Which of the following statements is not true regarding CNG?
1. It is non-polluting
2. It burns more efficiently than petrol and diesel
3. It cannot be siphoned off by thieves
4. It cannot be adulterated

According to CPCB, what particulate size is most harmful to humans:
1. more than 10 micrometers
2. between 5 to 10 micrometers
3. between 2.5 and 5 micrometers
4. less than 2.5 micrometers

The most effective device to remove particulate matter from polluted air is:
1. electrostatic precipitator

2. cyclonic separator

3. trajectory separator

4. scrubber

The device, normally used to remove gaseous pollutants from polluted air but can remove large particulate matter as well, is:
1. electrostatic precipitator

2. cyclonic separator

3. trajectory separator

4. Scrubber

In an algal bloom, the cause of death of other algae is usually:
1. toxins

2. decreased DO

3. decreased sunlight

4. decreased nutrients

Combustion of solid wastes in the absence of oxygen is known as:

Radiatively active gases do not include:
1. Methane

2. Ammonia

3. Nitrous oxide

4. Chloroflouro carbons

A substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource is called:

Hot wastewater discharged from industries into water bodies:

Biomagnification can occur as a result of: