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Exam: UPSC Civil Services Preliminary Examination 2025, GS Paper 1, held on 25 May 2025, 9:30 AM to 11:30 AM
Question: In the context of electric vehicle batteries, how many of the listed elements make up battery cathodes?
Correct Answer: Only three

Explanation: Electric vehicle batteries use lithium ion chemistry. Their cathodes commonly include cobalt, lithium and nickel because they help store and release energy. Graphite is not a cathode material because it is used in the anode. This makes three of the four elements part of the cathode group.

Verified Sources: UPSC Prelims 2025 answer keys from ForumIAS, IAS Gyan and OnlyIAS; battery chemistry data from CATL, Panasonic and LG Chem; Britannica articles on lithium ion technology.

Useful for: UPSC | State PCS | Science and Tech | EV Technology | Prelims Fact Learning
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