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11. thermodynamics — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics11. thermodynamics1 Mark
MCQ
$Assertion :$ In an isolated system the entropy increases.
$Reason :$ The processes in an isolated system are adiabatic.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • ✓
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: B.
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
b
In an unisolated system, heat may enter into or escape from the system due to which entropy may increase or decrease but for isolated system we do not consider exchange of heat, so, in this case entropy will always increase as the process is spontaneous. An adiabatic process involves no exchange of heat. We also define isolated system as having no exchange of heat with the surrounding so it process in an isolated system are adibatic. The two statements are independently correct but not co-related.

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