Related Questions

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
A Bio-Chemical Oxygen Demand (B.O.D.)
B Dissolved Oxygen (D.O.)
C Chemical Oxygen Demand (C.O.D.)
D None of these
Moisture contained by a substance in excess of the equilibrium moisture is called the __________ moisture.
A Unbound
B Free
C Critical
D Bound
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.
A Free
B Unbound
C Equilibrium
D Bound
Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
A Coagulation and flocculation of colloids
B Oxidation of carbonaceous matter to CO2
C Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate
D All of the above
Aerobic biological oxidation ponds used for the purification of polluted water
A Destroys/removes pathogen from the sewage
B Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
C Destroys/removes pathogen much more effectively if the sewage is chlorinated
D All of the above
The artificial activity which indicates that an activity following it, cannot be started unless the preceding activity is complete, is known as
A Event
B Free float
C Dummy
D Constraint
The artificial activity, which indicates that an activity following it cannot be started unless, the preceding activity is complete, is known as
A Event
B Free float
C Artificial
D Dummy
Aerobic activity is maximum
A In freshly produced sewage
B At sewer pipes
C In sewer treatment plants
D None of these
The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
All moisture in a non-hygroscopic material is the __________ moisture.
A Free
B Equilibrium
C Unbound
D Bound

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