Measurement and Instrumentation
The measurement of a quantity

  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with known quantity.
 is a comparison of an unknown quantity with another quantity.
 none of these.

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

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