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UPSC 2000 · Q109 · Science & Technology › Materials & Engineering · Save

Which one of the following materials is very hard and very ductile?

(a) Carborundum
(b) Tungsten
(c) Cast iron
(d) Nichrome
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Answer: (d) Nichrome
UPSC 2000 · Q111 · Science & Technology › Materials & Engineering · Save

Aluminium surfaces are often “anodized”. This means the deposition of a layer of

(a) chromium oxide
(b) aluminium oxide
(c) nickel oxide
(d) zinc oxide
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Answer: (b) aluminium oxide