Measurement and Instrumentation
Assertion (A): A hot wire ammeter has a cramped scale. Reason (R): The heat is proportional to square of current.

 Both A and R are true and R is correct explanation of A.
 A is false and R is ture.
 Both A and R are true and R is not correct explanation of A.
 A is ture and R is false.

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

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Measurement and Instrumentation
Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

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

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