Electrical Resistivity and Conductivity (Series and Parallel Combinations of Resistors; Temperature Dependence of Resistance) NEET Questions

Physics - Current Electricity

Electrical Resistivity and Conductivity (Series and Parallel Combinations of Resistors; Temperature Dependence of Resistance) MCQ Questions


13.
The temperature coefficient of resistivity (Ξ±) for a metallic conductor is:
A.
Positive
B.
Imaginary
C.
Negative
D.
Zero
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ANSWER :
A. Positive
14.
The temperature coefficient of resistivity for a semiconductor is:
A.
Positive
B.
Zero
C.
Negative
D.
Infinite
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ANSWER :
C. Negative
15.
Variation of resistivity ρ with temperature T for a metal (over a limited range) is given by:
A.
ρ_T = ρ₀[1 βˆ’ Ξ±(T βˆ’ Tβ‚€)]
B.
ρ_T = ρ₀ Γ— Ξ±(T βˆ’ Tβ‚€)
C.
ρ_T = ρ₀[1 + Ξ±(T βˆ’ Tβ‚€)]
D.
ρ_T = ρ₀/(1 + Ξ±T)
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ANSWER :
C. ρ_T = ρ₀[1 + Ξ±(T βˆ’ Tβ‚€)]
16.
Resistivity of which of the following materials is the lowest at room temperature?
A.
Copper
B.
Silver
C.
Iron
D.
Aluminium
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ANSWER :
B. Silver
17.
Resistivity of which of the following is the highest?
A.
Silver
B.
Copper
C.
Glass
D.
Iron
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ANSWER :
C. Glass
18.
Manganin and constantan are used to make standard resistors because:
A.
Their temperature coefficient of resistivity is very small
B.
They have low melting point
C.
They have very high resistivity
D.
They are very cheap
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ANSWER :
A. Their temperature coefficient of resistivity is very small