Current Electricity MCQs for MDCAT Practice

Physics section, Current Electricity chapter. Sample questions from past PMC papers.

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?
   • A.5V
   • B.1.2V
   • C.0.9V
   • D.0.6V
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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?
   • A.6.2 A
   • B.5.2 A
   • C.4.2 A
   • D.2.2 A
   • E.1.2 A
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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:
   • A.3/5 ohms
   • B.2 ohms
   • C.6/5 ohms
   • D.3 ohms
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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:
   • A.7.86C
   • B.200C
   • C.400C
   • D.600C
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5. Question 5
   When the current is drawn from a cell, its terminal potential difference and emf are
   • A.Different
   • B.Same
   • C.Both zero
   • D.None of them
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6. Question 6
   A 250 V bulb passes a current of 0.3 A. Calculate the power in the lamp.
   • A.50 W
   • B.75 W
   • C.100 W
   • D.90 W
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7. Question 7
   Kirchhoff’s current law is applicable to which type of circuits:
   • A.Series
   • B.Parallel
   • C.Any of these
   • D.None of these
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8. Question 8
   Voltage has the same units as that of?
   • A.Current
   • B.Magnetic induction
   • C.Emf
   • D.Mutual inductance
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