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QPage 12: Q4: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Page 12: Q4 Solution: In which of the following pairs of temperature scales, the size …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistake the mercury‑in‑glass thermometer scale for the Celsius scale, assuming their degree sizes are identical; in fact the mercury scale is based on the physical expansion of mercury and is not defined to have exactly 100 equal divisions between ice and steam. The ideal‑gas scale does share Celsius’s 100‑degree interval (same degree size) but has a different zero, and the Kelvin (absolute) scale inherits the same degree size as Celsius. Always separate the size of a degree (interval) from the position of the zero point when comparing temperature scales.

In which of the following pairs of temperature scales, the size of a degree is identical?

Multiple Choice Options

  • A a) Mercury scale and ideal gas scale
  • B b) Celsius scale and mercury scale
  • C c) Celsius scale and ideal gas scale
  • D d) Ideal gas scale and absolute scale

Step-by-Step Verified Solution

**Answer:** c), d). **Step-by-Step Explanation:** The size of a degree is identical for the Celsius scale and the ideal gas scale (both have 100 degrees between ice point and steam point). The ideal gas scale and the absolute (Kelvin) scale also have identical degree size. Mercury scale is not necessarily identical to the ideal gas scale. So c) and d) are correct.

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