Measurement and Instrumentation
The measurement of a quantity

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

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Measurement and Instrumentation
If an inductance L is connected in one arm of bridge and resistance R1, R2, R3 in other three arms

 The bridge is balanced for some specified value of frequency.
 The bridge can not be balanced.
 The bridge is balanced for some specified value of R1, R2, R3.
 The bridge can be balanced.

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