Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It loads the circuit moderately.
 It loads the circuit to maximum extent.
 It uses centre zero galvanometer instead of voltmeter.

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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 possible to standardize before a measurement is undertaken.
  It is based on null balance technique.
 None of above.

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