Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Thermoelectric emfs.
 All of above.
 Resistance of connecting leads.
 Contact resistance.

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Measurement and Instrumentation
The measurement of a quantity

 none of these.
 is a comparison of an unknown quantity with known quantity.
  is a comparison of an unknown quantity with standard.
 is a comparison of an unknown quantity with another quantity.

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