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Question

Which one among the following has the least coefficient of thermal conductivity ?

This question was previously asked in
CDS 2 2026 Maths Question Paper (13-Sep-2026)
The correct answer is

\(H_2\) 

To determine which among the given options has the least coefficient of thermal conductivity, let's first understand the concept of thermal conductivity.

Thermal Conductivity: It is a property of a material that indicates its ability to conduct heat. Materials with high thermal conductivity transfer heat more efficiently than those with low thermal conductivity.

The options given are:

  • \(H_2O\) (Water)
  • \(H_2\) (Hydrogen)
  • \(Cu\) (Copper)
  • \(Al\) (Aluminum)

Thermal Conductivity Values:

  • \(Cu\) (Copper) - Approximately 401 W/mK
  • \(Al\) (Aluminum) - Approximately 237 W/mK
  • \(H_2O\) (Water) - Approximately 0.6 W/mK
  • \(H_2\) (Hydrogen) - Approximately 0.180 W/mK

From these values, it is clear that \(H_2\) (Hydrogen) has the least coefficient of thermal conductivity among the given options.

Conclusion: The correct answer is \(H_2\) because it has the lowest thermal conductivity, meaning it is the least effective at conducting heat compared to the other substances listed.

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