Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

 Both A and R are true but R is NOT the correct explanation of A
 A is true but R is false
 A is false bur R is true
 Both A and R are true and R is the correct explanation of A

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

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

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