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NEET Physics Thermodynamics 2026 NEET 2026 (Re-NEET)

NEET Physics Question (2026) — Solution

Question

In an adiabatic expansion, the temperature of one mole of an ideal monatomic gas ( =5/3) decreases from 60K to 50K. The work done by the gas in the process is : (Take the universal gas constant as R=8.3 J mol^ -1 K^ -1 )

Options

  1. A. 166 J
  2. B. 41.5 J
  3. C. 83 J
  4. D. 124.5 J

Answer

D. 124.5 J

Step-by-step solution

The work done by an ideal gas in an adiabatic process is given by the formula: W = nR(T_1 - T_2) - 1 Given values are: n = 1 mole R = 8.3 J mol^ -1 K^ -1 T_1 = 60 K T_2 = 50 K = 5 3 Substituting these values into the formula: W = 1 8.3 (60 - 50) 5 3 - 1 W = 8.3 10 2 3 W = 83 3 2 W = 249 2 = 124.5 J Answer: 124.5 J

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