Which of the following support has maximum linear progress?
A. Timber prop
B. Square chock
C. Roof bolt
D. Friction prop
Answer: Option C
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It is very difficult to control shaley roof if coal is not left with the shale why?
A. It is weak in nature
B. It has weathering effect
C. It has great affinity to absorb moisture and get departed from immediate roof
D. It reacts with coaly surface
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