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UPSC Prelims 2022 Paper-1 📅 05 Jun, 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 are correct?

A
(a) 1 and 3 only
B
(b) 3 only
C
(c) 1 and 2 only
D
(d) 2 and 3 only
Result Summary
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UPSC Prelims
2022 • 05 Jun, 2022 • Paper-1
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 are correct?
Correct Answer
(d) 2 and 3 only
Natural Occurrence: Statement 1 is demonstrably false. Nanoparticles exist abundantly and naturally in the environment completely independent of human activity.......
Ref/Book : UPSC Prelims 2022
Ref. Subject Science & Technology
Chapter -
Ref. Topic Chemistry / Materials
Pg. No -
💡 Analysis & Explanation
Natural Occurrence ▼
Statement 1 is demonstrably false. Nanoparticles exist abundantly and naturally in the environment completely independent of human activity. They are routinely generated by natural phenomena such as violent volcanic eruptions, intense forest fires, and even simple sea spray.
Industrial Application ▼
Statement 2 is correct. The cosmetics industry heavily incorporates metallic oxide nanoparticles—specifically Titanium Dioxide and Zinc Oxide—into sunscreens and lotions due to their excellent ability to block UV radiation while remaining transparent on the skin.
Toxicological Risk ▼
Statement 3 is correct. The uncontrolled release of engineered commercial nanoparticles into water systems and soils is a highly documented, severe environmental health concern, as their microscopic size allows them to aggressively penetrate human cellular membranes, causing potential systemic toxicity.
Conclusion ▼
Thus, statements 2 and 3 represent accurate scientific realities regarding nanomaterials.
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