How many methods are used for the purification of sewage water?
a) 1
b) 2
c) 4
d) 3
Explanation:Distillation, reverse osmosis, activated carbon, ultraviolet disinfection.
Which of the following filtrations process starts when heating water in a container until it reaches boiling point and the water vapors that rise upward during this process are cooled and condensed from the original container?
a) distillation
b) reverse osmosis
c) ultraviolet disinfection
d) none of these
The process that utilizes a semi permeable membrane called?
a) reverse osmosis
b) distillation
c) activated carbon
d) all of these
Which of the following is an excellent filtrations method for impurities?
a) ultraviolet disinfections
b) activated carbon
c) both a & b
d) all of these
Which of the following filtrations disinfects micro-organisms from water?
a) ultraviolet filtration
b) activated carbon
c) both a & b
d) none of these
The height of cirrus clouds is mostly from……
a) 3 to 5 km
b) 5 to 7 km
c) 7 to 9 km
d) 8 to 12 km
