Question

Match the columns I and II, and choose the correct combination from the options given.

	Column I		Column II
a.	Catalytic converter	1.	Particulate matter
b	Electrostatic precipitator	2.	Carbon monoxide and nitrogen oxides
c	Earmuffs	3.	High noise level
d	Landfills	4.	Solid wastes

• A. a—1, b—2, c—3, d—4
• B. a—2, b—3, c—1, d—4
• C. a—2, b—1, c—3, d—4
• D. a—3, b—4, c—2, d—1

Answer 1

The correct option is C a—2, b—1, c—3, d—4

Catalytic converter - carbon monoxide and nitrogen oxides
Catalytic converter is a device fitted into automobiles which convert harmful poisonous gas into less toxic gas. Thus, reducing the emission of poisonous gas.
Harmful gas such as carbon monoxide and nitrogen oxides are converted into less harmful gas such as carbon dioxide and nitrogen and oxygen gas.

Electronic precipitator - particulate matter
An electrostatic precipitator is the most efficient device to remove fine particulate pollutants. It works on the principle of electric charging of dust particles and collecting them on a differently charged platform.
Thus, it removes the particulate matter.

Earmuffs - High noise level
Earmuffs are headgear that protects the ears and shut out external sound.
Noise pollution refers to the loud and disturbing sound which affects the health of humans. To prevent damage to ears and health of the body, earmuffs are used to combat noise pollution, especially in industries where loud sound of machines is generated.

Landfills - solid waste
Landfills are the sites for dumping solid waste in a trench or depression, compressed and covered with dirt.
They are used in place of open burning dumps to prevent rats and flies from coming and breeding over this waste.