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Electricity & Magnetism - Ohm's Law MCQs

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Electricity & Magnetism - Ohm's Law

Electricity & Magnetism - Ohm's Law MCQs With Answers

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CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
Which SI unit measures resistance?
A. Coulomb
B. Ampere
C. Volt
D. Ohm
Correct Answer: D
Resistance is measured in ohms, symbol Ω.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
If voltage stays constant and resistance doubles, current does what?
A. Doubles
B. Stays exactly the same
C. Halves
D. Becomes zero always
Correct Answer: C
From I = V/R, doubling R halves I.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
If I = 2 A and R = 5 Ω, what voltage is required?
A. 7 V
B. 0.4 V
C. 2.5 V
D. 10 V
Correct Answer: D
Using V = IR gives 2×5 = 10 V.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
If V = 12 V and R = 4 Ω, what current flows?
A. 0.33 A
B. 8 A
C. 3 A
D. 48 A
Correct Answer: C
Using I = V/R gives 12/4 = 3 A.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
Which equation represents Ohm's law?
A. F = ma
B. V = IR
C. P = VI only
D. Q = It only
Correct Answer: B
Ohm's law relates potential difference, current and resistance.
CSS - PMS - CCE - PCS - General Science Electricity & Magnetism - Ohm's Law
What does Ohm's law state for an ohmic conductor at constant physical conditions?
A. Resistance is always zero
B. Current is proportional to resistance
C. Voltage is proportional to current
D. Power is independent of voltage
Correct Answer: C
For an ohmic conductor, V = IR.
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