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GS Paper IUPSC Prelims 1999
Health & Medicine
Question No. 250Interactive Test Mode
00:00
+2-0.66

Q250. Strips of two metals A and B are firmly joined together as shown in the figure. On heating, A expands more than B does. If this jointed strip is heated, then it will appear as:

Strips of two metals A and B are firmly joined together as shown in the figure.

On heating, A expands more than B does. If this jointed strip is heated, then it will appear as:

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UPSC Prelims 1999 Science and Technology (Health & Medicine) Question 250 Diagram
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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 (B)

Concept & Option Breakdown

Standard Reference Verified

When two different metals with unequal coefficients of linear thermal expansion are bonded into a bimetallic strip and heated, the metal with the higher coefficient of expansion expands more. Here, since metal A expands more than metal B, strip A must form the longer outer arc of the curve, while strip B forms the inner arc, bending the composite strip downward into the shape shown in (b).

Elimination Heuristic & Exam Approach

The layer with greater expansion always forms the outer (convex) curve of the bend when heated.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 1999 (Q250)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — (b)

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Frequently Asked Questions — UPSC Prelims 1999 Q250

What is the official answer for UPSC Prelims 1999 GS Paper I Question 250 (Science and Technology)?

The official UPSC answer key for this 1999 Science and Technology (Health & Medicine) question is Option (B): "(b)". 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?

The layer with greater expansion always forms the outer (convex) curve of the bend when heated.

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