CURRENT ELECTRICTY: MCQ ON CURRENT ELECTRICITY PART 2

 


Q1 What is the effect of rise of temperature on the resistivity of semiconductors?

  • No effect
  • Resistivity increased
  • Resistivity decreased
  • First resistivity increased than decreased

  • Resistivity decreased
  • resistivity of semiconductors decreases  with rise in temperature


Q2 What is the nature of temperature coefficient of resistivity for conductors.

  • Always positive
  • Always negative
  • May have positive or negative value
  • Always perfectly zero

  • Always positive


Q3 Which of the following is the unit of resistivity 

  • Ohm meter
  • Ohm `m^{2}`
  • Ohm
  • None of these

  • Ohm meter

(Use formula resistivity  = Rx L/a  )


Q4 Current density is a..........quantity.

  • Scalar 
  • Vector 
  • tensor
  • None of these

  • Vector


Q5 Which of the following has highest value of resistivity

  • Metals 
  • Non metals
  • Alloys
  •  None of these

  • Alloys

Q6 Resistivity of alloy Manganin increases rapidly with increase in temperature (T/F) 

  • True
  • True

  • False

Q7 Which of following is not a unit of conductance?

  • Siemens 
  • `ohm^{-1}`
  • ohm 
  •  mho


  • ohm 
  • Ohm is the unit of resistance.

Q8 A wire of resistivity is stretched to double its original length its new resistivity will

  • Increase
  • Decreases
  • May Increase or decrease 
  • Remain same 

  • Remain same 


Q9 The specific resistance of a material depends on

  • Length of the conductor 
  • area of cross section of the conductor
  • both length and area of conductor 
  • temperature of the material

  • temperature of the material


Q10 Conductance is the inverse of electrical resistance. (True/False)

  • True
  • False

  • True 



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