Measurement and Instrumentation
Assertion (A) : It is always desirable to take the reading of an indicating instrument very close to the full scale reading. Reason (R) : Accuracy of an indicating instrument is maximum at the full scale deflection and error increases as reading comes closer to the beginning of the scale.

 A is false bur R is true
 A is true but R is false
 Both A and R are true but R is NOT the correct explanation of A
 Both A and R are true and R is the correct explanation of A

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Measurement and Instrumentation
The measurment of very low and very high frequencies is invariably done using a frequency counter in which one of the following?

  Period and frequency measurement modes respectively.
 Frequency measurment modes only.
 Period measurment modes only.
 Frequency and period measurment modes, respectively.

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