Measurement and Instrumentation
A bridge circuit is shown in the figure below. Which one of the sentence given below is most suitable for balancing the bridge?

 First adjust R4 and then adjust R2.
 First adjust R2 and then adjust R3.
 First adjust R4 and then adjust R1.
 First adjust R2 and then adjust R4.

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

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

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