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What is a common application of diamond?

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What is a common application of diamond?

(a) Drilling of rocks

(b) Sandpaper

(c) Wood finishing

(d) Polishing of metals

The question was asked during an interview.

This intriguing question comes from Abrasives, Silicate Structures and Polymorphism in portion Composite & Ceramic Materials of Engineering Material & Metallurgy

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Correct option is (a) Drilling of rocks

The best I can explain: Diamond is a natural abrasive and is known as the hardest material. It is used for wire drawing dies, drilling rocks, and dressing grinding wheels. It is also used for polishing of hard carbide metals, glass, and ceramics. Emery, on the other hand, is used for general purpose metal polishing.

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