41. Mine air should contain minimum . . . . . . . .% O2 in USA.
42. With 0.15% of CO in air the bird shows
43. An instrument used to find relative humidity of air in mines.
44. Shelf live of the CO tubes in multi gas detector
45. A person doing exercise consumes oxygen at . . . . . . . .
46. The lowest possible temperature and is the point at which all heat should be extracted from a substance, if it can be cooled sufficiently called
47. 25% of black damp (75% air, i.e. 15% O2 air 3% CO2) the physiological effect will be causes is
48. After affects of CO poisoning are
49. Plates of oldham cap lamp battery is immersed in a solution. What is composition of solution?
50. The bulb of kata thermometer covered with . . . . . . . . cloth.
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