Question

In a cyclic process the internal energy of a gas
a) increase
b) remains constant
c) decrease
d) become Zero​

Answer 1

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•Increase : Heat added to the system increases the internal energy. Heat removed from the system decreases the internal energy. In a cyclic process the system returns to its initial state and so the internal energy is not changed. The heat added to the system equals the work done by the system.

•Remains constant : In an isothermal process, the temperature of the ideal gas remains constant. In a cyclic process, the initial and final temperatures (states) are the same. The internal energy of the gas is a function of temperature, hence if the temperature of initial and final states is the same.

•Decrease : Heat added to the system increases the internal energy. Heat removed from the system decreases the internal energy. In a cyclic process the system returns to its initial state and so the internal energy is not changed. The heat added to the system equals the work done by the system.

•Become zero : The internal energy does not become zero for any system except at the Absolute Zero of temperature. ... But by returning after each completed cycle to the original state, that guarantees the system returns to the initial temperature. And the internal energy of an ideal gas only depends on its temperature.

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