Q.1
What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?
Q.2
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.
Q.3
Main pollutants released from iron & steel industry is
Q.4
Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
Q.5
COD of raw municipal sewage may be in the range of about __________ mg/litre.
Q.6
Which of the following is the most lethal water pollutant?
Q.7
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
Q.8
Noise level in a quiet private business office is about __________ decibels.
Q.9
Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
Q.10
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
Q.11
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by
Q.12
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.
Q.13
The principal gas evolved from sludge digestion tank is
Q.14
Pick out the wrong statement pertaining to 'green house' for the plants.
Q.15
BOD of raw municipal sewage may be in the range of about __________ mg/litre.
Q.16
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
Q.17
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
Q.18
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
Q.19
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
Q.20
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
Q.21
Insufficient washing of sand grains in a rapid sand filter causes
Q.22
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
Q.23
Nitrogen oxides (NOx) is not produced in the __________ industry.
Q.24
Which of the following pollutants, if present in atmosphere is detectable by its odour?
Q.25
Polluted water having low BOD are most economically treated in
Q.26
Color test of water is done with an instrument called
Q.27
Presence of __________ in water stream are deleterious to aquatic life.
Q.28
Presence of __________ hardness is responsible for the temporary hardness in water.
Q.29
Radioactive solid nuclear wastes are disposed off by
Q.30
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
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