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UPSC CAPF (AC) 2024 Paper I · Question 15

Question 15 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 · Q15 · General Science · Chemistry

    Which among the following are the main ingredients for manufacturing of glass?

    1. Silica, sodium carbonate, borax, alumina and cullets
    2. Iron oxide, lead, sodium bicarbonate, alumina and cullets
    3. Magnesium carbonate, alumina, silica and cullets
    4. Iron oxide, sodium, alumina, silica and cullets

    काँच के विनिर्माण के लिए मुख्य घटक, निम्नलिखित में से कौन-से हैं?

    1. सिलिका, सोडियम कार्बोनेट, बोरेक्स, ऐलुमिना और भग्न काँच
    2. लोह ऑक्साइड, सीसा, सोडियम बाइकार्बोनेट, ऐलुमिना और भग्न काँच
    3. मैग्नीशियम कार्बोनेट, ऐलुमिना, सिलिका और भग्न काँच
    4. लोह ऑक्साइड, सोडियम, ऐलुमिना, सिलिका और भग्न काँच
    Show answer

    Answer: (1) Silica, sodium carbonate, borax, alumina and cullets

    उत्तर: (1) सिलिका, सोडियम कार्बोनेट, बोरेक्स, ऐलुमिना और भग्न काँच

    Glass is made by melting silica (sand) with a flux such as sodium carbonate (soda ash), with additives like borax (for borosilicate glass) and alumina for strength and durability; cullet (broken waste glass) is added because it melts easily and lowers the energy needed. The other options leave out the soda flux or list substances like sodium metal, sodium bicarbonate or iron oxide (an impurity that colours glass) that are not main ingredients.

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