11. Massive roof consists mostly
12. In safari support the minimum number of laggings to be given is decided as
13. Which roof is reliable
14. For a given perimeter the greatest area of support is offered by
15. The lid and wedges should be atleast of same width as . . . . . . . . of prop.
16. Roof falls or floor heaving occurs predominently in the areas where the average extraction ratio is
17. The length of lid is . . . . . . . . placed over the-prop.
18. 'Phons' is a unit of
19. The weight of the rocks in coal mining areas exerts a pressure of nearly . . . . . . . . for every meter depth.
20. The first mining institution [degree in mining] IITBHU Varanasi, was erected in the year
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