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UPSC 2007: Which one of the following types of glass can cut off ultraviolet rays?
(a)Soda glass
(b)Pyrex glass
(c)Jena glass
(d)Crookes glass
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Not attemptedCorrect Answer: (d) Crookes glass
Crookes glass is doped with cerium and other rare-earth oxides that strongly absorb ultraviolet radiation, so it is used to block UV in protective eyewear. Soda, Pyrex and Jena glasses lack this high UV-absorption property and therefore cannot cut off ultraviolet rays. ([testbook.com](https://testbook.com/question-answer/which-of-the-following-types-of-glass-can-cut-off--618228cffa83bd34fcc3adcc?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2007 Science & Technology question?▼
The correct answer is option (d): Crookes glass. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Materials & Engineering question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2007, GS Paper 1, as Question 112. It falls under Science & Technology > Materials & Engineering.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Materials & Engineering?▼
UPSC has asked 23 questions from Materials & Engineering (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.