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GS Paper IUPSC Prelims 2007
Health & Medicine
Question No. 319Interactive Test Mode
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Q319. Which one of the following does not contain silver?

Which one of the following does not contain silver?

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 2007 • Science and Technology

Correct Answer: Option (B) — German silver

Concept & Option Breakdown

Standard Reference Verified
  • German silver (nickel silver) contains no elemental silver; it is an alloy of copper (~60%), zinc (~20%), and nickel (~20%) named for its silvery appearance.
  • Horn silver is chlorargyrite (AgCl).
  • Ruby silver refers to pyrargyrite (Ag₃SbS₃) or proustite (Ag₃AsS₃).
  • Lunar caustic is silver nitrate (AgNO₃).
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2007 (Q319)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (B) — German silver

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Frequently Asked Questions — UPSC Prelims 2007 Q319

What is the official answer for UPSC Prelims 2007 GS Paper I Question 319 (Science and Technology)?

The official UPSC answer key for this 2007 Science and Technology (Health & Medicine) question is Option (B): "German silver". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2007 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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