61. The voltage of electric cap lamp is . . . . . . . .
62. Copper is better conductor of heat than . . . . . . . .
63. Spontanious heating of coal is mainly found in . . . . . . . .
64. The weight of the Acetylene portable hand lamp is . . . . . . . . kg.
65. The stone dust barrier will fail if it is located within minimum m from face . . . . . . . .
66. The surface which is good reflector of light . . . . . . . .
67. The thickness of glass cylinder used in flame safety lamp shall be . . . . . . . . thick.
68. It is the average candle of power of lamp in all directions in horizontal plane passing through the centre of source, obtained by rotating lamp in vertical axis.
69. The unit of light (luminous flux) emitted by a light source.
70. In a factory in every part where persons are working minimum illumination should be of . . . . . . . . lux.
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