Measurement and Instrumentation
A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

 0.0012 Ohm.
 240 Ohm.
 0.0024 Ohm.
 120 Ohm.

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

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

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