Environmental Engineering Questions

• There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
• Fresh domestic sewage is __________ in color.
• Which of the following is a secondary air pollutant?
• Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
• In sewage treatment, its sedimentation is speeded up by commonly adding
• Presence of __________ bacteria in water causes disease like typhoid.
• Which of the following is a manmade source of air pollution?
• TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes
• Which of the following sources is responsible for maximum air pollution?
• Which of the following is not a practical method of low level radioactive waste disposal?
• Beyond what concentration of H2S in air, acute danger to human life exists?
• Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
• CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.
• Insufficient washing of sand grains in a rapid sand filter causes
• Out of the following, TLV of __________ is maximum (about 500 ppm).
• Reingleman chart is used for the evaluation of __________ pollution.
• A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
• Carcinogenic air pollutants cause
• Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
• Noise level in a quiet private business office is about __________ decibels.