Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Resistance of connecting leads.
 Contact resistance.
 All of above.
 Thermoelectric emfs.

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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.

 A is false bur R is true
 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 true but R is false

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