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NEET Physics Thermodynamics 2026 NEET 2026 (Re-NEET)

NEET Physics Question (2026) — Solution

Question

One mole of an ideal monatomic gas undergoes a cyclic process as shown in the figure. The total heat supplied to the gas is :

Options

  1. A. 800 J
  2. B. 400 J
  3. C. 500 J
  4. D. 600 J

Answer

D. 600 J

Step-by-step solution

For a complete cyclic process, the change in internal energy is zero, i.e., U = 0. According to the first law of thermodynamics, Q = U + W. Therefore, the net heat supplied to the gas is equal to the net work done by the gas: Q = W. The net work done W is given by the area enclosed by the cycle on the P-V diagram. W = Area of rectangle abcd W = (P_a - P_d) (V_b - V_a) W = (300 - 100) (5 - 2) W = 200 3 = 600 J Thus, the total heat supplied to the gas is 600 J . Answer: 600 J

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