CURRENT ELECTRICITY : MCQ ON POTENTIOMETER

 

Q1 The best instrument for accurate measurement of emf of a cell is

  • a) Wheatstone bridge 
  • b) ammeter
  • c) potentiometer 
  • d) voltmeter

  • c) potentiometer 

 

Q2 The material used to make  potentiometer wire normally is 

  • a) Constantan or manganin
  • b) nickel
  • c) Copper 
  • d) zinc

  • a) Constantan or manganin

Q3  In order to achieve high accuracy the slide wire of a potentiometer should be ?

  • a) as long as possible 
  • b) as short as possible
  • c) neither to small nor too long 
  • d) very thick

  • a) as long as possible 


Q4 A potentiometer is a device for

  • a) comparing two voltages 
  • b) measuring current
  • c) comparing current 
  • d) none of the above

  • a) comparing two voltages 

Q5 A potentiometer is used to measure the emf of a cell. At null point, no current flow through..

  • a) the main circuit 
  • b) the cell circuit
  • c) both main and cell circuit 
  • d) the potentiometer wire

  • b) the cell circuit


Q6 The fall of potential per unit length of wire is called.......

  • (a) Potential difference
  • (b) Potential gradient 
  • (c) both (a) and (b)
  • (d) None of these 

  • (b) Potential gradient 

Q7 The sensitivity of a potentiometer can be increased by

  • (a) Increasing e.m.f of primary cell
  • (b) Increasing potential gradient
  • (c) Increasing length of potentiometer wire
  • (d) Decreasing length of potentiometer wire


  • (c) Increasing length of potentiometer wire


Q8 Which one of the following is a disadvantage of a potentiometer over a voltmeter?

  • (a) It can measure internal resistance of a cell
  • (b) It can measure e.m.f of a cell
  • (c) It is heavy and not portable
  • (d) It can measure very accurately small potential differences of few Microvolts.

  • c) It is heavy and not portable


Q9.  If the length of a potentiometer wire is doubled, the accuracy in determining null point will be 

  • Zero 
  • increases
  • decreases
  • No any effect

  • increases


Q10 The instrument used for  the accurate measurement of the e.m.f of cell is 

  • Wheatstone Bridge
  • Slide wire bridge
  • Potentiometer
  • None of these 

  • Potentiometer

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