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

 It is possible to standardize before a measurement is undertaken.
  It is based on null balance technique.
 The precision in measurment is independent of the type of the defector used.
 None of above.

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

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