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Electricity & Magnetism - Resistance MCQs

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Electricity & Magnetism - Resistance

Electricity & Magnetism - Resistance MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
For most metals, resistance usually does what as temperature rises?
A. Decreases to zero in all cases
B. Becomes negative
C. Increases
D. Never changes
Correct Answer: C
Lattice vibrations increase with temperature, impeding electron flow.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
What material property appears in R = ρL/A?
A. Magnetic field only
B. Resistivity
C. Density only
D. Capacitance
Correct Answer: B
Resistivity ρ characterizes how strongly a material resists current.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
For a uniform wire, increasing cross-sectional area generally does what to resistance?
A. Makes it infinite
B. Has no effect
C. Increases it
D. Decreases it
Correct Answer: D
R = ρL/A, so larger area reduces resistance.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
For a uniform wire, increasing its length generally does what to resistance?
A. Has no effect
B. Increases it
C. Decreases it to zero
D. Makes resistance negative
Correct Answer: B
For fixed material and area, R is proportional to length.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
What is the SI unit of resistance?
A. Ampere
B. Watt
C. Ohm
D. Volt
Correct Answer: C
The ohm is the SI derived unit of resistance.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Resistance
What is electrical resistance?
A. Rate of charge flow
B. Magnetic flux only
C. Opposition a material offers to electric current
D. Energy per unit charge
Correct Answer: C
Resistance quantifies how strongly a component opposes current.
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