Science & Technology - UPSC Mains Previous Year Questions
Get UPSC Mains Previous Year Question (PYQ) papers with detailed model answers, diagrams, flowcharts, and structured answer writing for GS 1, 2, 3, Ethics and Essay - all at one place.
- Science & Technology15 MarksView Answer for: What is agentic Artificial Intelligence (AI)? Explain its working. Describe its applications with suitable examples. Discuss the advantages, risks and challenges associated with agentic AI systems.
What is agentic Artificial Intelligence (AI)? Explain its working. Describe its applications with suitable examples. Discuss the advantages, risks and challenges associated with agentic AI systems.
- Science & Technology15 MarksView Answer for: Mention the salient features of 'Mission Drishti'. Discuss the imaging techniques used in the satellite launched on 3rd May 2026. Why is it being considered the world's first satellite of its kind?
Mention the salient features of 'Mission Drishti'. Discuss the imaging techniques used in the satellite launched on 3rd May 2026. Why is it being considered the world's first satellite of its kind?
- Science & Technology10 MarksView Answer for: Distinguish between a Fast Breeder Reactor (FBR) and a thermal nuclear reactor. In the context of the first indigenously developed prototype FBR at Kalpakkam, explain the term 'criticality'. What are its implications for the clean energy future of our country?
Distinguish between a Fast Breeder Reactor (FBR) and a thermal nuclear reactor. In the context of the first indigenously developed prototype FBR at Kalpakkam, explain the term 'criticality'. What are its implications for the clean energy future of our country?
- Science & Technology10 MarksView Answer for: Explain by giving two examples, how biotechnology has helped Indian farmers in processing their perishable crops.
Explain by giving two examples, how biotechnology has helped Indian farmers in processing their perishable crops.
- Science & Technology15 MarksView Answer for: India aims to become a semiconductor manufacturing hub. What are the challenges faced by the semiconductor industry in India? Mention the salient features of the India Semiconductor Mission.
India aims to become a semiconductor manufacturing hub. What are the challenges faced by the semiconductor industry in India? Mention the salient features of the India Semiconductor Mission.
- Science & Technology15 MarksView Answer for: How does nanotechnology offer significant advancements in the field of agriculture? How can this technology help to uplift the socio-economic status of farmers?
How does nanotechnology offer significant advancements in the field of agriculture? How can this technology help to uplift the socio-economic status of farmers?
- Science & Technology10 MarksView Answer for: What is Carbon Capture, Utilization and Storage (CCUS)? What is the potential role of CCUS in tackling climate change?
What is Carbon Capture, Utilization and Storage (CCUS)? What is the potential role of CCUS in tackling climate change?
- Science & Technology10 MarksView Answer for: How can India achieve energy independence through clean technology by 2047? How can biotechnology play a crucial role in this endeavour?
How can India achieve energy independence through clean technology by 2047? How can biotechnology play a crucial role in this endeavour?
- Science & Technology10 MarksView Answer for: The fusion energy programme in India has steadily evolved over the past few decades. Mention India’s contributions to the international fusion energy project – International Thermonuclear Experimental Reactor (ITER). What will be the implications of the success of this project for the future of global energy?
The fusion energy programme in India has steadily evolved over the past few decades. Mention India’s contributions to the international fusion energy project – International Thermonuclear Experimental Reactor (ITER). What will be the implications of the success of this project for the future of global energy?
- Science & Technology15 MarksView Answer for: What are asteroids? How real is the threat of them causing extinction of life? What strategies have been developed to prevent such a catastrophe?
What are asteroids? How real is the threat of them causing extinction of life? What strategies have been developed to prevent such a catastrophe?
- Science & Technology10 MarksView Answer for: What is the technology being employed for electronic toll collection on highways? What are its advantages and limitations? What are the proposed changes that will make this process seamless? Would this transition carry any potential hazards?
What is the technology being employed for electronic toll collection on highways? What are its advantages and limitations? What are the proposed changes that will make this process seamless? Would this transition carry any potential hazards?
- Science & Technology10 MarksView Answer for: What is the present world scenario of intellectual property rights with respect to life materials? Although India is second in the world to file patents, still only a few have been commercialized. Explain the reasons behind this less commercialization.
What is the present world scenario of intellectual property rights with respect to life materials? Although India is second in the world to file patents, still only a few have been commercialized. Explain the reasons behind this less commercialization.
- Science & Technology15 MarksView Answer for: What is the main task of India’s third moon mission which could not be achieved in its earlier mission? List the countries that have achieved this task. Introduce the subsystems in the spacecraft launched and explain the role of the ‘Virtual Launch Control Centre’ at the Vikram Sarabhai Space Centre which contributed to the successful launch from Sriharikota.
What is the main task of India’s third moon mission which could not be achieved in its earlier mission? List the countries that have achieved this task. Introduce the subsystems in the spacecraft launched and explain the role of the ‘Virtual Launch Control Centre’ at the Vikram Sarabhai Space Centre which contributed to the successful launch from Sriharikota.
- Science & Technology10 MarksView Answer for: Discuss several ways in which microorganisms can help in meeting the current fuel shortage.
Discuss several ways in which microorganisms can help in meeting the current fuel shortage.
- Science & Technology10 MarksView Answer for: Introduce the concept of Artificial Intelligence (AI). How does AI help clinical diagnosis? Do you perceive any threat to privacy of the individual in the use of AI in the healthcare?
Introduce the concept of Artificial Intelligence (AI). How does AI help clinical diagnosis? Do you perceive any threat to privacy of the individual in the use of AI in the healthcare?
- Science & Technology15 MarksView Answer for: What is the basic principle behind vaccine development? How do vaccines work? What approaches were adopted by the Indian vaccine manufacturers to produce COVID-19 vaccines ?
What is the basic principle behind vaccine development? How do vaccines work? What approaches were adopted by the Indian vaccine manufacturers to produce COVID-19 vaccines ?
- Science & Technology15 MarksView Answer for: Launched on 25th December, 2021, James Webb Space Telescope has been much in the news since then. What are its unique features which make it superior to its predecessor Space Telescopes ? What are the key goals of this mission ? What potential benefits does it hold for the human race?
Launched on 25th December, 2021, James Webb Space Telescope has been much in the news since then. What are its unique features which make it superior to its predecessor Space Telescopes ? What are the key goals of this mission ? What potential benefits does it hold for the human race?
- Science & Technology10 MarksView Answer for: Each year a large amount of plant material, cellulose, is deposited on the surface of Planet Earth. What are the natural processes this cellulose undergoes before yielding carbon dioxide, water and other end products ?
Each year a large amount of plant material, cellulose, is deposited on the surface of Planet Earth. What are the natural processes this cellulose undergoes before yielding carbon dioxide, water and other end products ?
- Science & Technology15 MarksView Answer for: The Nobel Prize in Physics of 2014 was jointly awarded to Akasaki, Amano and Nakamura for the invention of Blue LEDs in the 1990s. How has this invention impacted the everyday life of human beings ?
The Nobel Prize in Physics of 2014 was jointly awarded to Akasaki, Amano and Nakamura for the invention of Blue LEDs in the 1990s. How has this invention impacted the everyday life of human beings ?
- Science & Technology15 MarksView Answer for: What are the research and developmental achievements in applied biotechnology? How will these achievements help to uplift the poorer sections of the society?
What are the research and developmental achievements in applied biotechnology? How will these achievements help to uplift the poorer sections of the society?
- Science & Technology15 MarksView Answer for: COVID-19 pandemic has caused unprecedented devastation worldwide. However, technological advancements are being availed readily to win over the crisis. Give an account of how technology was sought to aid management of the pandemic.
COVID-19 pandemic has caused unprecedented devastation worldwide. However, technological advancements are being availed readily to win over the crisis. Give an account of how technology was sought to aid management of the pandemic.
- Science & Technology10 MarksView Answer for: How is science interwoven deeply with our lives? What are the striking changes in agriculture triggered by science-based technologies?
How is science interwoven deeply with our lives? What are the striking changes in agriculture triggered by science-based technologies?
- Science & Technology10 MarksView Answer for: What do you understand about nanotechnology and how is it helping in the health sector?
What do you understand about nanotechnology and how is it helping in the health sector?
- Science & Technology15 MarksView Answer for: How can biotechnology help to improve the living standards of farmers?
How can biotechnology help to improve the living standards of farmers?
- Science & Technology10 MarksView Answer for: What is India’s plan to have its space station and how will it benefit our space programme?
What is India’s plan to have its space station
and how will it benefit our space programme? - Science & Technology15 MarksView Answer for: Why is there so much activity in the field of biotechnology in our country? How has this activity benefitted the field of biopharma?
Why is there so much activity in the field of biotechnology in our country? How has this activity benefitted the field of biopharma?
- Science & Technology10 MarksView Answer for: Discuss the work of ‘Bose-Einstein Statistics’ done by Prof. Satyendra Nath Bose and show how it revolutionised the field of Physics.
Discuss the work of ‘Bose-Einstein Statistics’ done by Prof. Satyendra Nath Bose and show how it revolutionised the field of Physics.
- Science & Technology15 MarksView Answer for: Give an account of the growth and development of nuclear science and technology in India. What is the advantage of the fast breeder reactor programme inIndia?
Give an account of the growth and development of nuclear science and technology in India. What is the advantage of the fast breeder reactor programme inIndia?
- Science & Technology10 MarksView Answer for: India has achieved remarkable successs in unmanned space missions including the Chandrayaan and Mars Orbiter Mission, but has not ventured into manned space missions, both in terms of technology and logistics? Explain critically
India has achieved remarkable successs in unmanned space missions including the Chandrayaan and Mars Orbiter Mission, but has not ventured into manned space missions, both in terms of technology and logistics? Explain critically
- Science & Technology10 MarksView Answer for: Stem cell therapy is gaining popularity in India to treat a wide variety of medical conditions including leukaemia, Thalassemia, damaged cornea and several burns. Describe briefly what stem cell therapy is and what advantages it has over other treatments?
Stem cell therapy is gaining popularity in India to treat a wide variety of medical conditions including leukaemia, Thalassemia, damaged cornea and several burns. Describe briefly what stem cell therapy is and what advantages it has over other treatments?
- Science & Technology12.5 MarksView Answer for: Why is nanotechnology one of the key technologies of the 21st century? Describe the salient features of the Indian Government’s Mission on Nanoscience and Technology and the scope of its application in the development process of the country.
Why is nanotechnology one of the key
technologies of the 21st century?
Describe the salient features of the
Indian Government’s Mission on
Nanoscience and Technology and the
scope of its application in the
development process of the country. - Science & Technology12.5 MarksView Answer for: Discuss India’s achievements in the field of Space Science and Technology. How the application of this technology has helped India in its socio-economic development?
Discuss India’s achievements in the
field of Space Science and Technology.
How the application of this technology
has helped India in its socio-economic
development? - Science & Technology12.5 MarksView Answer for: Give an account of the current status and the targets to be achieved pertaining to renewable energy sources in the country. Discuss in brief the importance of the National Programme on Light Emitting Diodes (LEDs).
Give an account of the current status
and the targets to be achieved
pertaining to renewable energy sources
in the country. Discuss in brief the
importance of the National Programme
on Light Emitting Diodes (LEDs). - Science & Technology12.5 MarksView Answer for: India’s Traditional Knowledge Digital Library (TKDL) which has a database containing formatted information on more than 2 million medicinal formulations is proving a powerful weapon in the country's fight against erroneous patents. Discuss the pros and cons of making the database publicly available under open source licensing.
India’s Traditional Knowledge Digital Library (TKDL) which has a database containing formatted information on more than 2 million medicinal formulations is proving a powerful weapon in the country's fight against erroneous patents. Discuss the pros and cons of making the database publicly available under open source licensing.
- Science & Technology12.5 MarksView Answer for: Discuss the advantage and security implication of cloud hosting of servers vis-a-vis in house machine based hosting for government business.
Discuss the advantage and security implication of cloud hosting of servers vis-a-vis in house machine based hosting for government business.
- Science & Technology12.5 MarksView Answer for: What are the areas of prohibitive labour that can be sustainably managed by robots? Discuss the initiatives that can propel the research in premier research institutes for substantive and gainful innovation.
What are the areas of prohibitive labour that can be sustainably managed by robots? Discuss the initiatives that can propel the research in premier research institutes for substantive and gainful innovation.
- Science & Technology12.5 MarksView Answer for: What do you understand about “Standard Positioning System” and “Precision positioning system” in the GPS era? Discuss the advantage India perceives from its ambitious IRNSS programme employing just seven satellites.
What do you understand about “Standard Positioning System” and “Precision positioning system” in the GPS era? Discuss the advantage India perceives from its ambitious IRNSS programme employing just seven satellites.
- Science & Technology12.5 MarksView Answer for: Can overuse and free availability of antibiotics without Doctor’s prescription, be contributors to the emergence of drug-resistant diseases in India? What are the available mechanisms for monitoring and control? Critically discuss the various issues involved.
Can overuse and free availability of antibiotics without Doctor’s prescription, be contributors to the emergence of drug-resistant diseases in India? What are the available mechanisms for monitoring and control? Critically discuss the various issues involved.
- Science & Technology12.5 MarksView Answer for: Scientific research in Indian universities is declining, because a career in science is not as attractive as business professions, engineering or administration, and the universities are becoming consumer-oriented. Critically comment.
Scientific research in Indian universities is declining, because a career in science is not as attractive as business professions, engineering or administration, and the universities are becoming consumer-oriented. Critically comment.
- Science & Technology10 MarksView Answer for: What are social networking site and what security implications do these sites present?
What are social networking site and what security implications do these sites present?
- Science & Technology5 MarksView Answer for: What do you understand by a run-of-the-ride hydroelectricity project? How is it different from any other hydroelectricity project?
What do you understand by a run-of-the-ride hydroelectricity project? How is it different from any other hydroelectricity project?
- Science & Technology5 MarksView Answer for: What is an FRP composite material? How are they manufactured? Discuss their applications in the aviation and automobile industry
What is an FRP composite material? How are they manufactured? Discuss their applications in the aviation and automobile industry
- Science & Technology5 MarksView Answer for: How does the 3D printing technology work? List out the advantages and disadvantages of the technology.
How does the 3D printing technology work? List out the advantages and disadvantages of the technology.
- Science & Technology5 MarksView Answer for: What is a digital signature? What does its authentication mean? Giver various salient built-in features of a digital signature.
What is a digital signature? What does its authentication mean? Giver various salient built-in features of a digital signature.
- Science & Technology10 MarksView Answer for: What do you understand by the Umpire decision review in cricket? Discuss its various components. Explain how silicon tape on the edge of a bat may fool the system.
What do you understand by the Umpire decision review in cricket? Discuss its various components. Explain how silicon tape on the edge of a bat may fool the system.
- Science & Technology10 MarksView Answer for: What do you understand by fixed-dose drug combinations (FDCs)? Discuss their merits and demerits.
What do you understand by fixed-dose drug combinations (FDCs)? Discuss their merits and demerits.
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