## Labels

### 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