Gillmore needle is used for_______________?
Correct answer: C. Evaluating the setting time of plaster of pris
- A. Testing the strength of plaster of paris
- B. Testing the metal hardness
- C. Evaluating the setting time of plaster of pris
- D. Testing the purity of noble metals
Explanation
A Gillmore needle determines the setting time of gypsum by testing when the material resists penetration. It is not an instrument for measuring plaster strength or metal hardness.
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