41. Breathing get doubled, when CO2 present in a mine is about . . . . . . . .
42. The dustiness can be formed at stone crushing sites about . . . . . . . .
43. Safety torches are . . . . . . . . apparatus.
44. The chemical contains in the lower container of acetylene portable hand lamp.
45. The hot gases of flame rise by . . . . . . . . to the top of the gauzes and through them and the outlet holes at the bonnet.
46. Wire gauze is . . . . . . . . conductor of heat.
47. The length of bore hole should not be less than . . . . . . . . which working near water logged workings.
48. When light falls upon a surface, part of its reflected and part absorbed called.
49. The gasses exit by . . . . . . . . holes in the front of the old ham battery.
50. The intensity of light measured by . . . . . . . .
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