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Introduction

Assertion A: ...

Question

Assertion (A): A system is said to be closed if it can exchange energy but not matter.
Reason (R): Coffee in a stoppered thermos flask is an example of closed system.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Both Assertion and Reason are false

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Solution

The correct option is D Assertion is true but Reason is false
Closed system means no exchange of mass but there can be exchange of heat.
Thermos flask doesn't allow heat transfer along with the mass.

So, Assertion is true but Reason is false.

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