Engineering :: Environmental Engineering

81.  Which of the following constituent of air has the least percentage?
A. Argon B. Carbon dioxide
C. Xenon D. Neon
E. Helium    

82.  Which of the following is the major source of environmental pollution in urban areas?
A. Rolling mills B. Power plants
C. Automobiles D. Floor mills
E. Electronic industries    

83.  Which of the following industry is least polluting?
A. Cement industry B. Oil refinery
C. Thermal power plants D. Electronic industry
E. Rolling mills    

84.  Which of the following is the major source of pollutant hydrogen sulphide?
A. Decaying organic matter B. Auto exhaust
C. Oil burners D. Solar energy
E. None of the above    

85.  Which of the following is the major source of flyash emission?
A. Sintering plants B. Oil refineries
C. Blast furnace D. Power plants
E. Sulphuric acid plant    

86.  Which of the following is unlikely to be the pollutant from a sulphuric acid plant?
A. Sulphur dioxide B. Sulphur trioxide
C. Acid mist D. Hydrogen sulphide
E. All of the above    

87.  In power plant an electrostatic precipitators is installed between
A. Forced draft fan and furnace B. Furnace and chimney
C. Primary air and secondary air D. Induced draft fan and forced draft fan
E. Air preheater and water treatment plant    

88.  The colour of water is measured
A. In ferms of pH value B. In terms of degree of hardness
C. In terms of platinum cobalt scale D. ppm of dissolved solids
E. None of the above    

89.  Out of the following metals the least permissible percentage in drinking water is
A. Chromium B. Copper
C. Zinc D. Lead

90.  Turbidity of water is usually measured in terms of
A. Sodium scale B. Silica scale
C. Cobalt scale D. Platinum scale
E. Calcium scale    

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