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

 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
 A is false bur R is true

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Measurement and Instrumentation
A resistance of 105 ohms is specified using significant figures as indicated below : 1. 105 ohms 2. 105.0 ohms 3. 0.000105 mega ohms Among these,

 2 represents greater precision but 1 and 3 represent same precision.
 1, 2 and 3 represent same precision.
 2 and 3 represent greater precision than 1.
 1 represents greater precision than 2 and 3.

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