………….can burn skin.
a) synthetic fertilizer
b) Natural fertilizer
c) both a & b
d) none of these
Natural fertilizer change soil fertility by increasing its…………….
a) acidity
b) basicity
c) both a & b
d) none of these
Petroleum Industry:-
Many useful materials on which modern life depends are produced by the petrochemical industry such as …………….
a) solvents
b) lubricants
c) detergents
d) all of these
Crude oil cannot be used directly but must be……………before use.
a) refined
b) boil
c) melt
d) freeze
The petroleum is …………..
a) crude oil
b) milk
c) juice
d) wine
