Essential for Life - Air & Water Worksheet-8

Essential for Life - Air & Water Worksheet-8

11. True/False

a.      Air contains only oxygen.

b.      Exosphere is the middle layer of the earth.

c.      Atmosphere can be divided into five layers.

d.      Filtration and sedimentation methods are used to separate soluble impurities.

e.      Germs present in the water can make us ill.

f.       Boiled water is the purest form of water that is used in laboratories.

g.      Kerosene is insoluble in water.

h.      Coffee gets dissolved in milk.

I.       Tyre pump that is used for inflating tyre tubes work on the principle of difference in air pressure.

Miscellaneous Questions:

12. Which of the following graph shows the correct rate of evaporation from Sunrise to Sunset?

(A)

(B)

(C)

Fill in the blanks:

13. The method of separating insoluble impurities from the solution by allowing the impurities to settle down at the bottom is known as ____.

Answer Key:

(11)   a. False

          b. False

          c. True

          d. False

          e. True

          f. False

          g. True

          h. True

          i. True

(12)  (C)

(13)  sedimentation/sedimentations