Environmental Engineering Questions

• Pick out the wrong statement pertaining to 'green house' for the plants.
• TLV of aldrin in public water supply system is about __________ μg/litre.
• Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
• Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
• Lagooning process is mainly a means of the
• Algae growth in water is controlled by
• Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
• __________ substances present in sewage are removed in grit chamber during sewage treatment.
• Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in
• Which of the following acts as a natural source of air pollution?
• Permissible safe limit (TLV) of __________ toxic gas is 100-1000 parts per million (ppm).
• Which of the following is the most major constituents of air pollutants?
• Presence of high concentration of ozone and smog in atmospheric air causes the
• Carbonaceous particles having size less than 1 μm are called
• High concentration of carcinogenic hydrocarbon pollutants in atmospheric air causes
• In the context of the chemical process industries, the term BOD is normally associated with the
• Presence of iron and manganese in water causes
• Most of the bacteria in sewage are
• Solid content in most of the domestic sewage is about __________ percent.
• Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.