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
Orthotolidine test is used for determination of________________?
(A) dissolved oxygen
(B) residual chlorine
(C) biochemical oxygen demand
(D) dose of coagulant
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
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
The devices which are installed for drawing water from the sources are called______________?
(A) aquifers
(B) aquiclude
(C) filters
(D) intakes
Assertion A : The consumption of water increases with increase in the distribution pressure. Reason R : Higher distribution pressure causes more loss and waste of water. Select your answer according to the coding system given below?
(A) Both A and R are true and R is the correct explanation of A
(B) Both A and R are true but R is not the correct explanation of A
(C) A is true but R is false
(D) A is false but R is true
Which of the following causes a decrease in per capita consumption ?
(A) use of metering system
(B) good quality of water
(C) better standard of living of the people
(D) hotter climate
If the average daily consumption of a city is 100,000 m3, the maximum daily con¬sumption on peak hourly demand will be_______________?
(A) 100000m3
(B) 150000m3
(C) 180000m3
(D) 270000 m3
As compared to geometrical increase method of forecasting population, arithmetical increase method gives________________?
(A) lesser value
(B) higher value
(C) same value
(D) accurate value