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- 1. Multiple Choice
Which factor does not affect resistivity?
Length
Mass
Cross-sectional area
Temperature
- 2. Multiple Choice
The unit of resistivity is
Ω/m
Ω/m2
Ω.m
Ω.m2
- 3. Multiple Choice
The nichrome wire has a cross-sectional area of 1.3 × 10–7 m2 . Resistivity of nichrome = 1.1 × 10–6Ωm and a resistance of 53Ω. The length of the wire is
0.63m
63m
0.0063m
6.3m
- 4. Multiple Choice
A copper wire of length 2.5 m and cross-sectional area 2.4 × 10-7 m2 has a resistivity of 1.7x10-8Ωm. What is the resistance of the wire?
1.6x10-15Ω
1.0x10-14Ω
0.18Ω
5.6Ω
- 5. Multiple Choice
Resistance of a material would be equal to resistivity when
l = T
A = l
A = T
l = R
- 6. Multiple Choice
A cylindrical conductor of length l, diameter D, and resistivity ρ has a resistance R. What is the resistance of another cylindrical conductor of length l, diameter D/2 , and resistivity ρ?
8R
4R
2R
R
- 7. Multiple Choice
The equation for a material with circular cross sectional area is A=
- 8. Multiple Choice
A wire of uniform diameter 0.28mm and a length of 1.50m has a resistance of 45Ω. It's resistivity is
2.2 x 10-8Ωm
36 Ωm
1.8 x 10-6Ωm
3.4 x 10-7Ωm
- 9. Multiple Choice
Resistance is proportional to
l
A
- 10. Multiple Choice
Resistivity
changes with conditions
relies on dimensions of the material
inversely proportional to resistance
a property of the material
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