Measurement and Instrumentation
In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

 5.0 mm/Ω
 2.5 mm/Ω
 0.8 mm/Ω
 0.4 mm/Ω

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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.
 None of above.
  It is based on null balance technique.
 The precision in measurment is independent of the type of the defector used.

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