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}