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Civil Engineering Objective Questions { Hydrology }

141.  Turbidity of water may be caused due to
A. Suspended clay
B. Suspended silt
C. finely divided organic material
D. all the above.
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142.  To detect the turbidity of the order of 0 to 1000 P.P.M. the instrument used is
A. turbidimeter
B. Jackson turbidimeter
C. Baylis turbidimeter
D. IIallige turbidimeter.
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143.  The maximum permissible colour for domestic supplies based on cobalt scale, is
A. 5 Ppm
B. 10 ppm
C. 15 ppm
D. 20 ppm
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144.  The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed
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145.  Pick up the correct statement from the following :
A. For determination of small colour intensities, tintometer is generally used
B. The odour of water sample is generally measured by a term called odour intensity
C. The colour of water sample may be detected by Nessler tube
D. All the above.
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146.  Pick up the incorrect statement from the following :
A. The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
B. Higher value of pH means lower hydrogen ion concentration
C. Lower value of pH means higher hydrogen ion contraction
D. Lower value of pH gives alkaline solution
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147.  Pick up the correct statement from the following :
A. The pH value of neutral water is 7
B. The maximum acidity is obtained When pH value is zero
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