Air around us Worksheet-3

Air around us Worksheet-3


Multiple-Choice Question:

  1. __________ is needed for burning.

(a) Oxygen                                       (b) Argon            

(c) Carbon dioxide                         (d) Nitrogen


  1. Air contains:

(a) water vapour                             (b) oxygen

(c) dust and smoke                         (d) all of these


  1. Air is made up of:

(a) three gases                                 (b) one gas

(c) several gases                              (d) none of these


  1. Main causes of air pollution are:

(a) vehicles releasing smoke         (b) excessive burning of fuels

(c) burning of wood                        (d) all of these


  1. Gas with the highest percentage in air is:

(a) Nitrogen                                     (b) Oxygen

(c) Water vapour                            (d) Carbon dioxide


  1. Air contains _______% of carbon dioxide.

(a) 30.00              (b) 0.030            (c) 3.000              (d) 0.003


  1. What percentage of Earth’s water is fresh?

(a) 20%                (b) 3%                  (c) 10%                (d) 5%


  1. What is the name for the smaller stream that flows into a larger stream?

(a) Delta              (b) Tributary        (c) Valley             (d) Peninsula


  1. What is the source of hydrological or water cycle?

(a) Sun                 (b) Wind              (c) Rain                (d) Snow


  1. What is the process by which vapour becomes a liquid?

(a) Precipitation                              (b) Infiltration

(c) Evaporation                                (d) Condensation


Answer Key:

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