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Energy & Environment

49 questions in Science & Technology.

Asked in 2026, 2025, 2024, 2023, 2021, 2020, 2019, 2018, 2017, 2016, 2015, 2014, 2012, 2011

2026 · Q70Science & TechnologyEnergy & Environmentmoderate

Which of the following statements with regard to Green Hydrogen is/are correct ? 1. It is decarbonized hydrogen obtained from natural gas reforming combined with carbon capture and storage (CCS). 2. It is produced using electrolysis of water with electricity generated by renewable energy. 3. National Green Hydrogen Mission of India aims for abatement of nearly 50 MMT of annual greenhouse gas emissions by 2030. Select the answer using the code given below :

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)2 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2024 · Q31Science & TechnologyEnergy & Environmentmoderate

With reference to radioisotope thermoelectric generators (RTGs), consider the following statements : 1. RTGs are miniature fission reactors. 2. RTGs are used for powering the onboard systems of spacecrafts. 3. RTGs can use Plutonium-238, which is a by-product of weapons development. Which of the statements given above are correct ?

  1. (a)1 and 2 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2023 · Q55Science & TechnologyEnergy & Environmentmoderate

With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements : 1. Biofilters provide waste treatment by removing uneaten fish feed. 2. Biofilters convert ammonia present in fish waste to nitrate. 3. Biofilters increase phosphorus as nutrient for fish in water. How many of the statements given above are correct?

  1. (a)Only one
  2. (b)Only two
  3. (c)All three
  4. (d)None
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Official answer(b) Only two

2021 · Q72Science & TechnologyEnergy & Environmentmoderate

With reference to street-lighting, how do sodium lamps differ from LED lamps? 1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps. 2. As street-lights, sodium lamps have longer life span than LED lamps. 3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting. Select the correct answer using the code given below.

  1. (a)3 only
  2. (b)2 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(c) 1 and 3 only

2020 · Q55Science & TechnologyEnergy & Environmentmoderate

In India, why are some nuclear reactors kept under “IAEA Safeguards” while others are not ?

  1. (a)Some use uranium and others use thorium
  2. (b)Some use imported uranium and others use domestic supplies
  3. (c)Some are operated by foreign enterprises and others are operated by domestic enterprises
  4. (d)Some are State-owned and others are privately-owned
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Official answer(b) Some use imported uranium and others use domestic supplies

2019 · Q43Science & TechnologyEnergy & Environmentmoderate

In the context of proposals to the use of hydrogen-enriched CNG (H-CNG) as fuel for buses in public transport, consider the following statements : 1. The main advantage of the use of H-CNG is the elimination of carbon monoxide emissions. 2. H-CNG as fuel reduces carbon dioxide and hydrocarbon emissions. 3. Hydrogen up to one-fifth by volume can be blended with CNG as fuel for buses. 4. H-CNG makes the fuel less expensive than CNG. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)4 only
  4. (d)1, 2, 3 and 4
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Official answer(d) 1, 2, 3 and 4

2018 · Q7Science & TechnologyEnergy & Environmentmoderate

What is/are the consequence/consequences of a country becoming the member of the 'Nuclear Suppliers Group' ? 1. It will have access to the latest and most efficient nuclear technologies. 2. It automatically becomes a member of "The Treaty on the Non-Proliferation of Nuclear Weapons (NPT)". Which of the statements given above is/are correct ?

  1. (a)1 only
  2. (b)2 only
  3. (c)Both 1 and 2
  4. (d)Neither 1 nor 2
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Official answer(a) 1 only

2018 · Q33Science & TechnologyEnergy & Environmentmoderate

In the Indian context, what is the implication of ratifying the 'Additional Protocol' with the 'International Atomic Energy Agency (IAEA)' ?

  1. (a)The civilian nuclear reactors come under IAEA safeguards.
  2. (b)The military nuclear installations come under the inspection of IAEA.
  3. (c)The country will have the privilege to buy uranium from the Nuclear Suppliers Group (NSG).
  4. (d)The country automatically becomes a member of the NSG.
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Official answer(a) The civilian nuclear reactors come under IAEA safeguards.

2017 · Q22Science & TechnologyEnergy & Environmentmoderate

It is possible to produce algae based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry ? 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 :

  1. (a)1 and 2 only
  2. (b)2 and 3 only
  3. (c)3 only
  4. (d)1, 2 and 3
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Official answer(b) 2 and 3 only

2016 · Q79Science & TechnologyEnergy & Environmenteasy

India is an important member of the 'International Thermonuclear Experimental Reactor'. If this experiment succeeds, what is the immediate advantage for India?

  1. (a)It can use thorium in place of uranium for power generation
  2. (b)It can attain a global role in satellite navigation
  3. (c)It can drastically improve the efficiency of its fission reactors in power generation
  4. (d)It can build fusion reactors for power generation
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Official answer(d) It can build fusion reactors for power generation

2015 · Q95Science & TechnologyEnergy & Environmentmoderate

With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements : 1. If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products. 2. Fuel cells can be used for powering buildings and not for small devices like laptop computers. 3. Fuel cells produce electricity in the form of Alternating Current (AC). Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(a) 1 only

2014 · Q7Science & TechnologyEnergy & Environmentmoderate

With reference to technologies for solar power production, consider the following statements : 1. 'Photovoltaics' is a technology that generates electricity by direct conversion of light into electricity, while 'Solar Thermal' is a technology that utilizes the Sun's rays to generate heat which is further used in electricity generation process. 2. Photovoltaics generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC). 3. India has manufacturing base for Solar Thermal technology, but not for Photovoltaics. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1, 2 and 3
  4. (d)None
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Official answer(a) 1 only

2014 · Q40Science & TechnologyEnergy & Environmentmoderate

In India, cluster bean (Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which one of the following statements is correct in this context?

  1. (a)The oil extracted from seeds is used in the manufacture of biodegradable plastics
  2. (b)The gum made from its seeds is used in the extraction of shale gas
  3. (c)The leaf extract of this plant has the properties of anti-histamines
  4. (d)It is a source of high quality biodiesel
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Official answer(b) The gum made from its seeds is used in the extraction of shale gas

2012 · Q13Science & TechnologyEnergy & Environmenteasy

What is the role of ultraviolet (UV) radiation in the water purification systems? 1. It inactivates/kills the harmful microorganisms in water. 2. It removes all the undesirable odours from the water. 3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(a) 1 only

2012 · Q61Science & TechnologyEnergy & Environmentmoderate

To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium? 1. Thorium is far more abundant in nature than uranium. 2. On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium. 3. Thorium produces less harmful waste compared to uranium. Which of the statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(d) 1, 2 and 3

2011 · Q7Science & TechnologyEnergy & Environmentmoderate

Microbial fuel cells are considered a source of sustainable energy. Why? 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 statements given above is/are correct?

  1. (a)1 only
  2. (b)2 and 3 only
  3. (c)1 and 3 only
  4. (d)1, 2 and 3
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Official answer(c) 1 and 3 only