Tolerable limit of nitrogen oxides in air is _____________ ppm?
Tolerable limit of nitrogen oxides in air is _____________ ppm?
A. 0.1
B. 1
C. 5
D. 25
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The main industrial source of emission of hydrogen sulphide air pollutant is________________?
The main industrial source of emission of hydrogen sulphide air pollutant is________________?A. Petroleum refineries
B. Coal based thermal power plants
C. Pulp and paper plant
D. Metallurgical roasting & smelting plantHigh concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?
High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes____________________?A. Cancer
B. Silicosis
C. Respiratory disease (e.g., asthma)
D. Reduced crop yieldPresence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?A. Acts as a green house gas thereby raising earth’s temperature
B. Causes asphyxia
C. Causes increase in sea level
D. Enhances the green house effectThe lowest layer of atmosphere is known as the_____________________?
The lowest layer of atmosphere is known as the_____________________?A. Stratosphere
B. Troposphere
C. Ionosphere
D. None of theseRingelmann chart No. 2 corresponds to _______________ percent black smoke?
Ringelmann chart No. 2 corresponds to _______________ percent black smoke?A. 10
B. 20
C. 40
D. 80Methyl isocyanate (MIC) gas (TLV
Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?A. Moderately
B. Highly
C. Extremely
D. Very extremely