Measurement and Instrumentation
A set of independent current measurements taken by four observers was recorded as : 117.02 mA, 117.11 mA, 117.08 mA and 117.03 mA. What is the range of error ?

 ± 0.056
 ± 0.054
 ± 0.045
 ± 0.065

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

 Both A and R are true but R is NOT the correct explanation of A
 A is true but R is false
 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
Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

 It loads the circuit to maximum extent.
 It uses centre zero galvanometer instead of voltmeter.
  It does not load the circuit at all.
 It loads the circuit moderately.

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