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
