Alternating Current

Subject matter experts of JagranJosh have developed chapter wise practice questions of Class 12th as per the relevancy of the chapter in the CBSE board exam. This practice set contains 10 questions with detailed explanations on “Chapter: Alternating Current” of Physics.

  • Q1.The output of a step-down transformer is measured to be 24 V when connected to a 12 watt light bulb. The value of the peak current is

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  • Q2.As the frequency of an ac circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?
    (i) Inductor and capacitor.
    (ii) Resistor and inductor.
    (iii) Resistor and capacitor.
    (iv) Resistor, inductor and capacitor.

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  • Q3.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 ?
    (i) Only resistor.
    (ii) Resistor and an inductor.
    (iii) Resistor and a capacitor.
    (iv) Only a capacitor.

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  • Q4.Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statement is not correct?

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  • Q5.For an LCR circuit, the power transferred from the driving source to the driven oscillator is P = I2Z cos φ.Which of the following statement is incorrect.

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  • Q6.When an AC voltage of 220 V is applied to the capacitor C

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  • Q7.If a LC circuit is considered analogous to a harmonically oscillating spring block system, which energy of the LC circuit would be analogous to potential energy ?

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