Science & Tech

2 questions

• 2025 · Question 43 · Materials Science

  In the context of electric vehicle batteries, consider the following elements : I. Cobalt II. Graphite III. Lithium IV. Nickel How many of the above usually make up battery cathodes?

  Choose your answer

  (a)Only one(b)Only two(c)Only three(d)All the four

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  Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)

• 2025 · Question 81 · Materials Science

  Consider the following statements : Statement I : Some rare earth elements are used in the manufacture of flat television screens and computer monitors. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?

  Choose your answer

  (a)Both Statement I and Statement II are correct and Statement II explains Statement I(b)Both Statement I and Statement II are correct but Statement II does not explain Statement I(c)Statement I is correct but Statement II is not correct(d)Statement I is not correct but Statement II is correct

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  Source: UPSC, Civil Services (Preliminary), General Studies Paper I (opens in a new tab)