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2 questions · 1999 · answers as per the UPSC key

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UPSC 1999 · Q109 · Science & Technology › Materials & Engineering · Save

Match List I (Naturally occurring substances) with List II (Elements) and select the correct answer using the codes given below the Lists:

List I I. Diamond II. Marble III. Sand IV. Ruby

List II A) Calcium B) Silicon C) Aluminium D) Carbon

Codes:

(a) I-C, II-A, III-B, IV-D
(b) I-D, II-B, III-A, IV-C
(c) I-B, II-A, III-C, IV-D
(d) I-D, II-A, III-B, IV-C
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Answer: (d) I-D, II-A, III-B, IV-C
UPSC 1999 · Q127 · Science & Technology › Materials & Engineering · Save

Consider the following statements:

I. Glass can be etched or scratched by diamond. II. Glass can be etched or scratched by hydrofluoric acid. III. Glass can be etched or scratched by aqua regia. IV. Glass can be etched or scratched by concentrated sulphuric acid.

Which of these statements are correct?

(a) I and IV
(b) II and III
(c) I and II
(d) II and IV
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Answer: (c) I and II