a) Less than 50 N/mm2
b) Greater than 100 N/mm2
c) 155 N/mm2
d) 10 N/mm2
Answer: b
Explanation: Crushing strength or compressive strength of a stone is the load per unit area at which the stone starts cracking. It should be greater than 100 N/mm2 to ensure sufficient strength for use in construction.
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