Prelims Test Evening Batch 22 Oct 2026

Q1. Consider the following statements regarding Natural Gas, CNG, and LNG:

1. Compressed Natural Gas (CNG) is stored at high pressure, whereas Liquefied Natural Gas (LNG) is stored in a liquid state at cryogenic temperatures.

2. The primary component of both CNG and LNG is Methane (CH_4).

3. LNG occupies significantly less volume compared to gaseous natural gas, making it ideal for long-distance oceanic transport.

Which of the statements given above are correct?

Q2. With reference to Shale Gas, consider the following statements:

1.Shale gas is trapped inside impermeable sedimentary rock formations and requires hydraulic fracturing (fracking) for extraction.

2.India has commercially produced shale gas on a large scale in the Krishna-Godavari (KG) basin.

3.The environmental concerns associated with shale gas extraction include high water consumption and the risk of groundwater contamination.

Which of the statements given above are correct?

Q3.What does the term Research Octane Number (RON) signify in the context of automotive fuels like petrol?

Q4. Consider the following statements regarding Hydrogen Fuel Cells:

1.A hydrogen fuel cell generates electricity through an electrochemical reaction between hydrogen and oxygen, with water vapor as the primary byproduct.

2.Fuel cells produce zero tailpipe emissions, making them completely pollution-free across their entire lifecycle regardless of the hydrogen source.

3.Green hydrogen is produced via the electrolysis of water using renewable energy sources.

Which of the statements given above are correct

Q5. Regarding India’s energy transition goals, what is the targeted share of Natural Gas in India’s primary energy mix

Q6. Consider the following statements regarding Compressed Natural Gas (CNG) and Liquefied Natural Gas (LNG): 1-Natural gas is converted into LNG by cooling it to cryogenic temperatures at atmospheric pressure, reducing its volume by approximately 600 times.

2-Compressed Natural Gas (CNG) consists primarily of Methane (CH4), whereas LNG consists primarily of Propane (C3H8) and Butane (C4H10

3-LNG is stored in liquid form, making it suitable for long-distance transport via specialized cryogenic ships where pipelines are not feasible.

Which of the statements given above are correct

Q7. Consider the following statements regarding Hydrogen Fuel Cell Electric Vehicles (FCEVs):

1-FCEVs produce electricity through an electrochemical reaction between hydrogen and oxygen, emitting only water vapor and heat as tailpipe outputs.

2-Unlike Battery Electric Vehicles (BEVs), Hydrogen FCEVs rely on external electric grid charging to power their electric motors during operation.

3-Fuel cell vehicles offer significantly faster refueling times compared to the battery recharging time required for standard BEVs.

Which of the statements given above are correct?

Q8. In the context of energy classification, what distinguishes “Green Hydrogen” from “Grey Hydrogen” and “Blue Hydrogen”?

Q9. Consider the following statements regarding Coal Bed Methane (CBM):

1. CBM is an unconventional form of natural gas extracted exclusively from sandstone and shale formations rather than coal seams.

2. The primary component of CBM is methane (CH_4), which is trapped within the micropores of coal matrices primarily through adsorption.

3. India has vast CBM reserves, with commercial production currently active in states like Jharkhand and Madhya Pradesh.

Which of the statements given above are correct

Q10. With reference to Hydrogen Fuel Cell technology and its operational mechanism, consider the following statements:

1.A fuel cell uses a continuous supply of reactant (hydrogen and oxygen) to generate electrical power, meaning it does not get discharged like a conventional chemical battery.

2.Platinum or other precious metal catalysts are typically used at the electrodes (anode and cathode) to accelerate the electrochemical reactions inside the fuel cell.

3.The overall electrochemical process inside a hydrogen fuel cell produces toxic nitrogen oxides (NO_x) as a major gaseous byproduct alongside water.

Which of the statements given above are correct?