Environmental Engineering Questions

• Pick out the wrong statement.
• Removal of __________ is accomplished by aeration of water.
• Which of the following is not an air pollutant?
• Carbon monoxide is a pollutant, which causes
• 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.)
• __________ is removed from water by lime-soda process.
• When the concentration of SO2 in air is greater than __________ ppm, it gives a pungent smell.
• In water treatment, alum[Al2(SO4)3] is used for the process of
• Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
• Death may occur, when SO2 concentration in atmospheric air exceeds __________ ppm.
• Pick out the one which is not a chemical coagulant.
• Main pollutants released from petroleum refineries is
• Thermal pollution due to excessive heat & temperature in the working place causes
• Green house effect is accentuated by
• Radioactive substances present in the polluted water stream can be removed by
• The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is
• High noise level in a chemical plant can be controlled by the
• Higher concentration of CO2 in atmosphere
• Direct reaction of unsaturated hydrocarbons with either NO or NO2 produces an eye irritating pollutant compound known as
• The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.