31. The relative rates of disfusion of number of gases vary inversely as square root of their relative densities called
32. CO is than air
33. Metal mines, not deeps, say upto 300 m, the quantity of air that should go down the incline should be . . . . . . . . m3/min.
34. For judging a working place suitable for man to work efficiently, without discomfort it is necessary to know.
35. Large concentrations of black damp in mins. can be removed only by improving
36. If dry time is used, the result of cooling power by
37. The safe limit of CO in the air of an under ground working for persons to work is
38. If CO2 replaces air by . . . . . . . .% severe distress for few min.
39. The weight of OXD-2M compact instrument
40. SO2 produced in mines in small quantities during
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