CBSE Questions for Class 8 Chemistry Pollution Of Air And Water Quiz 3 - MCQExams.com

The sources of air pollutants are:
  • factories
  • power plants
  • automobile exhaust
  • All of the above
A pond contains clean water. Which of the following activities will produce least pollution of water?
  • Washing clothes in the pond
  • Animals bathing in the pond
  • Washing motor vehicles in the pond
  • Swimming in the pond
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in July every year. The occasion is called ______________.
  • Forest Conservation Day
  • Plantation month
  • Van Mahotsav
  • Wildlife week
The phenomenon of marble cancer is due to:
  • global warming
  • CFCs
  • fog
  • acid rain
Boojho wishes to contribute to reducing air pollution. Which vehicle should be used for going to school?
  • Car
  • School bus
  • Auto rickshaw
  • Scooter
Incomplete combustion of fuel such as petrol and diesel gives:
  • nitrogen oxide
  • sulphur dioxide
  • carbon monoxide
  • carbon dioxide
Potable water is the water which is
  • obtained from a river.
  • obtained from a lake.
  • pure and fit for drinking.
  • used only for washing clothes.
Which one of the following is a  man-made source of air pollution?
  • Volcanic-eruption
  • Automobile-exhaust
  • Both A and B
  • None of these
Water is often treated with chlorine to ________.
  • increase oxygen content
  • kill germs
  • remove suspended particles
  • remove hardness
  Which among the following is a major cause of water pollution?
  • Fly ash
  • Aeroplane
  • Automobile exhaust
  • Pesticides
Greenhouse effect keeps the earth surface:
  • cold at night
  • dusty and cold
  • warm at night
  • none of these
Air has________ composition with________ oxygen at high attitudes.
  • fixed, less
  • variable, less
  • variable, more
  • fixed, more
Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of __________.
  • carbon monoxide and water vapour
  • carbon monoxide
  • nitrogen dioxide
  • sulphur dioxide
Which of the following is one of the major factors that cause water pollution?
  • Burning of fossil fuels.
  • Dumping of industrial waste.
  • Use of CFC's.
  • None of these
If water pollution continues at its present rate, it will eventually:
  • stop water cycle
  • prevent precipitation
  • make oxygen molecules unavailable to water plants
  • make nitrate molecules unavailable to water plants
Which of the following is the main factor of water pollution?
  • Smoke
  • Industrial waste
  • Detergents
  • Ammonia
We feel fresh while on a morning walk in natural surroundings. Why don't we feel the same after 10 a.m and during rush hours?
  • Partial burning of carbon by traffic which produced carbon monoxide.
  • Inhaling polluted air makes us feel tired.
  • More pollution produced during the day due to moving vehicles and industrial activities.
  • All of the above.
Air is said to be a mixture because air at different places contains different amounts of various gases.
  • True
  • False
Which of the following options is a major water pollutant nowadays?
  • Industrial effluents and waste
  • Agricultural waste
  • Domestic waste
  • None of the above
Greenhouse effect is mainly caused by :
  • $$NO_2$$
  • $$CO$$
  • $$NO$$
  • $$CO_2$$

Above figure represents the phenomenon of:

210080_ad41641419f846918b698cfa98083747.png
  • Acid rain
  • Greenhouse effect
  • Ozone depletion
  • None of these
An increase in $${ CO }_{ 2 }$$ concentration in the atmosphere will result in:
  • acid rain
  • global warming
  • genetic disorders in plants and animals
  • no effect on earth's climate
The correct ascending order of gases as per their composition in air is:
  • oxygen < carbon dioxide < nitrogen
  • hydrogen < oxygen < nitrogen
  • nitrogen < hydrogen < oxygen
  • oxygen < carbon dioxide < hydrogen
Carbon particles and smoke from factories:
  • increase the rate of respiration in plants.
  • decrease the rate of photosynthesis in plants.
  • increase the absorption of carbon dioxide by plants.
  • decrease the rate of transpiration in plants.
The pie chart shows the composition of air. Identify the gases W, X, Y.

276906.png
  • Nitrogen - Rare gases - Oxygen
  • Carbon - Oxygen - Rare gases
  • Nitrogen - Oxygen - Rare gases
  • Rare gases - Hydrogen - Oxygen
The gas associated with the greenhouse effect is:
  • carbon dioxide
  • oxygen
  • nitrogen dioxide
  • sulphur dioxide
Which of the following does not cause any kind of pollution?
  • Establishing forest reserves
  • Using pesticides in farms
  • Developing housing estates
  • All of these cause pollution
Which of the following is not a direct cause of air pollution?
  • Thinning of the ozone layer
  • Increase in the number of diabetic patients
  • Destruction of habitats
  • Global warming
The gases released from vehicle exhausts are:
I. Carbon monoxide
II. Sulphur dioxide
III. Oxides of nitrogen
  • I and II only
  • I and III only
  • II and III only
  • I, II and III
The earth reflects .......... energy into atmosphere.
  • light
  • heat
  • hydro
  • wind
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