Explanation: Polythene bags, synthetic fiber, and paper are non-biodegradable wastes whereas food waste is biodegradable waste.

Explanation: Disinfection is a process which is done to kill microorganism present in the water after the filtration process.

Explanation: Cultural eutrophication is a water pollution due to the presence of excessive nutrients from house waste, industries, etc. that pollutes the lake, decreases the oxygen level and destroys the aquatic ecosystem.

Explanation: In the lower layers of atmosphere, light of wavelengths greater than 300nm are present and it is because of this reason, there is generally no ozone formation at the ground level.

Explanation: Greenhouse gases trap the infrared radiations from the sun and reflect it back to the Earth’s surface thereby heating up the planet.

Explanation: Electrostatic precipitator has the maximum efficiency among the rest with a value of 99%.

Explanation: Photochemical smog includes NO2, O3 and PAN. The damage to vegetation is caused by NO2, O3 and PAN.

Explanation: Flushing tank is used to flush and clean the sewer to prevent it from clogging. This is done either by automatic flushing tank or by hand operated flushing tank.

Explanation: There are four factors that affect the dry weather flow, namely the rate of water supply, population growth, type of area served and infiltration of ground water.

Explanation: NO is a highly reactive gas which is reddish brown in color, whereas O3, Pb and SO3 are colorless gas.

Explanation: The sewage in the separate water carriage system will be of more uniform character and it will lend itself more easily to purification.

Explanation: Dry weather flow is the quantity of wastewater that flows through a sewer in dry weather when no storm water is present in the sewer.

Explanation: Methane is a gas released by the digestive processes of cattle and hence cattle farming also contributes to the greenhouse effect.