UPSC Current Affairs Quiz : 9 January 2026

The Current Affairs Quiz is a daily quiz based on the DAILY CURRENT AFFAIRS AND PIB SUMMARY from the previous day, as posted on our website. It covers all relevant news sources and is designed to test your knowledge of current events. Solving these questions will help you retain both concepts and facts relevant to the UPSC IAS civil services exam.

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• Question 1 of 10 1. Question 1 points The ‘Eastern Ice Shelf (TEIS)’, recently in the news for rapid fracturing and deterioration, is associated with which of the following? (a) Greenland Ice Sheet (b) Lambert Glacier (c) Thwaites Glacier (d) Pine Island Glacier Correct Solution: C The Eastern Ice Shelf (TEIS) is the floating extension of the Thwaites Glacier (Doomsday Glacier) in West Antarctica. It plays a crucial role as a “braking system” because it is anchored by an undersea ridge, known as a pinning point. This contact with the seabed slows the flow of ice from the glacier into the Amundsen Sea. Scientists are concerned because the TEIS is developing massive fractures, which could lead to its disintegration. If the shelf collapses, the “pinning” effect is lost, allowing the glacier to flow much faster into the ocean, accelerating sea-level rise. Incorrect Solution: C The Eastern Ice Shelf (TEIS) is the floating extension of the Thwaites Glacier (Doomsday Glacier) in West Antarctica. It plays a crucial role as a “braking system” because it is anchored by an undersea ridge, known as a pinning point. This contact with the seabed slows the flow of ice from the glacier into the Amundsen Sea. Scientists are concerned because the TEIS is developing massive fractures, which could lead to its disintegration. If the shelf collapses, the “pinning” effect is lost, allowing the glacier to flow much faster into the ocean, accelerating sea-level rise.

#### 1. Question

The ‘Eastern Ice Shelf (TEIS)’, recently in the news for rapid fracturing and deterioration, is associated with which of the following?

• (a) Greenland Ice Sheet

• (b) Lambert Glacier

• (c) Thwaites Glacier

• (d) Pine Island Glacier

Solution: C

• The Eastern Ice Shelf (TEIS) is the floating extension of the Thwaites Glacier (Doomsday Glacier) in West Antarctica.

• It plays a crucial role as a “braking system” because it is anchored by an undersea ridge, known as a pinning point. This contact with the seabed slows the flow of ice from the glacier into the Amundsen Sea.

• Scientists are concerned because the TEIS is developing massive fractures, which could lead to its disintegration. If the shelf collapses, the “pinning” effect is lost, allowing the glacier to flow much faster into the ocean, accelerating sea-level rise.

Solution: C

• The Eastern Ice Shelf (TEIS) is the floating extension of the Thwaites Glacier (Doomsday Glacier) in West Antarctica.

• Question 2 of 10 2. Question 1 points With reference to the Directorate General of Mines Safety (DGMS), consider the following statements: It is a statutory body functioning under the administrative control of the Ministry of Mines. It is responsible for the enforcement of the Mines Act, 1952. Its headquarters is located in the ‘Coal Capital of India’, Dhanbad. How many of the above statements are incorrect? (a) Only one (b) Only two (c) All three (d) None Correct Solution: A Statement 1 is incorrect: While the DGMS deals with mining, it is a statutory regulatory authority under the Ministry of Labour & Employment, not the Ministry of Mines. Its primary focus is the safety, health, and welfare of workers. Statement 2 is correct: The DGMS is the primary agency responsible for the administration and enforcement of the Mines Act, 1952, and the various rules and regulations framed under it regarding coal, metalliferous, and oil mines. Statement 3 is correct: The headquarters of DGMS is located in Dhanbad, Jharkhand, which is often referred to as the ‘Coal Capital of India’ due to its extensive coal mining reserves. Incorrect Solution: A Statement 1 is incorrect: While the DGMS deals with mining, it is a statutory regulatory authority under the Ministry of Labour & Employment, not the Ministry of Mines. Its primary focus is the safety, health, and welfare of workers. Statement 2 is correct: The DGMS is the primary agency responsible for the administration and enforcement of the Mines Act, 1952, and the various rules and regulations framed under it regarding coal, metalliferous, and oil mines. Statement 3 is correct: The headquarters of DGMS is located in Dhanbad, Jharkhand, which is often referred to as the ‘Coal Capital of India’ due to its extensive coal mining reserves.

#### 2. Question

With reference to the Directorate General of Mines Safety (DGMS), consider the following statements:

• It is a statutory body functioning under the administrative control of the Ministry of Mines.

• It is responsible for the enforcement of the Mines Act, 1952.

• Its headquarters is located in the ‘Coal Capital of India’, Dhanbad.

How many of the above statements are incorrect?

• (a) Only one

• (b) Only two

• (c) All three

Solution: A

• Statement 1 is incorrect: While the DGMS deals with mining, it is a statutory regulatory authority under the Ministry of Labour & Employment, not the Ministry of Mines. Its primary focus is the safety, health, and welfare of workers.

• Statement 2 is correct: The DGMS is the primary agency responsible for the administration and enforcement of the Mines Act, 1952, and the various rules and regulations framed under it regarding coal, metalliferous, and oil mines.

• Statement 3 is correct: The headquarters of DGMS is located in Dhanbad, Jharkhand, which is often referred to as the ‘Coal Capital of India’ due to its extensive coal mining reserves.

Solution: A

• Statement 3 is correct: The headquarters of DGMS is located in Dhanbad, Jharkhand, which is often referred to as the ‘Coal Capital of India’ due to its extensive coal mining reserves.

• Question 3 of 10 3. Question 1 points Consider the following statements regarding the Census of India 2027: Statement I: The Census 2027 will be the first synchronous census conducted in India after a gap of more than ten years. Statement II: The 2027 Census will incorporate a self-enumeration facility, allowing citizens to provide details digitally. Which one of the following is correct in respect of the above statements? (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I (c) Statement-I is correct but Statement-II is incorrect (d) Statement-I is incorrect but Statement-II is correct Correct Solution: B Statement I is correct: The last synchronous census was conducted in 2011. The 2021 Census was delayed due to the COVID-19 pandemic. Therefore, the 2027 exercise marks the return of the decadal census after a significant gap. Statement II is correct: For the first time, a self-enumeration facility will be provided, allowing citizens to fill in their details online via a portal or mobile app. While both statements are true, the provision of a digital self-enumeration facility (Statement II) is a feature of the new census, but it does not explain why it is the first synchronous census in over a decade (which was due to the pandemic delay). Incorrect Solution: B Statement I is correct: The last synchronous census was conducted in 2011. The 2021 Census was delayed due to the COVID-19 pandemic. Therefore, the 2027 exercise marks the return of the decadal census after a significant gap. Statement II is correct: For the first time, a self-enumeration facility will be provided, allowing citizens to fill in their details online via a portal or mobile app. While both statements are true, the provision of a digital self-enumeration facility (Statement II) is a feature of the new census, but it does not explain why it is the first synchronous census in over a decade (which was due to the pandemic delay).

#### 3. Question

Consider the following statements regarding the Census of India 2027:

Statement I: The Census 2027 will be the first synchronous census conducted in India after a gap of more than ten years.

Statement II: The 2027 Census will incorporate a self-enumeration facility, allowing citizens to provide details digitally.

Which one of the following is correct in respect of the above statements?

• (a) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I

• (b) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I

• (c) Statement-I is correct but Statement-II is incorrect

• (d) Statement-I is incorrect but Statement-II is correct

Solution: B

• Statement I is correct: The last synchronous census was conducted in 2011. The 2021 Census was delayed due to the COVID-19 pandemic. Therefore, the 2027 exercise marks the return of the decadal census after a significant gap.

• Statement II is correct: For the first time, a self-enumeration facility will be provided, allowing citizens to fill in their details online via a portal or mobile app.

• While both statements are true, the provision of a digital self-enumeration facility (Statement II) is a feature of the new census, but it does not explain why it is the first synchronous census in over a decade (which was due to the pandemic delay).

Solution: B

• Statement II is correct: For the first time, a self-enumeration facility will be provided, allowing citizens to fill in their details online via a portal or mobile app.

• Question 4 of 10 4. Question 1 points With reference to ‘Bio-bitumen’, consider the following statements: Statement I: Bio-bitumen is a bio-based binder produced from agricultural residues like rice straw. Statement II: It can replace conventional petroleum-based bitumen up to 100% in national highway construction without performance loss. Which one of the following is correct in respect of the above statements? (a) Statement-I is correct but Statement-II is incorrect (b) Statement-I is incorrect but Statement-II is correct (c) Both Statement-I and Statement-II are correct (d) Both Statement-I and Statement-II are incorrect Correct Solution: A Statement I is correct: Bio-bitumen is an eco-friendly alternative to conventional bitumen, produced via the pyrolysis of biomass such as rice straw. India is the first country to produce it commercially. Statement II is incorrect: Currently, bio-bitumen is used as a partial replacement for petroleum bitumen. Studies by CSIR-CRRI and CSIR-IIP indicate that about 20–30% of conventional bitumen can be safely replaced without compromising the road’s durability and performance. It is not yet a 100% replacement for highway-grade asphalt. Incorrect Solution: A Statement I is correct: Bio-bitumen is an eco-friendly alternative to conventional bitumen, produced via the pyrolysis of biomass such as rice straw. India is the first country to produce it commercially. Statement II is incorrect: Currently, bio-bitumen is used as a partial replacement for petroleum bitumen. Studies by CSIR-CRRI and CSIR-IIP indicate that about 20–30% of conventional bitumen can be safely replaced without compromising the road’s durability and performance. It is not yet a 100% replacement for highway-grade asphalt.

#### 4. Question

With reference to ‘Bio-bitumen’, consider the following statements:

Statement I: Bio-bitumen is a bio-based binder produced from agricultural residues like rice straw.

Statement II: It can replace conventional petroleum-based bitumen up to 100% in national highway construction without performance loss.

Which one of the following is correct in respect of the above statements?

• (a) Statement-I is correct but Statement-II is incorrect

• (b) Statement-I is incorrect but Statement-II is correct

• (c) Both Statement-I and Statement-II are correct

• (d) Both Statement-I and Statement-II are incorrect

Solution: A

• Statement I is correct: Bio-bitumen is an eco-friendly alternative to conventional bitumen, produced via the pyrolysis of biomass such as rice straw. India is the first country to produce it commercially.

• Statement II is incorrect: Currently, bio-bitumen is used as a partial replacement for petroleum bitumen. Studies by CSIR-CRRI and CSIR-IIP indicate that about 20–30% of conventional bitumen can be safely replaced without compromising the road’s durability and performance. It is not yet a 100% replacement for highway-grade asphalt.

Solution: A

• Question 5 of 10 5. Question 1 points ‘Anvesha’ (EOS-N1), to be launched by ISRO in 2026, is primarily a: (a) Communication satellite for 6G technology. (b) Navigation satellite for the NAVIC constellation. (c) Hyperspectral Earth observation satellite. (d) Space telescope to study Exoplanets. Correct Solution: C EOS-N1, codenamed Anvesha, is an advanced hyperspectral Earth observation satellite. Unlike multispectral sensors that capture data in a few broad bands, hyperspectral sensors capture data across hundreds of narrow spectral bands. This allows for the “fingerprinting” of materials on the Earth’s surface, making it highly effective for identifying specific mineral types, crop diseases, and camouflaged military assets. It is a dual-use asset serving both strategic (defence) and civilian (agriculture/environment) needs. Incorrect Solution: C EOS-N1, codenamed Anvesha, is an advanced hyperspectral Earth observation satellite. Unlike multispectral sensors that capture data in a few broad bands, hyperspectral sensors capture data across hundreds of narrow spectral bands. This allows for the “fingerprinting” of materials on the Earth’s surface, making it highly effective for identifying specific mineral types, crop diseases, and camouflaged military assets. It is a dual-use asset serving both strategic (defence) and civilian (agriculture/environment) needs.

#### 5. Question

‘Anvesha’ (EOS-N1), to be launched by ISRO in 2026, is primarily a:

• (a) Communication satellite for 6G technology.

• (b) Navigation satellite for the NAVIC constellation.

• (c) Hyperspectral Earth observation satellite.

• (d) Space telescope to study Exoplanets.

Solution: C

• EOS-N1, codenamed Anvesha, is an advanced hyperspectral Earth observation satellite.

• Unlike multispectral sensors that capture data in a few broad bands, hyperspectral sensors capture data across hundreds of narrow spectral bands.

• This allows for the “fingerprinting” of materials on the Earth’s surface, making it highly effective for identifying specific mineral types, crop diseases, and camouflaged military assets. It is a dual-use asset serving both strategic (defence) and civilian (agriculture/environment) needs.

Solution: C

• EOS-N1, codenamed Anvesha, is an advanced hyperspectral Earth observation satellite.

• Unlike multispectral sensors that capture data in a few broad bands, hyperspectral sensors capture data across hundreds of narrow spectral bands.

• Question 6 of 10 6. Question 1 points Which of the following is the institutional mechanism established to monitor the implementation of the 1996 Ganga Water Sharing Treaty? (a) Permanent Indus Commission (b) Joint Rivers Commission (JRC) (c) Joint Committee with equal representation (d) South Asian Water Management Board Correct Solution: C The treaty established a Joint Committee with equal representation from India and Bangladesh. Its role is to monitor the daily flows at the Farakka Barrage (in India) and the Hardinge Bridge (in Bangladesh). The Committee submits annual reports to both governments and serves as the primary body to resolve any disputes regarding the day-to-day sharing schedule. While the Joint Rivers Commission (JRC) exists as a broader bilateral body for water issues, the specific monitoring for this treaty is the task of the Joint Committee. Incorrect Solution: C The treaty established a Joint Committee with equal representation from India and Bangladesh. Its role is to monitor the daily flows at the Farakka Barrage (in India) and the Hardinge Bridge (in Bangladesh). The Committee submits annual reports to both governments and serves as the primary body to resolve any disputes regarding the day-to-day sharing schedule. While the Joint Rivers Commission (JRC) exists as a broader bilateral body for water issues, the specific monitoring for this treaty is the task of the Joint Committee.

#### 6. Question

Which of the following is the institutional mechanism established to monitor the implementation of the 1996 Ganga Water Sharing Treaty?

• (a) Permanent Indus Commission

• (b) Joint Rivers Commission (JRC)

• (c) Joint Committee with equal representation

• (d) South Asian Water Management Board

Solution: C

• The treaty established a Joint Committee with equal representation from India and Bangladesh.

• Its role is to monitor the daily flows at the Farakka Barrage (in India) and the Hardinge Bridge (in Bangladesh).

• The Committee submits annual reports to both governments and serves as the primary body to resolve any disputes regarding the day-to-day sharing schedule.

• While the Joint Rivers Commission (JRC) exists as a broader bilateral body for water issues, the specific monitoring for this treaty is the task of the Joint Committee.

Solution: C

• The treaty established a Joint Committee with equal representation from India and Bangladesh.

• Its role is to monitor the daily flows at the Farakka Barrage (in India) and the Hardinge Bridge (in Bangladesh).

• The Committee submits annual reports to both governments and serves as the primary body to resolve any disputes regarding the day-to-day sharing schedule.

• While the Joint Rivers Commission (JRC) exists as a broader bilateral body for water issues, the specific monitoring for this treaty is the task of the Joint Committee.

• Question 7 of 10 7. Question 1 points Consider the following statements regarding ‘White Dwarfs’: They are the dense remnants of stars that were once much more massive than the Sun. They are supported against gravitational collapse by electron degeneracy pressure. The ‘Chandrasekhar Limit’ defines the maximum mass a white dwarf can have. How many of the above statements are correct? (a) Only one (b) Only two (c) All three (d) None Correct Solution: B Statement 1 is incorrect: White dwarfs are the remnants of Sun-like stars (low to medium mass). Extremely massive stars end their lives as neutron stars or black holes after a supernova explosion. Statement 2 is correct: Unlike active stars supported by nuclear fusion, white dwarfs are supported by electron degeneracy pressure, a quantum mechanical effect arising from the Pauli Exclusion Principle. Statement 3 is correct: The Chandrasekhar Limit (approx. 1.4 times the mass of the Sun) is the maximum mass a white dwarf can reach before it can no longer support itself and either collapses or explodes (Type Ia Supernova). Incorrect Solution: B Statement 1 is incorrect: White dwarfs are the remnants of Sun-like stars (low to medium mass). Extremely massive stars end their lives as neutron stars or black holes after a supernova explosion. Statement 2 is correct: Unlike active stars supported by nuclear fusion, white dwarfs are supported by electron degeneracy pressure, a quantum mechanical effect arising from the Pauli Exclusion Principle. Statement 3 is correct: The Chandrasekhar Limit (approx. 1.4 times the mass of the Sun) is the maximum mass a white dwarf can reach before it can no longer support itself and either collapses or explodes (Type Ia Supernova).

#### 7. Question

Consider the following statements regarding ‘White Dwarfs’:

• They are the dense remnants of stars that were once much more massive than the Sun.

• They are supported against gravitational collapse by electron degeneracy pressure.

• The ‘Chandrasekhar Limit’ defines the maximum mass a white dwarf can have.

How many of the above statements are correct?

• (a) Only one

• (b) Only two

• (c) All three

Solution: B

• Statement 1 is incorrect: White dwarfs are the remnants of Sun-like stars (low to medium mass). Extremely massive stars end their lives as neutron stars or black holes after a supernova explosion.

• Statement 2 is correct: Unlike active stars supported by nuclear fusion, white dwarfs are supported by electron degeneracy pressure, a quantum mechanical effect arising from the Pauli Exclusion Principle.

• Statement 3 is correct: The Chandrasekhar Limit (approx. 1.4 times the mass of the Sun) is the maximum mass a white dwarf can reach before it can no longer support itself and either collapses or explodes (Type Ia Supernova).

Solution: B

• Question 8 of 10 8. Question 1 points The ‘Gippsland Basin’, located in southeastern Victoria, Australia is primarily significant for which of the following? (a) Large-scale gold mining operations. (b) Extensive oil and gas reserves. (c) High-altitude viticulture. (d) Rare earth element deposits. Correct Solution: B The Gippsland Basin is one of Australia’s most prolific energy provinces. It contains significant oil and natural gas reserves that have been a major contributor to Australia’s energy sector and Victoria’s economy for decades. The region also features fertile plains, though it is highly susceptible to bushfires during the summer months. Incorrect Solution: B The Gippsland Basin is one of Australia’s most prolific energy provinces. It contains significant oil and natural gas reserves that have been a major contributor to Australia’s energy sector and Victoria’s economy for decades. The region also features fertile plains, though it is highly susceptible to bushfires during the summer months.

#### 8. Question

The ‘Gippsland Basin’, located in southeastern Victoria, Australia is primarily significant for which of the following?

• (a) Large-scale gold mining operations.

• (b) Extensive oil and gas reserves.

• (c) High-altitude viticulture.

• (d) Rare earth element deposits.

Solution: B

• The Gippsland Basin is one of Australia’s most prolific energy provinces.

• It contains significant oil and natural gas reserves that have been a major contributor to Australia’s energy sector and Victoria’s economy for decades.

• The region also features fertile plains, though it is highly susceptible to bushfires during the summer months.

Solution: B

• The Gippsland Basin is one of Australia’s most prolific energy provinces.

• It contains significant oil and natural gas reserves that have been a major contributor to Australia’s energy sector and Victoria’s economy for decades.

• The region also features fertile plains, though it is highly susceptible to bushfires during the summer months.

• Question 9 of 10 9. Question 1 points Which of the following are the new digital features of the Census of India 2027? Use of Android and iOS mobile applications for data collection. Real-time monitoring through the Census Management & Monitoring System (CMMS). Geo-referencing of census blocks using a GIS-based House listing Block (HLB) Creator. “Census-as-a-Service” (CaaS) to provide machine-readable datasets to various ministries. Select the correct answer using the code given below: (a) 1, 2 and 3 only (b) 2, 3 and 4 only (c) 1 and 4 only (d) 1, 2, 3 and 4 Correct Solution: D The 2027 Census is designed as India’s first fully digital census. Point 1 is correct: Enumerators will use mobile apps for data entry, moving away from traditional paper schedules. Point 2 is correct: The CMMS will allow for real-time tracking of the progress of enumeration and supervision. Point 3 is correct: The HLB Creator is a web-map application that ensures accurate boundary identification and geo-referencing. Point 4 is correct: CaaS is an initiative to ensure that the data collected is available in clean, machine-readable formats for evidence-based policymaking by government departments. Incorrect Solution: D The 2027 Census is designed as India’s first fully digital census. Point 1 is correct: Enumerators will use mobile apps for data entry, moving away from traditional paper schedules. Point 2 is correct: The CMMS will allow for real-time tracking of the progress of enumeration and supervision. Point 3 is correct: The HLB Creator is a web-map application that ensures accurate boundary identification and geo-referencing. Point 4 is correct: CaaS is an initiative to ensure that the data collected is available in clean, machine-readable formats for evidence-based policymaking by government departments.

#### 9. Question

Which of the following are the new digital features of the Census of India 2027?

• Use of Android and iOS mobile applications for data collection.

• Real-time monitoring through the Census Management & Monitoring System (CMMS).

• Geo-referencing of census blocks using a GIS-based House listing Block (HLB) Creator.

• “Census-as-a-Service” (CaaS) to provide machine-readable datasets to various ministries.

Select the correct answer using the code given below:

• (a) 1, 2 and 3 only

• (b) 2, 3 and 4 only

• (c) 1 and 4 only

• (d) 1, 2, 3 and 4

Solution: D

• The 2027 Census is designed as India’s first fully digital census.

• Point 1 is correct: Enumerators will use mobile apps for data entry, moving away from traditional paper schedules.

• Point 2 is correct: The CMMS will allow for real-time tracking of the progress of enumeration and supervision.

• Point 3 is correct: The HLB Creator is a web-map application that ensures accurate boundary identification and geo-referencing.

• Point 4 is correct: CaaS is an initiative to ensure that the data collected is available in clean, machine-readable formats for evidence-based policymaking by government departments.

Solution: D

• The 2027 Census is designed as India’s first fully digital census.

• Point 1 is correct: Enumerators will use mobile apps for data entry, moving away from traditional paper schedules.

• Point 2 is correct: The CMMS will allow for real-time tracking of the progress of enumeration and supervision.

• Point 3 is correct: The HLB Creator is a web-map application that ensures accurate boundary identification and geo-referencing.

• Point 4 is correct: CaaS is an initiative to ensure that the data collected is available in clean, machine-readable formats for evidence-based policymaking by government departments.

• Question 10 of 10 10. Question 1 points Which of the following are considered “precursor gases” for the formation of secondary pollutants? Sulfur dioxide Nitrogen oxides Ammonia Volatile Organic Compounds (VOCs) Select the correct answer using the code given below: (a) 1 and 2 only (b) 1, 2 and 4 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 Correct Solution: D Sulfur dioxide (SO₂), nitrogen oxides (NOₓ), ammonia (NH₃), and volatile organic compounds (VOCs) are all widely recognized as precursor gases because they do not merely act as pollutants by themselves but play a crucial role in the atmospheric formation of secondary pollutants. Sulfur dioxide and nitrogen oxides undergo oxidation reactions in the atmosphere to form sulfuric acid and nitric acid, which subsequently contribute to the formation of secondary particulate matter such as sulfate and nitrate aerosols (PM₂.₅). Nitrogen oxides and VOCs interact under sunlight through complex photochemical reactions to generate secondary pollutants like tropospheric ozone and photochemical smog. Ammonia, though often overlooked, is equally important because it reacts with acidic species derived from SO₂ and NOₓ to form ammonium sulfate and ammonium nitrate, significantly increasing fine particulate pollution. Incorrect Solution: D Sulfur dioxide (SO₂), nitrogen oxides (NOₓ), ammonia (NH₃), and volatile organic compounds (VOCs) are all widely recognized as precursor gases because they do not merely act as pollutants by themselves but play a crucial role in the atmospheric formation of secondary pollutants. Sulfur dioxide and nitrogen oxides undergo oxidation reactions in the atmosphere to form sulfuric acid and nitric acid, which subsequently contribute to the formation of secondary particulate matter such as sulfate and nitrate aerosols (PM₂.₅). Nitrogen oxides and VOCs interact under sunlight through complex photochemical reactions to generate secondary pollutants like tropospheric ozone and photochemical smog. Ammonia, though often overlooked, is equally important because it reacts with acidic species derived from SO₂ and NOₓ to form ammonium sulfate and ammonium nitrate, significantly increasing fine particulate pollution.

#### 10. Question

Which of the following are considered “precursor gases” for the formation of secondary pollutants?

• Sulfur dioxide

• Nitrogen oxides

• Volatile Organic Compounds (VOCs)

Select the correct answer using the code given below:

• (a) 1 and 2 only

• (b) 1, 2 and 4 only

• (c) 2, 3 and 4 only

• (d) 1, 2, 3 and 4

Solution: D

• Sulfur dioxide (SO₂), nitrogen oxides (NOₓ), ammonia (NH₃), and volatile organic compounds (VOCs) are all widely recognized as precursor gases because they do not merely act as pollutants by themselves but play a crucial role in the atmospheric formation of secondary pollutants.

• Sulfur dioxide and nitrogen oxides undergo oxidation reactions in the atmosphere to form sulfuric acid and nitric acid, which subsequently contribute to the formation of secondary particulate matter such as sulfate and nitrate aerosols (PM₂.₅).

• Nitrogen oxides and VOCs interact under sunlight through complex photochemical reactions to generate secondary pollutants like tropospheric ozone and photochemical smog.

• Ammonia, though often overlooked, is equally important because it reacts with acidic species derived from SO₂ and NOₓ to form ammonium sulfate and ammonium nitrate, significantly increasing fine particulate pollution.

Solution: D

• Nitrogen oxides and VOCs interact under sunlight through complex photochemical reactions to generate secondary pollutants like tropospheric ozone and photochemical smog.

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