Total Marks : 160 Time Taken : 40 Min.

T

his specially designed column enables students to self analyse their

extent of understanding of specified chapters. Give yourself four

marks for correct answer and deduct one mark for wrong answer.

Self check table given at the end will help you to check your

readiness.

-10 Practice Problems

Class XII

• Environmental Issues

1. Select the option which correctly fills the blanks.
   When polyblend is mixed with (i) , it enhances the (ii) and
   helps to increase the road life by a factor of (iii).
   (i) (ii) (iii)
   (a) plastic water repellant properties three
   (b) bitumen smoothness five
   (c) cement frictional force two
   (d) bitumen water repellant properties three


2. Refer to the given figure and select the correct option regarding
   it.
   (a) It is the most widely used device
   which separate the particulate matter
   on the basis of their charges.
   (b) In this, dust-laden fumes are passed
   through the filtering devices formed
   of porous mats of polyster.
   (c) It is formed of dry or wet packing material and is used
   to separate dust and SO 2 from air.
   (d) All of these


3. Choose the incorrect statement.
   (a) Electrostatic precipitators remove 99% of particulates
   present in industrial and thermal plant exhausts.
   (b) Smog causes glazing and necrosis in plants.
   (c) CNG is costly than diesel but cheaper than petrol.
   (d) SO 2 , above 1ppm, causes irritation to eyes and injury to
   respiratory tract.


4. Select the incorrect pair.
   (a) Mercury – Minamata
   (b) Cobalt – Itai-Itai
   (c) Fluoride – Skeletal fluorosis
   (d) Arsenic – Black-foot


5. A baby animal eats plant that grows on selenium rich soil.
   What will be the consequences in that animal on eating
   such plant?

Dust

discharge

Dirty gas

Cleaned gas

(a) It will show stunted growth.

(b) It will be having loss of appetite and gastro-intestinal

disorders.

(c) It will be suffering from cirrhosis of liver.

(d) Both (a) and (b)

6. Select the correct pair.
   (a) Joint Forest Management – 1950
   (b) Water (Prevention and Control – 1980
   of Pollution) Act
   (c) Environment Protection Act – 1974
   (d) Montreal Protocol – 1987


7. Read the following statements and choose the correct ones.
   I. Secondary pollutants are formed by reactions amongst
   the primary pollutants in air.
   II. Soot is the fine particulate matter passed out along
   with gases during burning of coal.
   III. Dry deposition is settling down of wind blown acidic
   gases and particles over trees, various articles and soil.
   IV. Natural source of water pollution includes run-off from
   agricultural fields.
   (a) I and III (b) I and IV
   (c) I and II (d) III and IV


8. Which of the following statements about PAN is incorrect?
   (a) It damages chloroplasts, inhibits electron transport chain
   and spoils enzyme systems controlling cellular metabolism.
   (b) It causes respiratory distress and eye irritation in human
   beings.
   (c) It is an important primary air pollutant.
   (d) It is a secondary pollutant.


9. Bharat stage IV is
   (a) implemented throughout the country since October 2011
   (b) equivalent to Euro-III norms
   (c) the norm of Mass Emission Standard
   (d) implemented throughout the country since October 2010.