Measurement and Instrumentation
When a potentiometer is used for measurement of voltage of an unknown source, the power consumed in the circuit of the unknown source under null condition is

 high.
 small.
 ideally zero.
 very high.

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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?

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

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