AP POLYCET PHYSICS Multiple Choice Questions (MCQs)

AP POLYCET Physics - Electric Current MCQs

76. What is the SI unit of electric current?
    A) Volt
    B) Ampere
    C) Ohm
    D) Coulomb
    Answer: B) Ampere
77. Which of the following is the unit of resistance?
    A) Ampere
    B) Volt
    C) Ohm
    D) Coulomb
    Answer: C) Ohm
78. What is the relationship between current, voltage, and resistance?
    A) Ohm's Law
    B) Faraday's Law
    C) Kirchhoff's Law
    D) Coulomb's Law
    Answer: A) Ohm's Law
79. In a circuit, the current flowing through a conductor is directly proportional to the voltage applied across it. What is this principle called?
    A) Law of conservation of energy
    B) Ohm's Law
    C) Joule's Law
    D) Lenz's Law
    Answer: B) Ohm's Law
80. What is the power dissipated by a resistor if the current is 2A and the resistance is 3Ω?
    A) 6W
    B) 12W
    C) 18W
    D) 9W
    Answer: A) 6W
81. Which of the following materials is an example of a conductor?
    A) Rubber
    B) Wood
    C) Copper
    D) Plastic
    Answer: C) Copper
82. What is the effect of increasing the resistance in a circuit, while keeping the voltage constant?
    A) Decreases current
    B) Increases current
    C) No effect on current
    D) Decreases voltage
    Answer: A) Decreases current
83. In a series circuit, if the resistance increases, the total current will:
    A) Increase
    B) Decrease
    C) Remain the same
    D) Become zero
    Answer: B) Decrease
84. Which of the following does not obey Ohm’s Law?
    A) Copper wire
    B) A filament lamp
    C) Resistor
    D) Silver wire
    Answer: B) A filament lamp
85. What is the total resistance in a series circuit with resistors of values 2Ω, 3Ω, and 5Ω?
    A) 10Ω
    B) 4Ω
    C) 5Ω
    D) 3Ω
    Answer: A) 10Ω
86. What is the formula for calculating power in an electrical circuit?
    A) P = IV
    B) P = I²R
    C) P = V²/R
    D) All of the above
    Answer: D) All of the above
87. Which instrument is used to measure electric current?
    A) Voltmeter
    B) Ammeter
    C) Galvanometer
    D) Multimeter
    Answer: B) Ammeter
88. Which of the following factors affects the resistance of a conductor?
    A) Material
    B) Length
    C) Cross-sectional area
    D) All of the above
    Answer: D) All of the above
89. In a parallel circuit, the total current is:
    A) Equal to the sum of the currents through each resistor
    B) Less than the current through each resistor
    C) The same as the current through the smallest resistor
    D) The same as the current through the largest resistor
    Answer: A) Equal to the sum of the currents through each resistor
90. If the potential difference across a resistor is doubled, the current through the resistor will:
    A) Double
    B) Half
    C) Stay the same
    D) Quadruple
    Answer: A) Double

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