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Indian Navy Pilot Thermodynamics — practice questions

Explore 6 free Thermodynamics questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Thermodynamics questions and exercises with answers

Showing questions 1–6 of 6.

The first law of thermodynamics is mathematically expressed as:Read the answer and worked solution →For an ideal gas, Cp − Cv equals:Read the answer and worked solution →In a cyclic process, ΔU equals:Read the answer and worked solution →For polytropic process PV^n = constant, n = 0 means:Read the answer and worked solution →n-type or p-type?Read the answer and worked solution →True or false: semiconductorsRead the answer and worked solution →

Worked practice questions

The first law of thermodynamics is mathematically expressed as:

  1. $dQ = dU + dW$
  2. $dQ = dU - dW$
  3. $dU = dQ \cdot dW$
  4. $dQ \cdot dU = dW$
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Correct answer: A. $dQ = dU + dW$

The first law states that heat $dQ$ supplied to a system goes into changing its internal energy $dU$ plus doing work $dW$ on the surroundings. So $dQ = dU + dW$. It is just energy conservation applied to thermodynamic systems.

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For an ideal gas, Cp − Cv equals:

  1. R
  2. 2R
  3. R/2
  4. 0
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Correct answer: A. R

**Mayer's relation:** Cp - Cv = R (universal gas constant). This holds exactly for ideal gases.

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In a cyclic process, ΔU equals:

  1. 0 (returns to initial state)
  2. Q
  3. ΔS
  4. W
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Correct answer: A. 0 (returns to initial state)

In a cyclic process, the system returns to its initial state. So ΔU = 0 (since U is a state function). **Therefore Q = W (net heat absorbed = net work done by system).**

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