Garbage in, garbage out Worksheet-4

Garbage in, garbage out Worksheet-4

 

Multiple-Choice Question:

  1. Pollutant gases have an adverse effect on the environment and on our health. The amount of these gases has been steadily increasing over the years.

The table below shows the source and the amount of some pollutant gases produced by human activities:

   

Which one of the following statements is correct?

(a) Carbon dioxide is produced by industries

(b) Hydrocarbons are produced by vehicle exhaust gases only.

(c) The total sulphur dioxide and nitrogen dioxide produced per year is 145 million tonnes.

(d) The combined total pollutant gases produced by nitrogen oxide and hydrocarbons, is less than the total produced by sulphur dioxide.

 

  1. The consequences of global warming may be:

(a) melting of Himalayan Glaciers

(b) eutrophication

(c) increased biochemical oxygen demand

(d) increase in average temperature of the earth

 

  1. Phosphate containing fertilizers cause water pollution. Addition of such compounds in water body causes:

(a) decrease in amount of dissolved oxygen in water

(b) increase in fish population

(c) deposition of calcium phosphate

(d) enhanced growth of algae

 

  1. Which of the following conditions show the polluted environment?

(a) Amount of carbon dioxide in the atmosphere is 0.03%

(b) pH of rain water is 5.6

(c) Eutrophication

(d) Biochemical oxygen demand 10 ppm

 

  1. Which of the following statements is correct?

(a) Ozone hole is thinning of ozone layer of stratosphere at some places.

(b) Ozone hole is a hole formed in the troposphere from which ozone oozes out.

(c) Ozone hole means vanishing of ozone layer around the earth completely.

(d) Ozone hole is a hole formed in stratosphere from which ozone oozes out.

 

  1. The pollutants which come from different sources directly into the air are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?

(a) Hydrocarbon                              (b) CO

(c) O3                                                            (d) NO

 

  1. Dinitrogen and dioxygen are main constituents of air but these do not react with each other to form oxides of nitrogen because:

(a) oxides of nitrogen are formed but they are unstable.

(b) the reaction between them is endothermic (requires high energy)

(c) the reaction can be initiated only in presence of a catalyst.

(d) All of these

 

  1. The gaseous envelope around the earth is known as atmosphere. The lowest layer of this is extended upto 10 km from sea level, this layer is:

(a) Hydrosphere                              (b) Troposphere

(c) Stratosphere                               (d) Mesosphere

 

  1. Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of:

(a) Increase in the amount of dissolved oxygen.

(b) Large number of mosquitoes.

(c) Decrease in the amount of dissolved oxygen in water.

(d) Clogging of gills by mud.

 

  1. Which of the following statements is wrong?

(a) Ozone is a strong oxidising agent

(b) Ozone hole is thinning of ozone layer present in the stratosphere.

(c) Ozone layer is not responsible for green house effect.

(d) Ozone is produced in upper stratosphere by the action of UV rays on oxygen.

 

Answer Key:

  1. (d)
  2. (d)
  3. (c)
  4. (d)
  5. (a)
  6. (c)
  7. (b)
  8. (b)
  9. (c)
  10. (d)