Verified Solution • 2025–26 Session moderate

QPages 11-12: Q4: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Pages 11-12: Q4 Solution: For a constant-volume gas thermometer, one should fill the gas at

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often pick high temperature‑low pressure, recalling the ideal‑gas condition, and overlook that a constant‑volume gas thermometer must use low pressure to stay near‑ideal and a temperature low enough to keep the gas from liquefying within the calibration range.

For a constant-volume gas thermometer, one should fill the gas at

Multiple Choice Options

  • A low temperature and low pressure
  • B low temperature and high pressure
  • C high temperature and low pressure
  • D high temperature and high pressure

Step-by-Step Verified Solution

**Answer:** (a) low temperature and low pressure. **Step-by-Step Explanation:** For a constant-volume gas thermometer to behave ideally, the gas should be at low pressure (so intermolecular forces are negligible) and low temperature (so the gas doesn't liquify). Actually, the ideal gas behaviour is best at high temperature and low pressure. However, for a gas thermometer, the gas must not liquefy, so low temperature is preferred for accuracy in the calibration range. Standard answer: low temperature and low pressure.

All Questions in this Chapter

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