The thickness of ozone in a column of air in the atmosphere is measured in terms of:

NEET-2023 [Environmental-Issues] [class-xii ]

• Kilobase
• Dobson units
• Decameter
• Decibels
Correct Option: B  [ Dobson units ]

Remark:

Which of the following answers are NOT correct?

NEET-2023 [Environmental-Issues] [class-xii ]

• The amount of some toxic substances of industrial waste water increases in the organisms at Successive trophic levels.
• The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms.
• Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries.
• Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body.
Correct Option: C  [ Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries. ]

Remark:

Which of the following statements is correct?

NEET-2023 [Environmental-Issues] [class-xii ]

• Algal Bloom decreases fish mortality.
• Eutrophication refers to increase in domestic sewage and waste water in lakes.
• Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
• Presence of large amount of nutrients in water restricts 'Algal Bloom'.
Correct Option: C  [ Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. ]

Remark:

Given below are two statements:
Statement I: Electrostatic precipitator is most widely used in thermal power plant.
Statement II: Electrostatic precipitator in thermal power plant removes ionising radiations
In the light of the above statements, choose the most appropriate answer from the options given below:

NEET-2023 [Environmental-Issues] [class-xii ]

• Statement I incorrect but Statement II is correct.
• Both Statement I and Statement II are correct.
• Both Statement I and Statement II are incorrect.
• Statement I is correct but Statement II is incorrect.
Correct Option: D  [ Statement I is correct but Statement II is incorrect. ]

Remark:

The device which can remove particulate matter present in the exhaust from a thermal power plant is :

NEET-2022 [Environmental-Issues] [class-xii ]

• STP
• Incinerator
• Electrostatic Precipitator
• Catalytic Convertor
Correct Option: C  [ Electrostatic Precipitator ]

Remark:

The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?

NEET-2022 [Environmental-Issues] [class-xii ]

• CNG burns more efficiently than diesel
• The same diesel engine is used in CNG buses making the cost of conversion low
• It is cheaper than diesel
• It cannot be adulterated like diesel
Correct Option: B  [ The same diesel engine is used in CNG buses making the cost of conversion low ]

Remark:

Given below are two statements:
Statement I: In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles.
Statement II: Particulate matter (PM 2.5) can not be removed by scrubber but can be removed by an electrostatic precipitator.
In the light of the above statements, choose the most appropriate answer from the options given below:

NEET-2022 [Environmental-Issues] [class-xii ]

• Both Statement I and Statement II are incorrect
• Statement I is correct but Statement II is incorrect
• Statement I is incorrect but Statement II is correct
• Both Statement I and Statement II are correct
Correct Option: A  [ Both Statement I and Statement II are incorrect ]

Remark:

Dobson units are used to measure thickness of:

NEET-2021 [Environmental-Issues] [class-xii ]

• CFCs
• Stratosphere
• Ozone
• Troposphere
Correct Option: C  [ Ozone ]

Remark:

Air (Prevention and Control of Pollution) Act was amended in 1987 to include among pollutants:

NEET-(Oct)2020 [Environmental-Issues] [class-xii ]

• Vehicular exhaust
• Allergy causing pollen
• Noise
• Particulates of size 2.5 micrometer or below
Correct Option: C  [ Noise ]

Remark:

Which of the following is put into Anaerobic sludge digester for further sewage treatment?

NEET-(Sept)2020 [Environmental-Issues] [class-xii ]

• Primary sludge
• Floating debris
• Effluents of primary treatment
• Activated sludge
Correct Option: D  [ Activated sludge ]

Remark: