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Current Electricity MCQs for MDCAT Practice

Physics section, Current Electricity chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 1,481 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    A cell of internal resistance 2.00 Ωand electromotive force (e.m.f) 1.5V is connected to a resistor of resistance 3.00Ω. What is the potential difference across the 3.00Ω resistor?
    • 5V
    • 1.2V
    • 0.9V (correct answer)
    • 0.6V
    Correct answer: C
    Calculate terminal voltage across an external resistor in a simple circuit with internal resistance, applying Ohm's law for the entire circuit.
  2. Question 2
    A battery of 6 volts is connected to two resistors of 3 ohm and 2 ohm joined together in series. What will be the current through the circuit?
    • 6.2 A
    • 5.2 A
    • 4.2 A
    • 2.2 A
    • 1.2 A (correct answer)
    Correct answer: E
    Series resistances add directly, giving R_total = 5 Ω; applying Ohm's law, I = 6 V / 5 Ω = 1.2 A.
  3. Question 3
    The effective resistance is 6/5 ohms, when two wires are joined in parallel. When one of the wire breaks, the effective resistance is 2 ohms. The resistance of the broken wire was:
    • 3/5 ohms
    • 2 ohms
    • 6/5 ohms
    • 3 ohms (correct answer)
    Correct answer: D
    This question tests understanding of parallel and series resistance combinations and how to solve for unknown resistances when one component fails.
  4. Question 4
    Current passing through a wire decreases linearly from 40 A to Zero in 20 sec (Assuming the decrease in linear/uniform ) Calculate the total charge flowing through the wire in this interval would be:
    • 7.86C
    • 200C
    • 400C (correct answer)
    • 600C
    Correct answer: C
    Calculate total charge from a linearly decreasing current over time using the area under the current-time graph.
  5. Question 5
    When the current is drawn from a cell, its terminal potential difference and emf are
    • Different (correct answer)
    • Same
    • Both zero
    • None of them
    Correct answer: A
    A cell's terminal potential difference is always less than its EMF when current is drawn due to internal resistance.
  6. Question 6
    A 250 V bulb passes a current of 0.3 A. Calculate the power in the lamp.
    • 50 W
    • 75 W (correct answer)
    • 100 W
    • 90 W
    Correct answer: B
    Calculate electrical power using voltage and current. P = VI is the key formula for this common MDCAT physics problem.
  7. Question 7
    Kirchhoff’s current law is applicable to which type of circuits:
    • Series
    • Parallel
    • Any of these (correct answer)
    • None of these
    Correct answer: C
    Kirchhoff's Current Law (KCL) applies to junctions in ANY electrical circuit, whether series, parallel, or a combination, ensuring charge conservation.
  8. Question 8
    Voltage has the same units as that of?
    • Current
    • Magnetic induction
    • Emf (correct answer)
    • Mutual inductance
    Correct answer: C
    Voltage and Electromotive Force (EMF) share the same fundamental units, both representing energy per unit charge, a crucial concept in electrostatics and circuits.

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