Maximum permissible residual chlorine in treated water should be ____________ mg/litre?

Related Mcqs:

The term Biological Oxygen Demand (BOD) is used in relation to ______________________?

A. Potable water B. Cooling water C. Distilled water D. Industrial effluents...

Which of the following is the most lethal water pollutant ?

A. Phenol and cyanide B. Chlorine C. Alkalis D. Suspended solids...

Higher concentration of CO2 in atmosphere_____________________?

A. Allows visible solar radiation (ultraviolet) of short wave-length to pass through B. Reflects and absorbs the longer wavelength (infra-red) radiations C. Prevents solar heat being radiated out completely, resulting in ‘heat trap’ i.e., global warming D. All A., B. and C....

Exposure to SO2 containing chimney gases results in the__________________?

A. Reduction in strength of leather & cloth B. Acceleration of corrosion rates of metals C. Increased drying & hardening time of paints D. All A., B. and C....

Thermal pollution due to excessive heat & temperature in the working place causes__________________?

A. Reduction in working efficiency of manpower B. Fatigue C. High breathing rate D. All A., B. & C....