Q174
Once the coal dust explosion starts, its propagation needs very small quantity of dust, only 1 gram per c.c of space which is equal to thickness of a layer of ordinary thick paper over a periphery of . . . . . . . .m road way.
A.
1.5 m × 1.5 m
B.
2.4 m × 2.7 m
AnswerC.
2.9 m × 3 m
D.
2.9 m × 3.2 m
Answer: Option B
Solution
Answer: Option B
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