51. Personal dust samples are suitable for
52. Methalaram works on the principle of . . . . . . . .
53. In Trigger barrier . . . . . . . . is used.
54. The life of the bulb of old ham battery is . . . . . . . . hours.
55. Hook warm disease also called . . . . . . . .
56. The minimum average standards of lighting in haulage engines and control gear rooms in lumens/sq.ft.
57. Reducing the sound power by half would lead to decrease in the dB value by
58. The fuel used in GL-5 lamp is . . . . . . . .
59. The reason behind chasnala inundation.
60. Permissable limit of respirable concentration of dust should be checked on the basis of . . . . . . . .
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