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80% less than 200 mesh size particles are called
There are thirteen metals which are treated aspollutants.
Which of the following metals is not a pollutant
Hydrogen ion concentration in distilled water is
7 x 10-7
7 x 107
Turbidity of water is an indication of the presence of
suspended inorganic matter
In large thermal power stations very fine particulates present in flue gas are removed by
Carbonaceous particles having size less than 1 μm are called
TLV of NO2 & NO exposure for the human being is 5 & 25 ppmrespectively.
Prolonged exposure of human being to NO2 causes
Presence of __________ bacteria in water causes disease like typhoid
5-200 μm size particles are called
colloids or aerosols
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters
Aerosols present in atmospheric air may be
combination of all (a), (b) & (c).
Persons working in cement plants and limestone quarries are more prone to disease like
flourosis (bone disease)
Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to humanbeings.
Ozone layer depletion in the atmosphere is mainly caused by the presence of
CFC (chloro fluoro carbon)
Exposure to small amount of __________ results in high blood pressure & heart disease in human beings
Iron & manganese present as pollutant in water can not be removed by
lime soda process or manganese zeolite process.
oxidation followed by settling & filtration.
ion exchange process.
Ethanolamine is an absorbant used for the removal of __________ from air/gas
both (b) & (c)
Exposure to SO2 containing chimney gases results in the
increased drying & hardening time of paints.
reduction in strength of leather & cloth.
all (a), (b)and(c).
acceleration of corrosion rates of metals.
TLV of aldrin in public water supply system is about __________ μg/litre
The maximum CO2 is emitted into the atmosphere by
Presence of nitrates in water in excess of 50 ppm causes
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm
1000 to 2000
3000 to 6000
6000 to 9000
10000 to 100000
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filteringmaterial.
The pressure drop in a bag filter is
both (b) and (c).
proportional to the viscosity & density of the gas.
inversely proportional to viscosity of gas.
proportional to the pressure of the gas.
Methyl iso-cynate (MIC) gas (TLV
The widest explosive limit is of __________ , thereby making it the most explosive gas
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres
__________ substances present in sewage are removed in grit chamber during sewage treatment
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
acts as a green house gas thereby raising earth's temperature.
inhances the green house effect.
causes increase in sea level.