Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured as I1 = 150 ± 1A , I2 = 250 ± 2A, where the limits of error are as standard deviations. I is measured as

 (400 ± 2.24) A
 (400 ± 3) A
 (400 ± 1) A
 (400 ± 1.5) A

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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.

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

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