UPSC Prelims Previous Year Questions

Science & TechnologyBiology and Human PhysiologyEvolution, Classification and Biological DiversityEasy

Question details

Type:: Single choice
Skill:: Fact recall
Tags:: Cicada · Froghopper · Pond skater · Insects

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q21

The organisms “Cicada, Froghopper and Pond skater” are:

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Science & TechnologyEnergy, Nuclear and Mobility TechnologiesPower Grids, Energy Efficiency and Smart-Energy SystemsMedium

Question details

Type:: Statement based
Skill:: Concept understanding
Tags:: Distributed Energy Resources · Battery storage · Rooftop solar · Fuel cells
Related topics:: Renewable Energy and Energy Transition Solutions

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q27

Consider the following: 1. Battery storage 2. Biomass generators 3. Fuel cells 4. Rooftop solar photovoltaic units How many of the above are considered “Distributed Energy Resources”?

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Science & TechnologyPhysics and Applied PhysicsAtomic, Nuclear and Particle PhysicsHard

Question details

Type:: Statement based
Skill:: Concept understanding
Tags:: Radioisotope thermoelectric generators · Plutonium-238 · Spacecraft power

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q31

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?

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Science & TechnologySpace Science and Space ProgrammesAstronomy, Cosmology and AstrophysicsMedium

Question details

Type:: Statement relationship
Skill:: Concept understanding
Tags:: Giant stars · Dwarf stars · Stellar lifetime

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q32

Consider the following statements: Statement-I: Giant stars live much longer than dwarf stars. Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions. Which one of the following is correct in respect of the above statements?

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Science & TechnologyBiology and Human PhysiologyAnimal and Human PhysiologyMedium

Question details

Type:: Single choice
Skill:: Fact recall
Tags:: Vasodilation · Blood flow · Human physiology

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q33

Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow ?

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Science & TechnologyCommunication, Electronics and Quantum TechnologyRadar, Sonar and Remote-Sensing InstrumentsHard

Question details

Type:: Statement based
Skill:: Application
Tags:: Radar · Precipitation monitoring · Animal migration

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q34

Consider the following activities: 1. Identification of narcotics on passengers at airports or in aircraft 2. Monitoring of precipitation 3. Tracking the migration of animals In how many of the above activities can the radars be used?

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Science & TechnologyDefence and Strategic TechnologiesMilitary Aviation, UAVs and Aerospace PlatformsMedium

Question details

Type:: Statement based
Skill:: Fact recall
Tags:: Fighter generations · Rafael · MiG-29 · Tejas MK-1

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q35

Consider the following aircraft: 1. Rafael 2. MiG-29 3. Tejas MK-1 How many of the above are considered fifth generation fighter aircraft?

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Science & TechnologyChemistry and Materials SciencePolymers, Plastics and ElastomersHard

Question details

Type:: Statement based
Skill:: Application
Tags:: Hydrogels · Drug delivery · Polymer applications

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q36

In which of the following are hydrogels used ? 1. Controlled drug delivery in patients 2. Mobile air-conditioning systems 3. Preparation of industrial lubricants Select the correct answer using the code given below:

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Science & TechnologyEnergy, Nuclear and Mobility TechnologiesHydrogen Production, Storage and Fuel CellsEasy

Question details

Type:: Single choice
Skill:: Concept understanding
Tags:: Hydrogen fuel cells · Fuel Cell Electric Vehicles · Exhaust emissions
Related topics:: Electric, Hybrid, Fuel-Cell and Alternative Vehicles

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q37

Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?

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Science & TechnologyEnergy, Nuclear and Mobility TechnologiesPower Grids, Energy Efficiency and Smart-Energy SystemsEasy

Question details

Type:: Single choice
Skill:: Concept understanding
Tags:: Pumped-storage hydropower · Energy storage · Power grids

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q38

Recently, the term “pumped-storage hydropower” is actually and appropriately discussed in the context of which one of the following?

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Science & TechnologyComputing, AI and Digital TechnologiesData Systems, Cloud and Edge ComputingEasy

Question details

Type:: Single choice
Skill:: Concept understanding
Tags:: Metaverse · Virtual worlds · Interoperability

Classification and difficulty are editorial labels. Explanations are awaiting review.

2024 · Q48

Which one of the following words/phrases is most appropriately used to denote “an interoperable network of 3D virtual worlds that can be accessed simultaneously by millions of users, who can exert property rights over virtual items”?

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Themes in Science & Technology· 11

PYQs on Science & Technology

Prelims 2024

Science & Technology

Themes in Science & Technology· 11

PYQs on Science & Technology

Prelims 2024

Prelims 2024, question 21: Evolution, Classification and Biological Diversity

Prelims 2024, question 27: Power Grids, Energy Efficiency and Smart-Energy Systems

Prelims 2024, question 31: Atomic, Nuclear and Particle Physics

Prelims 2024, question 32: Astronomy, Cosmology and Astrophysics

Prelims 2024, question 33: Animal and Human Physiology

Prelims 2024, question 34: Radar, Sonar and Remote-Sensing Instruments

Prelims 2024, question 35: Military Aviation, UAVs and Aerospace Platforms

Prelims 2024, question 36: Polymers, Plastics and Elastomers

Prelims 2024, question 37: Hydrogen Production, Storage and Fuel Cells

Prelims 2024, question 38: Power Grids, Energy Efficiency and Smart-Energy Systems

Prelims 2024, question 48: Data Systems, Cloud and Edge Computing