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Which of the following is not a synthetic abrasive?(a) Carbides of aluminium(b) Boric acid(c) Corundum(d) SiliconThis question was addressed to me in my homework.My question comes from Miscellaneous Materials topic in section Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Answer»

Correct choice is (c) CORUNDUM

For EXPLANATION I WOULD say: Synthetic abrasives or artificial abrasives can be prepared of desired quality and their manufacturing allows the exact duplication of the product. Examples of synthetic abrasives are carbides of aluminium, silicon, boric acid etc. Corundum is an example of a NATURAL abrasive.



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