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

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

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

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