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.
 None of above.
 It is possible to standardize before a measurement is undertaken.

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

 Period measurment modes only.
 Frequency measurment modes only.
 Frequency and period measurment modes, respectively.
  Period and frequency measurement modes respectively.

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