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QPage 61: Q9: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 61: Q9 Solution: A gas is contained in a metallic cylinder fitted with a piston. …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the pressure remains constant after a sudden compression because the volume is fixed, ignoring that the metallic cylinder allows heat to dissipate. You must recognize that the initial adiabatic spike in pressure is followed by a decrease as the gas cools to ambient temperature.

A gas is contained in a metallic cylinder fitted with a piston. The piston is suddenly moved in to compress the gas and is maintained at this position. As time passes the pressure of the gas in the cylinder ____________.

Multiple Choice Options

  • A increases
  • B decreases
  • C remains constant
  • D increases or decreases depending on the nature of the gas

Step-by-Step Verified Solution

**Answer:** (b) decreases. **Step-by-Step Explanation:** The cylinder is metallic (conducting). After compression, heat flows out to the surroundings, so the gas cools, and pressure decreases.

All Questions in this Chapter

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