Essential for Life - Air & Water Worksheet-9

Essential for Life - Air & Water Worksheet-9

Multiple-Choice Question:

1. What percentage (%) of nitrogen is present in the air?

(A) 78%                        (B) 75%                        (C) 79%

2. Which of the following gas is responsible for depletion of ozone layer?

(A) Methane               (B) Propane                (C) Chlorofluorocarbons

3. Why it is not possible to open the lid of pressure cooker when it is hot?

(A) The pressure of steam holds the lid tightly

(B) The pressure of water holds the lid tightly

(C) The pressure of air inside the cooker holds the lid tightly

4. Which of the following is soluble in water?

(A) Stones                   (B) Sand                      (C) Salt

5. Amit took some muddy water and tried to filter it by using different means to get clean water. By using which of the following methods do you think he will be able to get clean water?

A.

B.

C.

6. The given picture best describes the process of:

(A) Filtration              (B) Decantation         (C) Distillation

7. Which of the following factor/s is/are responsible for sunburns?

(A) Depletion of exosphere

(B) Depletion of thermosphere

(C) Depletion of Ozone layer

8. Perfumes and food flavours which are used in daily life are extracted and purified by using the method of:

(A) Evaporation         (B) Distillation          (C) Filtration

9. Is it possible to separate salt from water?

(A) No                          (B) Yes                          (C) Can’t say

Multiple Choice Questions (with more than one option):

10. Which of the following method/s is/are used for purification of water?

(A) Boiling                  (B) Sedimentation    (C) Loading

       (D) Distillation           (E) Chlorination

Answer Key:

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