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CBES Board(Class 12-Physics)MCQ Questions with Answers(Chapter 7 Alternating Current)

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1. In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be




2. In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?




3. In which of the following circuits the maximum power dissipation is observed?




4. In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is




5. At resonance frequency the impedance in series LCR circuit is




6. At resonant frequency the current amplitude in series LCR circuit is




7. Quality factor and power factor both have the dimensions of




8. A transformer works on the principle of




9. For an ideal-step-down transformer, the quantity which is constant for both the coils is