World environment day is observed every year on the 5th of September June July December TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most widely used disinfectant in water treatment? Cation exchanger Chlorine Coagulation Irradiation of water by ultraviolet light TRUE ANSWER : ? YOUR ANSWER : ?
The biological decomposition of organic substances in wastes controlled conditions is called Incineration Composting None of these Biological oxidation TRUE ANSWER : ? YOUR ANSWER : ?
The main industrial source of emission of hydrogen sulphide air pollutant is Pulp and paper plant Coal based thermal power plants Petroleum refineries Metallurgical roasting & smelting plant TRUE ANSWER : ? YOUR ANSWER : ?
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm. 50 1 5 500 TRUE ANSWER : ? YOUR ANSWER : ?
Reingleman chart is used for the evaluation of __________ pollution. Air Radioactive Water Noise TRUE ANSWER : ? YOUR ANSWER : ?
Water effluent generated in printing industry is decolourised by Reverse osmosis Ion exchange technique Electrolytic decomposition Adsorption TRUE ANSWER : ? YOUR ANSWER : ?
Algae growth in water is controlled by Bleaching Aeration Chlorination Deoxidation TRUE ANSWER : ? YOUR ANSWER : ?
__________ substances present in sewage are removed in grit chamber during sewage treatment. Dissolved Inorganic Fatty Organic 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. 10⁹ 10¹⁵ 10² 10⁵ TRUE ANSWER : ? YOUR ANSWER : ?