Brewery and sugar factory waste alters the quality of a water body by increasing

What is the new auto fuel policy?

Given below are two statements:
Statement $I$: Electrostatic precipitator is most widely used in thermal power plants.
Statement $II$: Electrostatic precipitator in thermal power plants removes ionising radiations.
In the light of the above statements,choose the most appropriate answer from the options given below:

The measurement of the amount of organic matter in water is known as:

If the concentration of $DDT$ in water is $0.003\, ppm$,what could be its concentration in small fish due to biomagnification (in $, ppm$)?

The most hazardous metal pollutant used in automobiles is .....