. Electrolyte used is hydrochloric acid. 3. Electrodes are lead and copper. 4. Capacity is expressed in ampere-hour. Which of the above statements are correct?