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GS Paper IUPSC Prelims 2007
Health & Medicine
Question No. 299Interactive Test Mode
00:00
+2-0.66

Q299. Which one of the following types of glass can cut off ultraviolet rays?

Which one of the following types of glass can cut off ultraviolet rays?

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 (D) — Crookes glass

Concept & Option Breakdown

Standard Reference Verified
  • Crookes glass contains cerium oxide (CeO₂) and other rare-earth oxides that strongly absorb ultraviolet radiation while allowing visible light to pass through. It is commonly used in protective sunglasses and optical laboratory lenses.
  • Soda-lime glass and Jena glass transmit a significant portion of UV light.
  • Pyrex glass is a borosilicate glass known primarily for its low coefficient of thermal expansion and thermal shock resistance.
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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2007 (Q299)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (D) — Crookes glass

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Frequently Asked Questions — UPSC Prelims 2007 Q299

What is the official answer for UPSC Prelims 2007 GS Paper I Question 299 (Science and Technology)?

The official UPSC answer key for this 2007 Science and Technology (Health & Medicine) question is Option (D): "Crookes glass". 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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