Current Electricity MCQs | STS IBA FPSC BPSC SPSC PPSC Mcqs Test Preparation
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In a circuit with both resistors and capacitors, the impedance is:
A. The combination of resistance and reactance
B. Only the resistance
C. Only the reactance
D. None of the above
Answer: The combination of resistance and reactance
In a series circuit with a constant current, the power dissipated across each resistor:
A. Depends on the value of the resistor
B. Is the same for all resistors
C. Is inversely proportional to the resistance
D. Is independent of the resistance
Answer: Depends on the value of the resistor
The equivalent resistance of a parallel circuit is always:
A. Less than the smallest individual resistance
B. Equal to the largest individual resistance
C. Greater than the largest individual resistance
D. Equal to the sum of the resistances
Answer: Less than the smallest individual resistance
The electric field in a conductor is:
A. Proportional to the current
B. Inversely proportional to the resistance
C. Zero if the conductor is in equilibrium
D. None of the above
Answer: Zero if the conductor is in equilibrium
In an electrical circuit, if the voltage across a resistor is doubled, the current through it:
A. Doubles
B. Halves
C. Remains the same
D. Quadruples
Answer: Doubles
The unit of electric power is the:
A. Joule
B. Watt
C. Ohm
D. Ampere
Answer: Watt
The current through a conductor is:
A. The rate of flow of electric charge
B. The rate of change of voltage
C. The rate of change of resistance
D. The rate of change of power
Answer: The rate of flow of electric charge
The electric power consumed by a device is:
A. P = I² × R
B. P = V / R
C. P = V / I
D. P = R / I
Answer: P = I² × R
Kirchhoff’s first law (current law) states that:
A. The algebraic sum of currents entering a junction equals zero
B. The sum of the voltage drops in a closed loop equals zero
C. The sum of the resistances in a series circuit equals the total resistance
D. The power supplied to a circuit equals the power dissipated
Answer: The algebraic sum of currents entering a junction equals zero