81. If a person affected by CO2, recovery done by . . . . . . . .
82. The weight of GL-60 lamp with fuel is . . . . . . . . in kg.
83. In a hot day the relative humidity will be nearly
84. CO is soluable 100 vol. of water desolving 2.3 vols. of gas at . . . . . . . .°C.
85. Inclined water gauge can be read upto . . . . . . . . mm and in same cases even upto . . . . . . . . mm depending upon scale graduation.
86. Shelf life of the MSA co detector tube is . . . . . . . .
87. Drykata for sedimentary workers.
88. The S.I unit of water vapour pressure in air . . . . . . . .
89. The velocity of air at working face at . . . . . . . . is reasonable.
90. The methane drainage system used to shut off when % of methane falls below.
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