51. H2S inflammable limits.
52. The formula for finding density of moist air in S.I units in kg/m3.
53. The cause which tend to cool the air in mine . . . . . . . .
54. The effect of breathing air containing CO % in air is 0.02, the symptoms are
55. Range of middle infrared in optical spectrum is
56. What are the sources which contributes the moisture content of mine air.
57. To combat fire in goaf the following as introduced
58. The sp.gr of nitrogen.
59. The poisonous gas is . . . . . . . .
60. Multi gas detector manufactured by the company.
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