Essential for Life - Air & Water Worksheet-7

Essential for Life - Air & Water Worksheet-7


  1. Which of the following gas is essential for the survival of living things?

          (A) Carbon dioxide    (B) Nitrogen               (C) Oxygen


  1. Which of the following is the topmost layer of the Earth’s atmosphere?

          (A) Exosphere            (B) Mesosphere         (C) Stratosphere


  1. Which of the following statement is incorrect for air?

          (A) Air occupies space                                    (B) Air has mass

          (C) Air has definite shape


  1. Impurities that do not get dissolved in water are known as:

          (A) Insoluble impurities                                 (B) Soluble impurities

          (C) None of these


  1. After dissolving some sugar in water, Maya placed the solution under Sunlight for some days and she found only the crystals of sugar and no water. Which of the following process best describes the experiment?

          (A) Sedimentation    (B) Evaporation         (C) Condensation


  1. The given picture best describes the process of:

(A) Sedimentation                        (B) Decantation

       (C) Loading


  1. Nita went to shopping for the whole day. She observed rashes on her skin after coming back from the market. Which of the following might have caused that?

          (A) Sunburns              (B) Allergy                  (C) None of these


  1. Air tubes float on water due to:

          (A) Frictional force                                         (B) Gravitational force

          (C) Air pressure

  1. Difference in _________helps the aeroplane to land and take off from the ground.

          (A) Electrostatic force                                    (B) Air pressure

          (C) Force of friction


Multiple Choice Questions (with more than one option):

  1. Mark the different layers of Earth’s atmosphere.

          (A) Mesosphere         (B) Core                       (C) Mantle

          (D) Thermosphere    (E) Crust


Answer Key:

(1)-(C); (2)-(A); (3)-(C); (4)-(A); (5)-(B); (6)-(A); (7)-(C); (8)-(C); (9)-(B); (10)-(A,D)