Assertion :We can create a $100 %$ efficient thermos flask. Reason: Perfect vacuum is practically non-existent.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
We cannot create a 100% efficient flask. Hence the assertion is wrong. Vacuum needs to be created in the walls of the flask to prevent heat transfer due to conduction and convection. But the Perfect vacuum is practically non-existent. Hence the reason is true.

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Assertion :We can create a 100% efficient thermos flask. Reason: Perfect vacuum is practically non-existent.

Assertion :We can create a $100 %$ efficient thermos flask. Reason: Perfect vacuum is practically non-existent.