21. CO2 found in dip of depillaring areas in coal mines due to it is
22. Life of OXD-2M O2 meter works for a . . . . . . . . Period continuously, when fully charged.
23. Warmup time of OXD-2M instrument.
24. The relative humidity of saturated air is . . . . . . . .
25. White washing is not done from the face upto
26. At what percentage of black damp, the mine atmosphere becomes non explosive irrespective of % of fire damp.
27. Mine air should contain minimum . . . . . . . .% O2 in USSR.
28. The common test for . . . . . . . . consists of exposing a filter paper soaked with starch and potassium iodide solution of the gas.
29. SO2 specific gravity is
30. The temperature and humidity monitor consists of . . . . . . . . units.
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