Which of the following does not cause air pollution?
Carbon monoxide emitted from exhaust pipes of vehicles.
Pesticides washed into rivers by the rain.
Fogs caused by forest fires.
Smoke from factories.
The ozone layers forms a shield over the Earth's atmosphere to block
Light rays
Heat rays
X-rays
UV rays
The table shows the number of vehicles passing by on an 'X' road at different times of the day.It is most likely that the air was most polluted during the time
Electric wires are usually made of
Aluminium
Magnesium
Copper
Silver
Greenhouse effect is due to presence of
Ozone layer in the atmosphere.
Infra-red light reaching the earth
Moisture layer in the atmosphere
CO2 layer in the atmosphere
A, B, C, D and E are five busy cities in a country. Graph 1 shows the pollution of people in each of the cities. Graph 2 shows the level of air pollution in each city. Study both graphs and answer the following question.
Which one of the following can be concluded from the graphs shown?
The bigger the population of people living in a city, the higher the level of air pollution in that city.
The land is more polluted in city A than in city C.
City E contains the most pollutants in the air.
The air pollution in cities A and D are caused by burning forests.
In an area 'X', there is a factory that burn fuels for energy and causes air pollution. The smoke that it produces contain dust, soot and other harmful gases.
Which of the following is the best solution?
Factories should be built in areas where few people live.
People who live near factories must be prepared to breathe in polluted air.
Lot of trees should be planted near factories to absorb hamrful gases.
Factories should have large chimneys and special device to remove pollutants from smoke.
Which of the following activities is not a method to improve the environment?
Disposing of waste properly.
Reducing the use of fuels.
Producing less rubbish.
Using CFC products.
Study the given statements.
I. Obtaining wood to make paper.
II. Poisoning of the soil by weed killers.
III. Making land available for growing crops.
IV. Digging for fuels and minerals from ground.
Which of the above activities are cause of deforestation?
I and II only
III and IV only
I, II and III only
I, III and IV only
