When two solutions of the different concentration are separated by the semi permeable membrane then the solvent flows from low to higher concentration is called osmosis.
a) True
b) False
Q.2.
Which of the following method is not the method of desalination?
a) Reverse osmosis
b) Multi flash distillation
c) Electro dialysis
d) Smelting
Q.3.
The natural tendency of the water can be reversed by applying ________ to the salty water part.
a) Low pressure
b) High pressure
c) Low temperature
d) High temperature
Q.4.
In reverse osmosis, the water flows from __________ concentration to ___________ concentration.
a) Low, high
b) High, low
c) High, moderate
d) Moderate, low
Q.5.
The semi permeable membranes used in the reverse osmosis is _________
a) Cellulose
b) Glucose
c) Cellulose acetate
d) Glucose acetate
Q.6.
By ultra filtration aldrin can be removed by _________
a) 100%
b) 99%
c) 98%
d) 97%
Q.7.
__________ co polymer can remove the chlorinated pesticides.
a) Styrene di vinyl benzene
b) Styrene
c) Benzoyl peroxide
d) Phenol
Q.8.
In reverse osmosis, the membrane pores are smaller in size about ___________
a) 0.04 to 600nm
b) 0.08 to 500nm
c) 0.1 to 600nm
d) 0.2 to 500nm
Q.9.
COD values are always _________ BOD.
a) Less than
b) Higher than
c) Equal
d) Nearly equal
Q.10.
COD can be determined in ___________
a) 1 Hour
b) 2 Hours
c) 3 Hours
d) 4 Hours
Q.11.
Increase in the BOD value in the water indicates ___________
a) Decrease in pollution
b) Increase in pollution
c) Pollution is independent of BOD
d) Slight decrease in the BOD
Q.12.
The organic matter have the limit in water that is about __________
a) 0.2 to 1
b) 0.5 to 1
c) 1 to 2
d) 2 to 4
Q.13.
In sewage the waste is about ___________
a) 0.01
b) 0.02
c) 0.03
d) 0.05
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