Drilling of Petroleum:-
Petroleum usually occurs at ………..feet.
a) 300
b) 400
c) 500
d) 600
The ………..is found in porous rock.
a) crude oil
b) natural gas
c) asphalt
d) paints
When the ………..pocked is pierced the gas pressure, forces the oil out.
a) juice
b) paints
c) iron
d) oil
The oil obtained from the mine is conveyed by system of pipelines to the refining for….
a) distillation
b) smelting
c) roasting
d) refining
The art and science of mining a hole in the earth crust or rock is called ………….
a) roasting
b) drilling
c) smelting
d) none of these
