Compressed Natural Gas (CNG) is:

1.	Propane	2.	Methane
3.	Ethane	4.	Butane

The world’s most problematic aquatic weed is:

Which of the following exhibits biomagnifications?

The expanded form of DDT is:
1. Dichloro diphenyl trichloroethane
2. Dichloro diethyl trichloroethane
3. Dichloro dipyridyl trichloroethane
4. Dichloro diphenyl tetrachloroacetate

Which of the following material takes the longest time for biodegradation?

Choose the incorrect statement:

Among the following, which one causes the maximum indoor chemical pollution?
1. Burning coal
2. Burning cooking gas
3. Burning mosquito coil
4. Room spray

The green scum seen in the freshwater bodies is:
1. Blue-green algae
2. Red algae
3. Green algae
4. Both 1 and 3

The loudness of a sound that a person can withstand without discomfort is about:

The major source of noise pollution in the world is:
1. Office equipment
2. Transport system
3. Sugar, textile, and paper industries
4. Oil refineries and thermal power plants