1. Heavy roof fall even premature collapse may take place if line of goaf is
2. Gallaries which are heightend, widended should be supported by row of props . . . . . . . . meter aparts and chocks . . . . . . . . meter apart.
3. Drilling with manual labour without help of power is suitable upto a depth of
4. The life C.I. pipes used in sand stowing is . . . . . . . . lac ton of sand.
5. Underground water emerging on surface in form of seepages and springs found to form loose superfical deposits of calcium carbonates called
6. Which type of drill bit suitable for highly sillceous rock
7. In B.G the full thickness of the seam can be extracted in one lift with percentage of recovery upto . . . . . . . .
8. Length of holes drilled by jumbos vans from
9. Spiral warm is used for removing
10. The fall which takes place soon after withdrawal of supports called
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