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

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Measurement and Instrumentation
A DC potentiometer is the best means available for the measurement of DC voltage because

 The precision in measurment is independent of the type of the defector used.
  It is based on null balance technique.
 It is possible to standardize before a measurement is undertaken.
 None of above.

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