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Assertion: In adiabatic expansion, tempe...

Assertion: In adiabatic expansion, temperature of gas always decreases.
Reason: In adiabatic process exchange of heat is zero.

A

(a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.

B

(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C

(c) If Assertion is true, but the Reason is false.

D

(d) If Assertion is false but the Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
`Q=0`, `DeltaU=-W`
In expansion, W is positive. So, `DeltaU` is negative. Hence, T also decreases.
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Knowledge Check

  • In an adiabatic expansion

    A
    `/_|U=0`
    B
    `/_\U`=negative
    C
    `/_\U`=positive
    D
    `/_\W`=zero

  • In adiabatic expansion of a gas

    A
    Its pressure increases
    B
    Its density increases
    C
    Its thermal energy increases
    D
    Its thermal energy increase

  • Assertion In adiabatic expansion the product of p and V always decreses Reason In adiabatic expansion process, wrok is done by the gas at the cost of internal energy of gas.

    A
    Both assertion and reson are true and reason is the correct explanation of assertion
    B
    Both assetion and reason are true but reason is not the correct explanation of assertion
    C
    Assertion is true but reason is false
    D
    Both assetion and reason are flase

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