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,

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

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Measurement and Instrumentation
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

  It does not load the circuit at all.
 It loads the circuit to maximum extent.
 It uses centre zero galvanometer instead of voltmeter.
 It loads the circuit moderately.

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