Measurement and Instrumentation
Comparison methods are used

 when a high accuracy of measurement is required.
 because they are most simple.
 because they are expensive.
 because they take least time in measurement.

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Measurement and Instrumentation
The measurement of a quantity

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

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