Prelims Previous Year Questions
UPSC CSE 2025
Question:
Q.1) Consider the following substances:
1. Ethanol
2. Nitroglycerine
3. Urea
Coal gasification technology can be used in the production of how many of them?
A) Only one
B) Only two
C) All the three
D) None
Answer: B
CAPF / Economics / 2024
Question:
Q.2) Which one among the following statements about the Singareni Collieries Company Limited is correct?
A) Located at Kothagudem in Telangana, this is the first and the oldest coal mining company in India in the private sector
B) It has now diversified into thermal and solar power generation, explosive manufacturing for blasting in opencast mines and consultancy works
C) It has been conferred with ‘Navratna’ status since 2011
D) It is the single largest coal producing company in the world
Answer: B
IAS / Geography / 2023
Question:
Q.3) Consider the following statements:
Statement-I: India, despite having uranium deposits, depends on coal for most of its electricity production.
Statement-II: Uranium, enriched to the extent, of at least 60%, is required for the production of electricity.
Which one of the following is correct in respect of the above statements?
A) Both Statement-I and Statement-II are correct and Statement-II is the correct explanation for Statement-I
B) Both Statement-I and Statement-II are correct and Statement-II is not the correct explanation for Statement-I
C) Statement-I is correct but Statement-II is incorrect
D) Statement-I is incorrect but Statement-II is correct
Answer: C
CDS-I / Science & Technology / 2023
Question:
Q.4) Consider the following statements and identify the correct answer using the code given below:
1) In a thermal power station, fuels such as oil, coal, or natural gas are used to generate electricity.
2) Fuels are burned to heat water and turn it into steam, which goes through a turbine, which spins and turns, generating electricity.
Options:
A) Statement 1 is correct but statement 2 is not correct
B) Statement 2 is correct but statement 1 is not correct
C) Both the statements are correct and statement 2 explains statement 1
D) Both the statements are correct but statement 2 does not explain statement 1
Answer: C
IAS / Environment / 2023
Q.5) With reference to coal-based thermal power plants in India, consider the following statements:
1. None of them uses seawater.
2. None of them is set up in water-stressed district.
3. None of them is privately owned.
How many of the above statements are correct?
A) Only one
B) Only two
C) All three
D) None
Answer: D
IAS / Geography / 2023
Q.6) Which one of the following is the first and the oldest Government-owned coal mining company in India?
A) Neyveli Lignite Corporation
B) Singareni Collieries Company Limited
C) Coal India Limited
D) Mahanadi Coalfields Limited
Answer: B
UPSC 2023
Q.7) 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 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
Answer: C
Explanation:
Green Hydrogen (GH2) is hydrogen produced using renewable energy (like solar, wind) through water electrolysis. It is a clean fuel as its only by-product is water.
- Direct fuel for internal combustion – Hydrogen can be burned directly in modified internal combustion engines (ICEs) as an alternative to petrol/diesel. Hence, statement 1 is correct.
- Blended with natural gas – Hydrogen can be mixed with natural gas (up to certain limits, e.g., 10–20%) and used in existing pipelines for power generation or industrial heating. Hence, statement 2 is correct.
- Hydrogen fuel cells – Hydrogen is the primary fuel in Proton Exchange Membrane (PEM) fuel cells, which generate electricity to run electric motors in vehicles. Toyota’s Mirai and IndianOil’s hydrogen buses are examples. Hence, statement 3 is correct.
Therefore, all three statements are correct.
