UPSC Previous Year Question | Prelims GS | 2025

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?

  1. Both Statement I and Statement II are correct and Statement II explains Statement I
  2. Both Statement I and Statement II are correct but Statement II does not explain Statement I
  3. Statement I is correct but Statement II is not correct
  4. Statement I is not correct but Statement II is correct

Answer

Correct Answer

Both Statement I and Statement II are correct and Statement II explains Statement I

Explanation

Certain rare earth elements possess phosphorescent (light-emitting) properties (Statement II), which is precisely why they are used as phosphors in the manufacture of flat television screens and computer monitors (Statement I). Statement II thus explains Statement I.

Topics: rare earth elements, science and technology