1. Ohm’s Law states that:
A. Current is proportional to resistance.
B. Voltage is proportional to resistance.
C. Current is proportional to voltage.
D. Power is proportional to voltage.
Answer: C. Current is proportional to voltage.
2. The mathematical expression for Ohm’s Law is:
A. I=V×RI = V \times R
B. V=I×RV = I \times R
C. R=V×IR = V \times I
D. P=I2RP = I^2 R
Answer: B. V=I×RV = I \times R
3. If the resistance of a circuit is doubled and the voltage remains constant, the current will:
A. Double
B. Remain the same
C. Halve
D. Increase fourfold
Answer: C. Halve
4. A resistor has a resistance of 10 Ω10 \, \Omega. If a 5 A5 \, \text{A} current flows through it, the voltage across the resistor is:
A. 5 V5 \, \text{V}
B. 10 V10 \, \text{V}
C. 50 V50 \, \text{V}
D. 100 V100 \, \text{V}
Answer: C. 50 V50 \, \text{V}
5. The unit of resistance is:
A. Volt
B. Ohm
C. Ampere
D. Watt
Answer: B. Ohm
Kirchhoff’s Laws MCQs
6. Kirchhoff’s Current Law (KCL) states that:
A. The total current entering a junction equals the total current leaving the junction.
B. The sum of all currents in a loop is zero.
C. The current is inversely proportional to resistance.
D. The total current is proportional to voltage.
Answer: A. The total current entering a junction equals the total current leaving the junction.
7. Kirchhoff’s Voltage Law (KVL) states that:
A. The total voltage in a circuit is equal to zero.
B. The sum of all voltages around a closed loop equals zero.
C. Voltage is directly proportional to resistance.
D. Voltage and current are inversely proportional.
Answer: B. The sum of all voltages around a closed loop equals zero.
8. In Kirchhoff’s Voltage Law (KVL), the algebraic sum of potential differences in a closed loop is zero because:
A. Energy is conserved.
B. Charge is conserved.
C. Voltage is constant.
D. Current is constant.
Answer: A. Energy is conserved.
9. Kirchhoff’s Current Law (KCL) is based on the principle of:
A. Conservation of energy
B. Conservation of charge
C. Conservation of mass
D. Conservation of momentum
Answer: B. Conservation of charge
10. If three currents I1=2 AI_1 = 2 \, \text{A}, I2=3 AI_2 = 3 \, \text{A}, and I3=1 AI_3 = 1 \, \text{A} enter a junction, the current leaving the junction is:
A. 6 A6 \, \text{A}
B. 2 A2 \, \text{A}
C. 1 A1 \, \text{A}
D. 0 A0 \, \text{A}
Answer: A. 6 A6 \, \text{A}