Fill in the blanks :
(i) Rubber particles and dust raised by running motor vehicles are examples of ............... pollutants.
(ii) Too frequent exposure to ......................... in a medical diagnostic technique may damage chromosomes.
(iii) Thermal power plants give out a lot of ...................... waste water.
(iv) Sewage is a liquid waste from ........................... .
Which one of the following is an example of pollutant ?
(a) A rat entering your kitchen.
(b) CO2 given out by the respiring organisms.
(c) The heat given out while cooking food.
(d) The dust raised during road-cleaning
Name the various air pollutants discharged by motor vehicle exhausts.