Water used in industries as a coolant or for cleaning dissolve all the chemicals and detergents and cause …………..pollution.
a) air
b) water
c) noise
d) all of these
Radioactive wastes that may leak from…… also create many problems to the living organisms.
a) canals
b) rivers
c) nuclear power station
d) lake
Some……….use water for cooling purposes.
a) industries
b) power station
c) peoples
d) both a & b
Hot water from industries discharges into rivers may destroy aquatic life, if the temperature of that water is higher than……
a) 150C
b) 200C
c) 250C
d) 300C
The sewage water goes into the ………
a) other water sources
b) river
c) both a & b
d) none of these
Sewage water consists of ………….
a) bacteria
b) germs
c) viruses
d) all of these
