51. Luminous efficiency of flurescent bulb is . . . . . . . .
52. The mesh of wire gauze is . . . . . . . .
53. The quantity of dust contained in it is stated by . . . . . . . . ways.
54. Miner suffering from nystagmus cannot see the . . . . . . . . of in flame safety lamp.
55. Working life of alkaline battery is . . . . . . . . years.
56. The diseases which comes from coal dust breathing.
57. An SPL of 92 dBA was measured 15 m away from source. If the distance was 60 m; the sound measured would be
58. Rescue team consists of . . . . . . . .
59. Common type of dust used for stone dusting in mines.
60. In very dusty mines the dust content . . . . . . . . as per Russian Text Book.
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