Last Updated on November 5, 2025 by Admin
2025 Prelims PYQs
1] Consider the following types of vehicles: [2025/A-41]
I. Full battery electric vehicles
II. Hydrogen fuel cell vehicles
III. Fuel cell electric hybrid vehicles
How many of the above are considered as alternative (powertrain) vehicles?
a) Only one
b) Only two
c) All the three
d) None
Show Answer
Ans: c) All the three
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2] Consider the following statements: [2025/A-63]
Statement I: Of the two major ethanol producers in the world, i.e., Brazil and the United States of America, the former produces more ethanol than the latter.
Statement II: Unlike in the United States of America where corn is the principal feedstock for ethanol production, sugarcane is the principal feedstock for ethanol production in Brazil.
Which of the statements given above are correct?
a) Both Statement I and Statement II are correct and Statement II explains Statement I
b) Both Statement I and Statement II are correct but Statement II does not explain Statement I
c) Statement I is correct but Statement II is not correct
d) Statement I is not correct but Statement II is correct
Show Answer
Ans: d) Statement I is not correct but Statement II is correct
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3] Consider the following statements about ‘PM Surya Ghar Muft Bijli Yojana’: [2025/A-70]
I. It targets installation of one crore solar rooftop panels in the residential sector.
II. The Ministry of New and Renewable Energy aims to impart training on installation, operation, maintenance and repairs of solar rooftop systems at grassroot levels.
III. It aims to create more than three lakhs skilled manpower through fresh skilling, and up-skilling, under scheme component of capacity building.
Which of the statements given above are correct?
a) I and II only
b) I and III only
c) II and III only
d) I, II and III
Show Answer
Ans: d) I, II and III
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2024 Prelims PYQs
1] Consider the following: [2024]
1. Battery storage
2. Biomass generators
3. Fuel cells
4. Rooftop solar photovoltaic units
How many’ of the above are considered “Distributed Energy Resources”?
a) Only one
b) Only two
c) Only three
d) All four
Show Answer
Ans: d) All four
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2] Consider the following materials: [2024]
1. Agricultural residues
2. Corn grain
3. Wastewater treatment sludge
4. Wood mill waste
Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?
a) 1 and 2 only
b) 3 and 4 only
c) 1, 2, 3 and 4
d)1, 3 and 4 only
Show Answer
Ans: c) 1, 2, 3 and 4
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3] One of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen? [2024]
a) Hydrogen peroxide
b) Hydronium
c) Oxygen
d) Water Vapour
Show Answer
Ans: d) Water Vapour
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4] Recently, the term “pumped-storage hydropower” is actually and appropriately discussed in the context of which one of the following? [2024]
a) Irrigation of terraced crop fields
b) Lift irrigation of cereal crops
c) Long duration energy storage
d) Rainwater harvesting system
Show Answer
Ans: c) Long duration energy storage
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2023 Prelims PYQs
1] With reference to green hydrogen, consider the following statements: [2023]
1. It can be used directly as a fuel for internal combustion.
2. It can be blended with natural gas and used as fuel for heat or power generation.
3. It can be used in the hydrogen fuel cell to run vehicles.
How many of the above statements are correct?
a) Only one b) Only two
c) All three d) None
Show Answer
Ans: c) All three
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2] Consider the following heavy industries: [2023]
1. Fertilizer plants
2. Oil refineries
3. Steel plants
Green hydrogen is expected to play a significant role in decarbonizing how many of the above industries?
a) Only one b) Only two
c) All three d) None
Show Answer
Ans: c) All three
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2022 Prelims PYQs
1] Consider the following statements: [2022]
1. Gujarat has the largest solar park in India.
2. Kerala has a fully solar powered International Airport.
3. Goa has the largest floating solar photovoltaic project in India.
Which of the statements given below is/are correct?
a) 1 and 2
b) 2 only
c) 1 and 3
d) 3 only
Show Answer
Ans: b) 2 only
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2020 Prelims PYQs
1] According to India’s National Policy on Biofuels, which of the following can be used as raw materials for the production of biofuels? [2020]
1. Cassava
2. Damaged wheat grains
3. Groundnut seeds
4. Horse gram
5. Rotten potatoes
6. Sugar beet
Select the correct answer using the code given below:
a) 1, 2, 5 and 6 only
b) 1, 3, 4 and 6 only
c) 2, 3, 4 and 5 only
d) 1, 2, 3, 4, 5 and 6
Show Answer
Ans: a) 1, 2, 5 and 6 only
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2] With reference to solar water pumps, consider the following statements: [2020]
1. Solar power can be used for running surface pumps and not for submersible pumps.
2. Solar power can be used for running centrifugal pumps and not the ones with piston.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2
Show Answer
Ans: d) Neither 1 nor 2
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2017 Prelims PYQs
1] It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry? [2017]
1. Production of algae based biofuels is possible in seas only and not on continents.
2. Setting up and engineering the algae based biofuel production requires high level of expertise/technology until the construction is completed.
3. Economically viable production necessitates the setting up of large scale facilities which may raise ecological and social concerns.
Select the correct answer using the code given below:
a) 1 and 2 only
b) 2 and 3 only
c) 3 only
d) 1, 2 and 3
Show Answer
Ans: b) 2 and 3 only
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2015 Prelims PYQs
1] With reference to the Indian Renewable Energy Development Agency Limited (IREDA), which of the following statements is/are correct? [2015]
1. It is a Public Limited Government Company.
2. It is a Non ‘ Banking Financial Company.
Select the correct answer using the code given below.
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 or 2
Show Answer
Ans: c) Both 1 and 2
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2012 Prelims PYQs
1] Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statements is/are correct? [2012]
1. Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
2. The combustible gases generated from biomass gasification consist of hydrogen and carbon dioxide only.
3. The combustible gases generated from biomass gasification can be used for direct heat generation but not in internal combustion engines.
Select the correct answer using the codes given below:
a) 1 Only b) 2 & 3 Only
c) 1 & 3 Only d) 1,2 & 3
Show Answer
Ans: a) 1 Only
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2011 Prelims PYQs
1] Microbial fuel cells are considered a source of sustainable energy. Why? [2011]
1. They use living organisms as catalysts to generate electricity from certain substrates.
2. They use a variety of inorganic materials as substrates.
3. They can be installed in waste water treatment plants to cleanse water and produce electricity.
Which of the following statements given above is/ are correct?
a) 1 only b) 2 and 3 only
c) 1 and 3 only d) 1,2, and 3
Show Answer
Ans: c) 1 and 3 only
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2010-2008 Prelims PYQs
1] Given below are the names of four energy crops. Which one of them can be cultivated for ethanol? [2010]
a) Jatropha b) Maize
c) Pongania d) Sunflower
Show Answer
Ans: b) Maize
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2] Other than Jatropha curcas, why is Pongamia pinnata also considered a good option for the production of bio – diesel in India? [2010]
1. Pongamia Pinnata grows naturally in most of the arid regions of India.
2. The seeds of Pongamia pinnata are rich in lipid content of which nearly half is oleic acid.
Which of the statements given above is/are correct?
a) 1 only b) 2 only
c) Both 1 and 2 d) Neither 1 nor 2
Show Answer
Ans: c) Both 1 and 2
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3] In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from: [2009]
a) Potato b)Rice
c) Sugarcane d) Wheat
Show Answer
Ans: c) Sugarcane
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4] Which one of the following Union Ministries is implementing the Biodiesel Mission (as Noida Ministry)? [2008]
a) Ministry of Agriculture
b) Ministry of Science and Technology
c) Ministry of New and Renewable Energy
d) Ministry of Rural Development
Show Answer
Ans: c) Ministry of New and Renewable Energy
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Thank you so much❤
You’re Welcome Rishi.Stay tuned.
2023/Q2. Green hydrogen can play a role in decarbonizing all of the mentioned heavy industries: fertilizer plants, oil refineries, and steel plants.
Fertilizer Plants: Fertilizer production is energy-intensive and often relies on fossil fuels, particularly natural gas. By using green hydrogen as a clean energy source, fertilizer plants can reduce their carbon emissions. Green hydrogen can be used to generate electricity or directly as a feedstock in the ammonia production process, which is a key component of fertilizer manufacturing.
Oil Refineries: Oil refineries are major contributors to greenhouse gas emissions due to their energy-intensive processes and reliance on fossil fuels. Green hydrogen can be utilized in oil refineries to replace or supplement fossil fuels, reducing their carbon footprint. Hydrogen can be used in refining processes, such as hydrocracking and hydrotreating, to remove impurities and improve the quality of fuels.
Steel Plants: The steel industry is responsible for a significant amount of global carbon emissions. Green hydrogen can be used as a reducing agent in the steelmaking process, replacing coal or coke. This process, known as direct reduction, enables the production of “green” or low-carbon steel. Additionally, green hydrogen can be utilized in the steel industry for heat generation and electricity production, further reducing carbon emissions.
Source: https://www.iberdrola.com/sustainability/green-
Thank you for taking trouble to explain the answer Ashwin. Yes, what you’ve mentioned makes sense. Green hydrogen can be used in all these 3 places, and the answer should be c) All three. We’ve made the necessary changes. Your contribution is definitely helping us create an error free website. Best Wishes!
Q.1(2023) Answer would be all three..
Green hydrogen can be used directly as a fuel for internal combustion by a hydrogen engine (HCE). HCE is an engine that uses hydrogen (H2) as fuel. It is a modified gasoline-powered engine but doesn’t emit any carbon-based pollution, which is a big benefit towards carbon neutrality. HCEs operate similarly to 4-stroke gasoline engines (ICEs). But compared to gasoline, which has an octane rating of 90 (for premium gasoline), hydrogen has a higher-octane number of 130. So, statement 1 is correct.
Hydrogen produced through clean pathways can be injected into natural gas pipelines, and the resulting blends can be used to generate heat and power with lower emissions than using natural gas alone. So, statement 2 is correct.
A fuel cell uses the chemical energy of green hydrogen or other fuels to cleanly and efficiently produce electricity. If hydrogen is the fuel, the only products are electricity, water, and heat. So, statement 3 is correct.
Yes you’re absolutely correct Sumit. We’ve changed the answer of Q1.2023 from only two to all three.
Thank you!
q4 ministry is ministry of renewable energy
Last question, ministry of new and renew energy should be the answer.
Yes Akshat. We’ve made the correction and also added additional information. Do check out.