51. The strength of rock in pure stress within any aixal pressure termed as
52. Shield support has been employed in working a seam in one lift upto thickness of
53. The mining, geological and metallogical institute in India was established in the year
54. Increase of carbon in Iron make it
55. The diameter of bolt in slot and wedge types
56. Which type of prop can be easily withdrawn
57. To find and acquire a maximum number of non economic mineral deposits with a minimum cost is called
58. Stull support in metal mines is same as
59. Friction prop is . . . . . . . . type of support.
60. Unit of peak particle, velocity (PPV) is
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