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Q: Hardness of the rock can be tested in situ using.
  • A. Smith's test
  • B. Schmidt Hammer test
  • C. Acid test
  • D. Crystallization test
Correct Answer: Option B - The Schmidt hammer rebound test was developed to determine the compressive strength of concrete, and has been used to determine the hardness and compressive strength of rock material. This equipment is portable, easy to use and can be applied both in laboratory and in the field.
B. The Schmidt hammer rebound test was developed to determine the compressive strength of concrete, and has been used to determine the hardness and compressive strength of rock material. This equipment is portable, easy to use and can be applied both in laboratory and in the field.

Explanations:

The Schmidt hammer rebound test was developed to determine the compressive strength of concrete, and has been used to determine the hardness and compressive strength of rock material. This equipment is portable, easy to use and can be applied both in laboratory and in the field.