26,In blasting in shaft sinking the number of holes are....times the dia of the shaft in m?,
2,3,4,1,
27,The quantity of ventilating air(cu.m) shall be provided in siking shaft if depth exceeds 25m?,
100,200,300,400,
28,Upward drivage of shaft is carried out for a distance upto ...m?,
15,25,35,45,
29,A permanant lining where running sand is encountered during sinking is..?,
Cementation,piling,concrete lining,tubbing,
30,The method of sinking through loose deposits of sand upto 20m is ?,
piling system,open caison,tubbing,cementation,
Ans: 2, 3, 1, 4, 1
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