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Assertion : During an adiabatic process, heat energy is not exchanged between system and its surroundings.
Reason : The temperature of a gas increases when it undergoes an adiabatic expansion.
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Reason : The temperature of a gas increases when it undergoes an adiabatic expansion.
Solution:
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Verified Answer
The correct answer is:
If the assertion is true but the reason is false.
In adiabatic process, no heat enters or leaves the system. The system is completely insulated from its surroundings. From first law of thermodynamics, change in internal energy,
$$
\Delta E=q-W=0-W=-W .
$$
Since the work is done at the expense of internal energy, therefore internal energy of the system decreases and hence temperature of the gas falls.
$$
\Delta E=q-W=0-W=-W .
$$
Since the work is done at the expense of internal energy, therefore internal energy of the system decreases and hence temperature of the gas falls.
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