NCERT Solutions for Class 12 Help.html Chapter 16 Environmental Issues

Environmental Issues Here is the CBSE Help.html Chapter 16 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Help.html Environmental Issues Chapter 16 NCERT Solutions for Class 12 Help.html Environmental Issues Chapter 16 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Help.html.

Question 1

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In the scrubber in the electrostatic precipitator the gases are passed through :
filter
lime
spray of water
both 2 and 3

Solution

both 2 and 3

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NCERT Solutions for Class 12 Help.html Chapter 16 Environmental Issues

In the scrubber in the electrostatic precipitator the gases are passed through :
filter
lime
spray of water
both 2 and 3

Ozone depletion will cause :
Forest fire
Pneumonia
Increased incidence of skin cancer
None of these

The meaning of BOD is :
Bacterial oxygen demand
Biological optimum density
Biochemical oxygen demand
Bioorganisation decay

Which of the following pollutants is not produced by exhaust of motor vehicles ?
CO
Hydrocarbon
Fly-ash
NO

What is the term for the inflammation of cornea due to high absorption of UV-B radiation :
myopia
snow blindness
biomagnification
None of the above

Smog is a mixture of :
Aluminium ions
Methane and ozone
smoke and fog
water and smoke

WHO’s recommendations about the industrial noise limit is of :
105 dB
75 dB
135 dB
165 dB

Which of the atmospheric layer contains ozone layer ?
Troposphere
Stratosphere
Mesosphere
Thermosphere

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?
Biomagnification
Eutrophication
BOD
COD

The cause of acid rain is :
CO₂ and CO
SO₂ and NO2
SO₃ and CO
Ozone and dust

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For Daily Free Study Material Join wiredfaculty

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NCERT Solutions for Class 12 Help.html Chapter 16 Environmental Issues

In the scrubber in the electrostatic precipitator the gases are passed through : filterlimespray of waterboth 2 and 3

Ozone depletion will cause : Forest fire Pneumonia Increased incidence of skin cancer None of these

The meaning of BOD is : Bacterial oxygen demandBiological optimum densityBiochemical oxygen demandBioorganisation decay

Which of the following pollutants is not produced by exhaust of motor vehicles ? COHydrocarbonFly-ashNO

What is the term for the inflammation of cornea due to high absorption of UV-B radiation : myopiasnow blindnessbiomagnificationNone of the above

Smog is a mixture of : Aluminium ionsMethane and ozonesmoke and fogwater and smoke

WHO’s recommendations about the industrial noise limit is of : 105 dB75 dB135 dB165 dB

Which of the atmospheric layer contains ozone layer ? TroposphereStratosphereMesosphereThermosphere

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ? BiomagnificationEutrophicationBODCOD

The cause of acid rain is : CO2 and COSO2 and NO2SO3 and COOzone and dust

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

In the scrubber in the electrostatic precipitator the gases are passed through :
filter
lime
spray of water
both 2 and 3

Ozone depletion will cause :
Forest fire
Pneumonia
Increased incidence of skin cancer
None of these

The meaning of BOD is :
Bacterial oxygen demand
Biological optimum density
Biochemical oxygen demand
Bioorganisation decay

Which of the following pollutants is not produced by exhaust of motor vehicles ?
CO
Hydrocarbon
Fly-ash
NO

What is the term for the inflammation of cornea due to high absorption of UV-B radiation :
myopia
snow blindness
biomagnification
None of the above

Smog is a mixture of :
Aluminium ions
Methane and ozone
smoke and fog
water and smoke

WHO’s recommendations about the industrial noise limit is of :
105 dB
75 dB
135 dB
165 dB

Which of the atmospheric layer contains ozone layer ?
Troposphere
Stratosphere
Mesosphere
Thermosphere

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?
Biomagnification
Eutrophication
BOD
COD

The cause of acid rain is :
CO₂ and CO
SO₂ and NO2
SO₃ and CO
Ozone and dust