Assertion :When we change the unit of measurement of a quantity, its numerical value changes Reason: Smaller the unit of measurement smaller is its numerical value

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 C Assertion is correct but Reason is incorrect
Assertion is correct that changing the unit of measurement changes the numerical value of the quantity.
For example, let the mass of the body to be $1$ $k g$ .
Its mass in cgs unit, $m = 1 k g \times \frac{1000 g}{k g} = 1000$ $g$
Hence the numerical value of the mass gets changed.
Also, we see that smaller the unit of measurement, greater is its numerical value.
Thus reason is incorrect.

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