A. 1 to 1.5
B. 6.5 to 8
C. 13 to 14
D. 4 to 5
Related Mcqs:
- TLV of mercury in potable (drinking) water is about ______________ ppm?
A. 0.001
B. 0.1
C. 1
D. 5 - Presence of a certain minimum quantity of fluorine is desirable in potable water to prevent___________________?
A. Dental cavities
B. Scale formation
C. Water-borne disease
D. Corrosion - Maximum permissible turbidity in potable water is _____________ ppm?
A. 1
B. 10
C. 250
D. 1000 - Presence of bacteria in potable (drinking) water causes_________________?
A. Turbidity
B. Disease
C. Bad odour
D. Bad taste & colour - Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
A. Ozone and iodine
B. Chlorine or its compounds
C. Ultraviolet light for irradiation of water
D. All A., B. & C. - The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
A. Chlorine
B. Alkalis
C. Benzene hexachloride
D. Alkyl benzene sulphonate (ABS) - In water treatment plant, zeolite process is used to remove the _____________ of water?
A. Acidity
B. Alkalinity
C. Hardness
D. Iron & zinc - Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of _____________ present in it?
A. Coal ash
B. Potassium cyanide
C. Ortho-xylene
D. None of these - The amount of chemical coagulant added for treatment of polluted water ______________ with increase in temperature of the polluted water to be treated?
A. Decreases
B. Increases
C. Remain constant
D. May increase or decrease; depends on the chemical characteristics of polluted water - Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in___________________?
A. Food industry
B. Municipal sewage treatment
C. Petroleum refinery
D. Iron & steel plant
