EXAMIANS
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
YOUR ANSWER : ?
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Sulphur dioxide present in the industrial chimney exhaust gases causes
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H₂S present in gaseous stream can be removed by adsorption on
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Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
YOUR ANSWER : ?
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
YOUR ANSWER : ?
Fine grit present in sewage is removed in the __________ during sewage treatment.
YOUR ANSWER : ?
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
YOUR ANSWER : ?
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
YOUR ANSWER : ?
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
YOUR ANSWER : ?
Thermal pollution due to excessive heat & temperature in the working place causes
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