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QPage 12: Q3: HC Verma: Concepts of Physics - Volume 2 Heat and Temperature Page 12: Q3 Solution: A body is placed on a railway platform and an identical body in …

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistake the body’s motion for a change in its internal energy, assuming that because B moves relative to the ground its internal (thermal) energy must increase. Remember that internal energy depends only on the body’s microscopic state (e.g., temperature) and is invariant under a change of inertial reference frame; only kinetic and mechanical energies change with the observer’s frame.

A body AA is placed on a railway platform and an identical body BB in a moving train. Which of the following energies of BB are greater than those of AA, as seen from the ground?

Multiple Choice Options

  • A a) Kinetic
  • B b) Total
  • C c) Mechanical
  • D d) Internal

Step-by-Step Verified Solution

**Answer:** a), b), c) are greater for B. **Step-by-Step Explanation:** As seen from the ground, body B in a moving train has kinetic energy, total energy, and mechanical energy greater than body A on the platform. Internal energy depends only on temperature, which is the same for both. So a), b), c) are greater for B. Internal energy is the same.

All Questions in this Chapter

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