The light of cities is reduced in comparison to villages due to the presence of:

Related Mcqs:

1. Sometimes sound and uninjured seeds may fail to germinate due to reduced activity of the seed or seed parts resulting in blockade of the growth. This may be due to:

   A. External effects of environment
   B. Internal conditions within the plant itself, i.e. Embryo dormancy or seed coat dormancy
   C. Both (a) & (b)
   D. None of these

2. The main cause of pollution in metro cities is due to:

   A. Industries
   B. Automobiles
   C. Home fuel
   D. Trees

3. In big cities, air pollution is mainly due to:

   A. Burning of fossil fuel
   B. Thermal power plants
   C. Sewage
   D. Suspended particles

4. Certain cities of Pakistan have been subjected to tremendous air pollution due to increased:

   A. Urbanization
   B. Mechanization
   C. Industrialization
   D. Civilization

5. Tajmahal is threatened due to the presence of:

   A. Chlorine/NO2
   B. SO2
   C. Oxygen/ozone
   D. Hydrocarbons

6. Green-house effect is due to the presence of:

   A. Ozone layer in the atmosphere
   B. Infra-red radiations
   C. Moisture in the atmosphere
   D. CO2 in the atmosphere

7. Photochemical smog formed in congested metropolitan cities mainly consists of:

   A. Ozone, peroxyacetyl nitrate and No2
   B. Smoke, peroxyacetyl nitrate and SO2
   C. Hydrocarbons, SO2 and CO2
   D. Hydrocarbons, ozone and SO2

8. The air pollution caused by phosphate fertilizer factories is due to:The air pollution caused by phosphate fertilizer factories is due to:

   A. Phosphene
   B. SiF4
   C. Dust
   D. Halogens

9. The automobile emission can be reduced by adding the following in the petrol:

   A. Calcium salts
   B. Cobalt salts
   C. Silicon oil
   D. Barium salts

10. The unclassified area which constituted more than ____ of the total area at the time of independence, in due course of time, has dropped to the present level due to extension in the land use:

    A. 40%
    B. 50%
    C. 60%
    D. 70%