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

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

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

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