Current Electricity MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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The charge on an electron is:
A. 1.6 × 10⁻¹⁹ Coulombs
B. 1.6 × 10¹⁹ Coulombs
C. 9.1 × 10⁻³¹ kilograms
D. 9.1 × 10³¹ kilograms
Answer: 1.6 × 10⁻¹⁹ Coulombs
The equivalent resistance of resistors in series is:
A. R_eq = R1 + R2 + R3 + …
B. R_eq = 1 / (1/R1 + 1/R2 + 1/R3 + …)
C. R_eq = R1 × R2 × R3 × …
D. R_eq = (R1 + R2) / (1 + R3)
Answer: R_eq = R1 + R2 + R3 + …
In a circuit, if the resistance is halved and the voltage remains constant, the current:
A. Doubles
B. Halves
C. Remains the same
D. Quadruples
Answer: Doubles
The electrical energy consumed by a device is equal to:
A. The product of power and time
B. The sum of the resistances
C. The product of current and resistance
D. The product of voltage and resistance
Answer: The product of power and time
The resistance of a conductor depends on all of the following except:
A. Material
B. Length
C. Cross-sectional area
D. Current
Answer: Current
In a parallel circuit, the voltage across each resistor is:
A. The same
B. Different
C. The sum of the voltages
D. The average voltage
Answer: The same
The Kirchoff’s Voltage Law states that:
A. The sum of the electromotive forces (emf) in any closed loop is equal to the sum of the potential drops
B. The sum of currents entering a junction equals the sum of currents leaving the junction
C. The total resistance in a series circuit equals the sum of the resistances
D. The total power in a circuit equals the product of voltage and current
Answer: The sum of the electromotive forces (emf) in any closed loop is equal to the sum of the potential drops
The unit of electrical charge is the:
A. Coulomb
B. Joule
C. Volt
D. Ohm
Answer: Coulomb
The time constant of an RC circuit is given by:
A. τ = R × C
B. τ = R / C
C. τ = C / R
D. τ = R + C
Answer: τ = R × C