Science topic analysis
Energy & Green Technology UPSC PYQs
This cluster covers solar and hydrogen systems, batteries, electric vehicles, fuel cells, coal technologies, and scientific approaches to cleaner energy. This live collection contains 10 classified questions across 7 exam years, from 2014 to 2025.
Year-by-year frequency
Counts show how many questions in this library were assigned to the category in each represented exam year. A zero is not implied for omitted years, and frequency alone is not a prediction of a future paper.
Source topic labels in this cluster
Recurrent concept labels
Representative solved questions
The sample prioritizes different years and removes repeated prompt text. Open a question to see its options, independent answer, and explanation.
UPSC 2025 · Science
In the context of electric vehicle batteries, consider the following elements : I. Cobalt II. Graphite III. Lithium IV. Nickel How many of the above usually make up battery ca...
UPSC 2024 · Science
In the context of electric vehicle batteries, consider the following elements : 1. Cobalt 2. Graphite 3. Lithium 4. Nickel How many of the above usually make up battery cathod...
UPSC 2023 · Science
With reference to green hydrogen, consider the following statements : 1. It can be used directly as a fuel for internal combustion. 2. It can be blended with natural gas and u...
UPSC 2020 · Science
With reference to solar water pumps, consider the following statements: 1. Solar power can be used for running surface pumps and not for submersible pumps. 2. Solar power can...
UPSC 2019 · Science
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...
UPSC 2015 · Science
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 fu...
UPSC 2014 · Science
With reference to technologies for solar power production, consider the following statements : 1. 'Photovoltaics' is a technology that generates electricity by direct conversi...
UPSC 2025 · Science
Consider the following types of vehicles : I. Full battery electric vehicles II. Hydrogen fuel cell vehicles III. Fuel cell-electric hybrid vehicles How many of the above are...
UPSC 2024 · Science
Consider the following substances : 1. Ethanol 2. Nitroglycerine 3. Urea Coal gasification technology can be used in the production of how many of them?
UPSC 2024 · Science
Consider the following types of vehicles : 1. Full battery electric vehicles 2. Hydrogen fuel cell vehicles 3. Fuel cell-electric hybrid vehicles How many of the above are con...
How this page is built
Topic and concept labels are AI-assisted enrichment, not official UPSC classifications. We map them into a conservative editorial taxonomy using deterministic label rules, publish a category only when it has at least 10 questions across at least three exam years, and keep ambiguous records out of topic pages. Counts update with the question bank. See the full methodology and correction policy.