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Q: In dorry abrasion test, the hardness of the rock sample is expressed in an empirical formula____.
  • A. Coefficient of hardness = 16 – loss in weight (in gm) /5
  • B. Coefficient of hardness = 20 – loss in weight (in gm) /5
  • C. Coefficient of hardness = 25 – loss in weight (in gm) /5
  • D. Coefficient of hardness = 20 – loss in weight (in gm) /3
Correct Answer: Option D -
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Explanations:

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