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

 None of above.
 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.

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Measurement and Instrumentation
The measurement of a quantity

 none of these.
 is a comparison of an unknown quantity with another quantity.
 is a comparison of an unknown quantity with known quantity.
  is a comparison of an unknown quantity with standard.

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