Question:
Given below are two statements:
Assertion (A): When air is compressed slowly at STP, there is no change in its temperature.
Reason (R): The process is adiabatic, in adiabatic process there is no change in temperature.
Given below are two statements:
Assertion (A): When air is compressed slowly at STP, there is no change in its temperature.
Reason (R): The process is adiabatic, in adiabatic process there is no change in temperature.
Assertion (A): When air is compressed slowly at STP, there is no change in its temperature.
Reason (R): The process is adiabatic, in adiabatic process there is no change in temperature.
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Adiabatic means no heat exchange. It does not mean constant temperature.
Updated On: May 19, 2026
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is not the correct explanation of A
- A is correct but R is not correct
- A is not correct but R is correct
Show Solution
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The Correct Option is C
Solution and Explanation
Concept:
Slow compression generally allows heat exchange with surroundings and may behave nearly isothermally. Adiabatic process means no heat exchange, not no temperature change.
Step 1: Check Assertion.
When air is compressed slowly, heat can escape to surroundings. Therefore, temperature may remain nearly constant. \[ A \text{ is correct} \]
Step 2: Check Reason.
The reason says that in an adiabatic process there is no change in temperature. This is wrong. In adiabatic compression, temperature generally increases. \[ R \text{ is not correct} \]
Step 3: Final conclusion.
Assertion is correct but Reason is incorrect. \[ \therefore \text{Correct Answer is (C)} \]
Slow compression generally allows heat exchange with surroundings and may behave nearly isothermally. Adiabatic process means no heat exchange, not no temperature change.
Step 1: Check Assertion.
When air is compressed slowly, heat can escape to surroundings. Therefore, temperature may remain nearly constant. \[ A \text{ is correct} \]
Step 2: Check Reason.
The reason says that in an adiabatic process there is no change in temperature. This is wrong. In adiabatic compression, temperature generally increases. \[ R \text{ is not correct} \]
Step 3: Final conclusion.
Assertion is correct but Reason is incorrect. \[ \therefore \text{Correct Answer is (C)} \]
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