UPSC CAPF (AC) 2024 Paper I · Question 18

Question 18 of the UPSC CAPF (AC) 2024 Paper I (4 August 2024). Try it first, then open the answer and explanation.

1. CAPF 2024 · P-I · Q18 · General Science · Chemistry

   Which one among the following is used in the manufacture of ultra-violet protective glasses?

   1. Aluminium oxide
   2. Tungsten oxide
   3. Molybdenum oxide
   4. Cerium oxide

   निम्नलिखित में से किसका उपयोग पराबैंगनी रक्षी काँचों के विनिर्माण में किया जाता है?

   1. ऐलुमिनियम ऑक्साइड
   2. टंग्स्टेन ऑक्साइड
   3. मॉलिब्डनम ऑक्साइड
   4. सीरियम ऑक्साइड
   Show answer

   Answer: (4) Cerium oxide

   उत्तर: (4) सीरियम ऑक्साइड

   Cerium oxide (ceria, CeO2) strongly absorbs ultraviolet radiation while remaining transparent to visible light, so it is added to glass to make UV-protective glasses (it is also widely used to polish glass).

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