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Question
Hardness of rock can be tested in situ using
'kSy dh dBksjrk dk ijh{k.k fdlds }kjk LoLFkkus fd;k tk ldrk gS\ 
A.
Smith's test    
B.
Schmidt Hammer test
C.
Acid test    
D.
Crystallization test
Answer ( Option B)

Schmidt Hammer test

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