Measurement and Instrumentation
Comparison methods are used

 because they take least time in measurement.
 because they are expensive.
 because they are most simple.
 when a high accuracy of measurement is required.

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Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 Both A and R are true and R is not correct explanation of A.
 A is ture and R is false.
 Both A and R are true and R is correct explanation of A.
 A is false and R is ture.

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