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Photochemical smog was first observed in -
Photochemical smog was first observed in Los Angeles in the 1940s. A photochemical smog is the chemical reaction of sunlight, nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the atmosphere, which leaves airborne particles (called particulate matter) and ground-level ozone
An increase in concentration in the atmosphere will result in
Global warming occurs when carbon dioxide (CO2) and other air pollutants and greenhouse gases collect in the atmosphere and absorb sunlight and solar radiation that have bounced off the earth’s surface.
Domestic waste will lead to -
Biodegradable pollution
The major source of BOD in the river Ganga is
Human waste
The Ganges river basin is one of the most fertile and densely populated regions in the world that covers an area of 1,80,000 . The river flows through 29 cities with population over 100,000; 23 cities with population between 50,000 and 100,000, and about 48 towns.
If a lake is contaminated with DDT, its highest concentration would be found in
If a lake is polluted with pesticides, large fish will contain the maximum amount of pesticide. The process due to which large fish will contain the maximum amount of pesticide is called biological magnification. It is also called as biomagnification. Phytoplanktons and zooplanktons absorb pesticide from the polluted water. Small fishes eats phytoplankton and zooplanktons. There will be increased accumulation of pesticide in their bodies. These small fishes are eaten by big fish. Hence, the big fish will have the maximum amount of pesticide called tertiary consumer.
The most harmful air pollutant produced by automobiles is
Motor vehicle emissions contribute to air pollution and are a major ingredient in the creation of smog in some large cities. Transportation contributes to more than half of the carbon monoxide, sulphur dioxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air. Carbon monoxide (CO) is a colourless, odourless, toxic non-irritating gas. It is a product by incomplete combustion of fuel such as natural gas, coal or wood. Vehicular exhaust is a major source of carbon monoxide.
Sewage water can be purified by
Sewage contains a lot of impurities and complex organics substances that contaminate them. In order to purify this system initially the sewage system is filtered after agglomerating the solid sludge in the system.
After this the water is treated with aerobic organisms and then by anaerobic organisms that break down the complex organic substances that can be broken down into simpler substances.
Major pollutant in Jet plane emission is -
What is B.O.D.
Biochemical oxygen demand (BOD) represents the amount of oxygen consumed by bacteria and other microorganisms while they decompose organic matter under aerobic (oxygen is present) conditions at a specified temperature. When you look at water in a lake the one thing you don't see is oxygen.
What is the intensity of sound in normal conversation
2.
Greater Than TOH |
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