Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
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Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
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Smog is not formed due to the presence of __________ in the atmosphere.
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Dose of chlorine for disinfection of water is about __________ mg/litre of water.
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Which of the following plants does not emit appreciable amount of SO2 in atmosphere?
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Presence of iron and manganese in water causes
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What is the major constituents of waste/polluted water discharged from textile, pulp & paper, tanning, distillary, dairy and meat packing industries?
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Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (> 50 ppm)
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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.
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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
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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.
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Exposure to chemicals having carcinogenic properties cause
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Exposure to chemicals having carcinogenic properties cause
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Beyond what concentration of H2S in air, acute danger to human life exists?
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The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
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Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
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Main pollutants released from iron & steel industry is
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The principal gas evolved from sludge digestion tank is
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Pick out the wrong statement pertaining to 'green house' for the plants.
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Insufficient washing of sand grains in a rapid sand filter causes
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