Q. Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.

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Q. Inhalation of silica dust causes a disease called

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Q. Solid content in most of the domestic sewage is about __________ percent.

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Q. In troposphere (the weather domain), the temperature 't' at height 'h' above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

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Q. Pick out the wrong statement.

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Q. Which of the following is not an air pollutant ?

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Q. Presence of high concentration of ozone and smog in atmospheric air causes the

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Q. Algae growth in water is controlled by

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Q. __________ is removed from water by lime-soda process.

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Q. Green house effect is accentuated by

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Q. Thermal pollution due to excessive heat & temperature in the working place causes

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Q. High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes

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Q. World environment day is observed every year on the 5th of

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Q. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

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Q. Automobile exhaust is passed through two compartments catalytic converter employing platinum as catalyst for

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Q. Lagooning process is mainly a means of the

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Q. Carbon monoxide is a pollutant, which causes

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Q. Pollution by particulate matter emission in the atmosphere does not take place during metal

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Q. Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as

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Q. The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

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