Fill in the blanks with the help of words given in bracket after
(a) When air is contaminated by ________ substances which have
a ________ effect on both the ________ and ________, it is referred
to as ________.
(air pollution, harmful, living, unwanted, non-living,
(b) Many ________ are responsible for causing ________ pollution.
Petroleum ________ are a major source of ________ pollutants
like ________ and ________.
(sulphur dioxide, refineries, industries, nitrogen dioxide,
gaseous, liquid, people, air).
(c) While ________ your teeth, leaving the ________ running may
waste several ________ of water.
(tap, litres, brushing, washing, drops)
(d) Water which is suitable for _________ is called ________ water.
(washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ________
and ________ impurities.
(insects, microorganism, particles, dissolved, harmful)
NCERT Class VIII
Science - Exemplar Problems
Chapter 18. Pollution of Air and Water