Physics
ASSERTION

In the measurement of physical quantities direct and indirect methods are used.

REASON

The accuracy and precision of measuring instruments along with errors in measurements should be taken into account, while expressing the result.

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

SOLUTION
Direct measurement refers to directly measuring the quantity for which the experiment is performed while indirect measurement means first measuring some primary quantities and then using them to calculate the required quantity. It has no relation to accuracy and precision.
Accuracy must be taken into account to know the closeness of result to actual value while precision is required to get the correlation between different values which are observed in repeatedly performing an experiment.
Hence both statements are correct but second one does not explain first.

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Assertion & Reason Medium Published on 18th 08, 2020
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