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UPSC 2022: Consider the following statements: 1. Other than those made by humans, nanoparticles do not exist in nature. 2. Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics. 3. Nanoparticles of some commercial products which enter the environment are unsafe for humans. Which of the statements given above is/are correct?
(a)1 only
(b)3 only
(c)1 and 2
(d)2 and 3
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Not attemptedCorrect Answer: (d) 2 and 3
Naturally occurring nanoparticles exist in volcanic ash, ocean spray, dust, etc., so statement 1 is false. Metallic-oxide nanoparticles such as TiO₂ and ZnO are widely used in sunscreens and other cosmetics, validating statement 2. Engineered nanoparticles released from commercial products can pose toxic risks to humans and ecosystems, making statement 3 true. Hence only 2 and 3 are correct (option d). ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2022-question-98/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2022 Science & Technology question?▼
The correct answer is option (d): 2 and 3. 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 2022, GS Paper 1, as Question 98. 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.