Prolonged liberal irrigation of agricultural fields is likely to create the problem of

Which of the following problems is created by a brief exposure to an extremely high sound level,$150 \, dB$ or more,generated by the takeoff of a jet plane or rocket?

The pesticide used to kill aquatic pests (including insects) is:

Which of the following is a secondary pollutant?

Euro-$III$ norms stipulate that sulphur be controlled at ....... $PPM$ in diesel and $PPM$ in petrol.

What is the full form of $CPCB$?