MHT CET 2025 Physics question
Heat is given to an ideal gas in an isothermal process. Then A. internal energy of the gas will decrease. B. internal energy of the gas will increase. C. internal energy of the gas will not change. D. the gas will do negative work.
Answer: (B)
Solution
For an ideal gas the internal energy depends only on temperature, . In an isothermal process the temperature is constant, so and the internal energy does not change; statement C is correct. By the first law, $Q = Δ U
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