Measurement and Instrumentation
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 0.5%
 1.5%
 1%
 1.2%

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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,

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