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Doctors Medicines MCQs Q&A

  1. Garnet
  2. Emery
  3. Boron-carbide
  4. Corundum
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1 Answers

Option 3 : Boron-carbide

Explanation:

Abrasives are classified into two categories:

Natural Abrasives:

  • Garnet, Corundum, Emery (impure corundum), Calcite (calcium carbonate), Diamond dust, Novaculite, Pumice, Rouge, Sand, Sandstone, Tripoli, Powdered feldspar, Staurolite

Synthetic Abrasives:

  • Boron carbide, Borazon (cubic boron nitride or CBN), Ceramic, Ceramic aluminium oxide, Ceramic iron oxide, Dry ice, Glass powder, Steel abrasive, Zirconia alumina, Slags
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