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Physics 10 Chapter 14 - Current and Electricity - 17
1.
If we double the cross-section of the wire, what will be the effect on its resistance?
a) Resistance will be halved
b) Resistance will be decrease 3 times
c) Resistance will be doubled
d) Resistance will be increase 3 times
2.
If we half the cross-section of the wire, what will be the effect on its resistance?
a) Resistance will be halved
b) Resistance will be decrease 3 times
c) Resistance will be increase 3 times
d) Resistance will be doubled
3.
Which of the following relation is correct about resistance of the wire?
a) R ∞ A / L
b) R ∞ L x A
c) R ∞ 1 / L
d) R ∞ L / A
4.
Which of the following relation is correct about resistance of the wire?
a) R = ρ A / L
b) R = ρ L / A
c) R = ρ L x A
d) R = 1 / L ρ
5.
What is ‘ρ’ in the formula, “R = ρ L / A” called?
a) Potential difference
b) Current constant
c) Specific resistance
d) Heat capacity
6.
What is the resistance of one metre cube of a substance called?
a) Specific resistance
b) Current constant
c) Heat capacity
d) Potential difference
7.
What is the unit for specific resistance?
a) Ohm
b) Ohm-metre
c) Volt
d) Joule
8.
If the length of copper wire is 1 m and its diameter is 2 mm, then find the resistance of this copper wire?
a) R = 0.54 x 10
2
b) R = 0.54 x 10
1
c) R = 0.54 x 10
-1
d) R = 0.54 x 10
-2
9.
Why diamond does not conduct electricity?
a) Because it has no free electrons
b) Because it has free protons
c) Because it has no free protons
d) Because it has free electrons
10.
What is the symbol for specific resistance?
a) Symbol: R
b) Symbol: Ω
c) Symbol: Ώ
d) Symbol: ρ
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