Assertion :kilogram is a standard unit of mass. Reason: kilogram is well defined and invariant.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Assertion statement is correct that kilogram is a standard unit of mass.
A unit is said to be a standard unit if it is easily measurable and doesnot change with space and time.
Thus kilogram is a standard unit as it can be easily measured and invariant.
Hence option A is correct.

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