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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Measurement and Instrumentation
Assertion (A) : It is always desirable to take the reading of an indicating instrument very close to the full scale reading. Reason (R) : Accuracy of an indicating instrument is maximum at the full scale deflection and error increases as reading comes closer to the beginning of the scale.

 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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