Engineering :: Environmental Engineering

91.  Odours are generally expressed in terms of
A. Hardness number B. Gravity number
C. Index number D. Threshold number
E. None of the above    

92.  Which of the following turbidimeter gives direct readings in ppm
A. Jackson turbidimeter B. Hellige turbidimeter
C. Baylis turbidimeter D. All of the above
E. None of the above    

93.  To keep the water safe against pathogenetic bacteria the residual chlorine should remain between
A. 0.05 to 0.2 ppm B. 0.2 to 0.8 ppm
C. 1 ppm to 2 ppm D. 6 ppm to 10 ppm
E. 10 ppm to 20 ppm    

94.  Brackish taste of water is due to
A. Chlorides of sodium B. Fluorides of sodium
C. Turbidity D. Dead bacteria
E. Any of the above    

95.  The hardness of soft water (in ppm) is
A. 0 - 50 B. 50 - 150
C. 200 - 350 D. 375 - 500
E. 500 - 1000    

96.  The process of passing the water through a thick layer of filtering media is known as
A. Sedimentation B. Filtration
C. Disinfection D. Purification
E. Putrification    

97.  The process of killing the ineffective bacteria from the water and making it safe for use is known as
A. Disinfection B. Sterilization
C. Filtration D. Purification
E. None of the above    

98.  Which of the following is an insect born disease?
A. Q-fever B. Ring worm
C. Jaundice D. Tetanus

99.  The bactericidal, virucidal and cysticidal efficiency of chlorine as a disinfectant
A. increases with a decrease in pH B. increases with a increase in pH
C. decreases with a decrease in pH D. decreases with an increase in pH

100.  All of the following are pesticides EXCEPT:
A. Aldrin B. Endrin
C. Chloroform D. BHC

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