Infective bacteria in water is killed by the __________ process. Aeration None of these Disinfection Sterilisation TRUE ANSWER : ? YOUR ANSWER : ?
CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones. 10¹⁵ 10⁹ 10⁵ 10² TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most lethal water pollutant? Phenol and cynide Chlorine Suspended solids Alkalis TRUE ANSWER : ? YOUR ANSWER : ?
Nitrogen oxides (NOx) is not produced in the __________ industry. Nitrogenous fertiliser Detergent Any of these Nitric acid making TRUE ANSWER : ? YOUR ANSWER : ?
Dose of chlorine for disinfection of water is about __________ mg/litre of water. 1 0.3 0.01 0.1 TRUE ANSWER : ? YOUR ANSWER : ?
In water chemical treatment plant, use of chloramines ensures Taste & odour control Weed control in reservoirs Disinfection Removal of permanent hardness TRUE ANSWER : ? YOUR ANSWER : ?
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre. 42 2 1050 332 TRUE ANSWER : ? YOUR ANSWER : ?
The upper layer of atmosphere is called the Stratosphere Ionosphere Troposphere None of these TRUE ANSWER : ? YOUR ANSWER : ?
Reingleman chart is used for the evaluation of __________ pollution. Radioactive Water Air Noise TRUE ANSWER : ? YOUR ANSWER : ?
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 Chlorine or its compounds Ultraviolet light for irradiation of water All of these Ozone and iodine TRUE ANSWER : ? YOUR ANSWER : ?