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
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 1, 2 and 3 represent same precision.
 2 represents greater precision but 1 and 3 represent same precision.
 1 represents greater precision than 2 and 3.
 2 and 3 represent greater precision than 1.

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