71. Sand and gravel are . . . . . . . .
72. For conversion of weight standards to dust count standard, it is accepted that 1 mg/m3 corresponds to about . . . . . . . . particles.
73. Mine rescue rules was incorporated in the year
74. Lead antimony plates carrying active materials and immersed in . . . . . . . .% in solution of H2SO4 and distilled water.
75. The maximum explosion violence is produced when the fire damp in the explosive mixture of mine air is . . . . . . . .
76. Who has power to give permission for reversal of air . . . . . . . .
77. The disease caused due to dusty atmosphere containing large amount of smoke
78. In light stone dust barrier the amount of stone dust is loaded is . . . . . . . .
79. The battery cells used . . . . . . . . in GL-60 flame safety lamp.
80. For safe working, the air velocity should not exceed . . . . . . . m/s where carbide lamps used.
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