In the Mohr's scale of hardness, the minerals in increasing sequence of hardness are
A. Calcite, Gypsum, Topaz, Diamond
B. Topaz, Gypsum, Calcite, Diamond
C. Calcite, Gypsum, Diamond, Topaz
D. Gypsum, Calcite, Topaz, Diamond
Answer: Option D
This Question Belongs to Mining Engineering >> Rock Mechanics And Roof Supporting
Related Questions on Rock Mechanics and Roof Supporting
Which of the following is not considered in Bieniawski's geo-mechanics classification?
A. rock strength
B. RQD
C. ground water condition
D. layers thickness
What is the expected range of LBC of a 2.5 m long, 15 cm diameter timber prop?
A. 5 - 10 KN
B. 15 - 20 KN
C. 50 - 60 KN
D. 120 - 130 KN
A. point load test
B. servocontrolled test
C. displacement test
D. post peak test
A. 1.25
B. 1.50
C. 2.25
D. 1.00
Join The Discussion