Standard EDTA (ethylene diamine tetra acetic aciD. solution is used to determine the_______________?
A. Hardness in water
B. Turbidity in water
C. Dissolved oxygen in water
D. Residual chlorine in water
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Which of the following values of pH represents a stronger acid?
A. 2
B. 5
C. 7
D. 10
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On standard silica scale, the turbidity in drinking water should be limited to_______________?
A. 10 ppm
B. 20 ppm
C. 30 ppm
D. 50 ppm
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Orthotolidine test is used for determination of________________?
A. Dissolved oxygen
B. Residual chlorine
C. Biochemical oxygen demand
D. Dose of coagulant
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The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about______________?
A. 0.01 to 0.05 ppm
B. 0.05 to 0.5 ppm
C. 0.5 to 1.0 ppm
D. 1.0 to 5.0 ppm
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The velocity of flow of water in a sedimentation tank is about__________________?
A. 5 to 10 cm/sec.
B. 15 to 30 cm/sec.
C. 15 to 30 cm/minute
D. 15 to 30 cm/hour
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The settling velocity of a particle in a sedimentation tank increases if_________________?
A. Particle size is decreased
B. The surface area of tank is increased
C. The depth of tank is decreased
D. None of the above
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The overflow rate for plain sedimentation tanks is about__________________?
A. 500 to 750 litres/hour/ m2
B. 1000 to 1250 litres/hour/ m2
C. 1250 to 1500 litres/hour/m2
D. 1500 to 2000 litres/hour/m2
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The settling velocity of a particle in a sedimentation tank depends on__________________?
A. Depth of tank
B. Surface area of tank
C. Both depth and surface area of tank
D. None of the above
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For a given discharge, the efficiency of sedimentation tank can be increased by______________?
A. Increasing the depth of tank
B. Decreasing the depth of tank
C. Increasing the surface area of tank
D. Decreasing the surface area of tank
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Word of the Day
23 Sep
Detention
the action of detaining someone or the state of being detained in official custody.
حراست، قید کرنا

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