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

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Measurement and Instrumentation
The measurement of a quantity

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

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