Question16:-ls a technique where a row of parallel holes closely spaced, along the
excavation perimeter or final excavation are fired simultaneously prior to the
primary blast using decoupled charges or low strength and energy explosives

A:-Line drilling

B:-Smooth blasting

C:-Post-splitting

D:-Pre-splitting

Correct Answer:- Option-D
Question17:-The depth of hole is restricted to 50% - 60% of the width of the drift in

A:-Fan cut

B:-Drag cut

C:-Burn cut

D:-Pyramid cut

Correct Answer:- Option-D

Question18:-Which of the following statement is correct with respect to
transportation of explosives?

A:-10 T or half the carrying capacity of railway wagon whichever is less
B:-10 T or half the carrying capacity of a road van whichever is less
C:-10 T or full the carrying capacity of railway wagon whichever is less
D:-10 T or full the carrying capacity of railway van whichever is more
Correct Answer:- Option-A

Question19:-Which of the following statement is 'NOT' correct with respect to
transportation of explosives?

A:-A vehicle transporting explosives shall not be driven at a speed exceeding
25 km/hour

B:-No trailer shall be attached to a vehicle transporting explosives

C:-A vehicle transporting explosives shall be taken into garage or repair shop
in emergencies

D:-A vehicle transporting explosives shall be refueled except in emergencies
and then only when its engine is stopped and other precautions taken to prevent
accidents

Correct Answer:- Option-C

Question20:-The drill machine used for drilling vertical holes of 150 - 300 mm
diameter specially in medium hard rocks is

A:-Churn drill
B:-Jackhammer drill
C:-Diamond drill
D:-Well hole drill

Correct Answer:- Option-A