CBSE  /  Class 12  /  Physics  /  Alternating Current

  • 1. 
    The average value of a cover a complete cycle is:

  • l0
  • \(\frac{l_0}{2}\)
  • \(\frac{l_0}{√2}\)
  • zero

  • 2. 
    Power factor of an ac circuit is a measure of:

  • virtual power
  • power lost in the circuit
  • mean power
  • all the above

  • 3. 
    The dimensional formula of L/R is similar to that of:

  • frequency
  • time
  • length
  • none of these

  • 4. 
    Which of the following has dimensions different from the rest?

  • L/R
  • \(\frac{1}{RC}\)
  • \(\sqrt{LC}\)
  • RC

  • 5. 
    The dimensional formula of impedance is;

  • [ML2T-2A-2]
  • [ML2T-3A-2]
  • [ML2T-2A-1]
  • [ML2T-2A-3]

  • 6. 
    Energy dissipates in LCR circuit in :

  • L only
  • C only
  • R only
  • All of the above

  • 7. 
    An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the

  • 15 V
  • 120 V
  • 180 V
  • 960 V

  • 8. 
    What is the ratio of inductive and capacitance reactances in an ac circuit?

  • 1
  • ω²L
  • ω²LC
  • l

  • 9. 
    An acceptor circuit is :

  • series resonant circuit
  • parallel resonant circuit
  • LCR circuit
  • None of these

  • 10. 
    A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:

  • 10-4 H
  • 10-8 H
  • 10-6 H
  • 10-2 H
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