Q.2 According to the Central Pollution Control Board, particles that are responsible for causing great harm to human health are of a diameter

1. 2.50 micrometers

2. 5.00 micrometers

3. 10.00 micrometers

4. 7.5 micrometers

Q.5 World's most problematic aquatic weed is

1. Azolla

2. Wolffia

3. Eichhornia

4. Trapa

Choose the incorrect statement :

1. The Montreal protocol is associated with the control of emission of ozone-depleting substances

2. Methane and carbon dioxide are greenhouse gases

3. Dobson units are used to measure the oxygen content

4. Use of incinerators is crucial to the disposal of hospital waste

Q.6 Which of the following causes biomagnification?

1. ${\mathrm{SO}}_2$

2. Mercury

3. DDT

4. Both (b) and (C)

Q.1 Non-biodegradable pollutants are created by

1. nature

2. excessive use of resources

3. humans

4. natural disasters

The expanded form of DDT is

1. dichloro diphenyl trichloroethane

2. dichloro diethyl trichloroethane

3. dichloro dipyridyl trichloroethane

4. dichloro diphenyl tetrachloroacetate

Q. 8 Which of the following material takes the longest time for biodegradation?

1. Cotton

2. Paper

3. Bone

4. Jute

Q.3 The material generally used for soundproofing of rooms like a recording studio and auditorium etc., is

1. cotton

2. )coir

3. wood

4. styrofoam

Compressed Natural Gas (CNG) is

1. propane

2. methane

3. ethane

4. butane

Q.10 Among the following which one causes more indoor chemical pollution?

1. Burning coal

2. Burning mosquito coil

3. Burning cooking gas

4. Room spray