Pollution of Air and Water Worksheet-8

Pollution of Air and Water Worksheet-8

1. What are the effects of discharging excess heat from electrical power stations into rivers and lakes?

I – The biological oxygen demand value of the water decreases.

II – Instant death of certain organisms.

III – The population of algae increases.

IV – The concentration of dissolved oxygen increases.

(a) I and IV only                           (b) II and III only

(c) I, II and III only                      (d) II, III and IV only

2. Which of the following dissolves more rapidly in blood haemoglobin than oxygen?

(a) Ozone                                        (b) Nitrous oxide

(c) Sulphur dioxide                      (d) Carbon monoxide

3. Which of the following is NOT an air pollutant?

(a) N₂                  (b) N₂O              (c) NO                (d) CO

4. Why would a rise in temperature cause a rise in sea level?

(a) More water in the atmosphere would condense, so more rainfall will occur

(b) Sea water would expand because of increased heating

(c) Ice caps and glaciers would melt

(d) The effect of the moon's gravity would be greater through the warmer, thinner air.

5. Frogs and toads seem to be disproportionately affected by pollution in comparison to many other animals, including other amphibians. What might explain this?

(a) They have to live in two environments, water and land, so they face two kinds of pollution

(b) They tend to live in places throughout the world that are crowded with people

(c) They have    thin skin that does not protect them very well from environmental dangers

(d) They eat insects that are very dirty.

6. Match column I with column II and select the correct option from the codes given below.

(a) (A)-(III), (B)-(V), (C)-(IV), (D)-(II), (E)-(I)

(b) (A)-(IV), (B)-(III), (C)-(II), (D)-(V), (E)-(I)

(c) (A)-(I), (B)-(II), (C)-(III), (D)-(IV), (E)-(V)

(d) (A)-(II), (B)-(III), (C)-(IV), (D)-(V), (E)-(I)

7. Which of the following methods will reduce air pollution?

(a) Planting of trees                     (b) Use of LPG and CNG

(c) Use of catalytic converter     (d) All of these

8. Water pollution is responsible for number of infectious diseases. Which of the following diseases is not caused due to water pollution?

(a) Cholera        (b) Typhoid       (c) Diarrhoea    (d) Swine flu

9. The given figure shows a process in which water is purified. Name the process.

(a) Reverse osmosis                     (b) Decantation

(c) Distillation                               (d) Disinfection

10. Air pollutants are harmful to living things. Which of the following shows their harmful effects?

(i)    They form acid rain.

(ii)   They cause breathing problems in animals.

(iii)  They can interfere with photosynthesis in plants.

(iv)  They cause diseases in the respiratory system of man and animals

(a) They form acid rain

(b) They form acid rain & They cause breathing problems in animals

(c) They form acid rain, They cause breathing problems in animals & They can interfere with photosynthesis in plants

(d) They form acid rain, They cause breathing problems in animals, They can interfere with photosynthesis in plants & They cause diseases in the respiratory system of man and animals

Answer Key:

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