Name the chemicals which are used in refrigerators and air
conditioners and damage ozone layer when released in air.
Which of the following is not a green house gas?
(a) nitrogen gas (b) water vapour (c) methane gas (d) carbon dioxide
Trees help in reducing the pollution of our environment. Lakhs
of trees are planted by people in the month of July every year.
The occasion is called
(a) forest Conservation Day (b) plantation month (c) Van Mahotsav (d) wildlife week
A pond contains clean water. Which of the following activities
will produce least pollution of water?
(a) washing clothes in the pond
(b) animals bathing in the pond
(c) washing motor vehicles in the pond
(d) swimming in the pond.
Which of the following procedures will give you water free from all impurities?
(a) adding chlorine tablets (c) boiling (b) distillation (d) filtration
Potable water is the water which is
(a) obtained from a river. (b) obtained from a lake
(c) pure and fit for drinking. (d) used only for washing clothes.
The phenomenon of marble cancer is due to
(a) soot particles (b) CFCs (c) fog (d) acid rain
Incomplete combustion of fuel such as petrol and diesel gives
(a) nitrogen oxide (b) sulphur dioxide (c) carbon monoxide (d) carbon dioxide
The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is
(a) air pollution (b) water pollution (c) soil pollution (d) noise pollution
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