Q.1
A shallow pond in which the sewage is retained and biologically treated is called
Q.2
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
Q.3
Presence of soluble organics in polluted water causes
Q.4
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
Q.5
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.
Q.6
Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
Q.7
The permissible color for domestic water supply is __________ ppm.
Q.8
Reingleman chart is used for the evaluation of __________ pollution.
Q.9
Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
Q.10
Inhalation of silica dust causes a disease called
Q.11
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
Q.12
Which of the following is a manmade source of air pollution?
Q.13
Main pollutants released from petroleum refineries is
Q.14
Which is the most practical and economical method for removal of suspended solid matter from polluted water?
Q.15
As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)
Q.16
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Q.17
Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the
Q.18
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
Q.19
Noise pollution level in a chemical plant is expressed in
Q.20
White smoke coming out of the chimney of a furnace indicates the use of
Q.21
Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
Q.22
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm.
Q.23
80% less than 200 mesh size particles are called
Q.24
Removal of __________ is accomplished by aeration of water.
Q.25
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.
Q.26
5-200 μm size particles are called
Q.27
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes
Q.28
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
Q.29
Ethanolamine is an absorbant used for the removal of __________ from air/gas.
Q.30
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
0 h : 0 m : 1 s