71. Rock burst is explained by the theory of
72. For a bulking factor of 1.5, the height of immediate roof for extraction thickness of H is
73. The material used for make of hydraulic prop
74. The rock sample having 5.4 cm diameter and 2.7 cm thickness failed at a compressive load of 2403.45 kg while carrying out Brazilian test. The tensile strength of rock sample will be
75. Erecting the supports in such a manner that the distance between supports are according to a specified pattern called
76. Wide stall method of mining widely used in . . . . . . . . country.
77. Rocks said to be floggy if bedded planes are separated by
78. Visual test is carried out if the roof is upto . . . . . . . . m from strong focussed beam of light.
79. Coal India Limited was formed by Central Government in
80. Chasnalla disaster (1975) was due to
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