MCQ On Relation Between Resistance And Length

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The relation between length and resistivity is given by the resistivity formula ρ = RA/l. Resistance is directly proportional to the length which means that any change in the length of the material will directly change its value of resistance. Relation between Resistance and Length MCQs are given as below.

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Ques. What is the formula for resistivity?

ρ = RI/A
ρ = A/lR
ρ = RA/l
ρ = R/lA

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Ans. c. ρ = RA/l

Explanation: ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l.

Ques. What has the highest resistivity?

Tungsten
Nichrome
Carbon
Nirosta

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Ans. b. Nichrome

Explanation: Nichrome has the highest resistivity and shows the heating effect of electric current because of its high resistance

Ques. What is the resistivity of copper wire?

1.72 x 10^-8 Ωm
1.72 x 10⁺⁸ Ωm
1.71 x 10^-8 Ωm
1.71 x 10⁺⁸ Ωm

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Ans. a. 1.72 x 10^-8 Ωm

Explanation: The resistivity of a particular material is measured in units of Ohm-Metres (Ωm) which is also affected by temperature.

Ques. Resistance can be described as the

opposition to voltage flow
resist rate of the voltage
opposition to current flow
current acceptability of a voltage

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Ans. c. opposition to voltage flow

Explanation: Resistance can be described as the opposition to voltage flow

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Ques. The resistance of a material is commonly affected by four factors-length, cross-sectional area, type of material and

current
voltage
type of supply
temperature

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Ans. d. temperature

Explanation: Resistance of a material is commonly affected by four factors-length, cross-sectional area, type of material and temperature

Ques. Resistivity depends on the factors

Nature and the temperature of the conductor
Nature, shape and the temperature of the conductor
Nature, shape, size and the temperature of the conductor

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Ans. a. Nature and the temperature of the conductor

Explanation: The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.

Ques. In the formula R= ρI/A, the symbol ρ stands for the

cross-sectional area of the conductor in m²
product of the length of the conductor in meters
resistivity of the material on ohm-meters
resistance of the conductor ohms per meter

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Ans. c. resistivity of the material on ohm-meters

Explanation: In the formula R= ρI/A, the symbol ρ stands for the resistivity of the material on ohm-meters.

Ques. The temperature coefficient of resistance of a material is defined as the change in

resistance per ohm per degree Celsius
temperature per degree per ohm
length per meter per ohm resistance
cross-sectional area per meter per degree Celsius

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Ans. a. resistance per ohm per degree celsius

Explanation: The temperature coefficient of resistance of a material is defined as the change in resistance per ohm per degree celsius

Ques. Which metal has the lowest resistance?

Gold
Diamond
Silver
Platinum

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Ans. c) Silver

Explanation: Element silver has the lowest resistivity and hence has higher conductivity

Ques. The resistivity of a material is defined as the:

amount of opposition to a flow of resistance through a 1-meter cube of the material
the resistance between the opposite faces of a 1-meter cube at a specified temperature
resistance of 100 meters of 1.5 mm2 copper cable at a specified temperature
the resistance between two faces of a 1 mm2 block of that material at 20 °C

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Ans. b. the resistance between the opposite faces of a 1-meter cube at a specified temperature

Explanation: The resistivity of a material is defined as the resistance between the opposite faces of a 1-meter cube at a specified temperature.

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