CBSE  /  Class 12  /  Physics  /  Alternating Current

  • 1. 
    In series resonant circuit:

  • reactance is zero
  • current is zero
  • voltage is zero
  • None of these

  • 2. 
    In parallel resonant circuit:

  • impedance is very high
  • current is very high
  • voltage is very high
  • None of these

  • 3. 
    The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary

  • 6 V
  • 12 V
  • 24 V
  • 48 V

  • 4. 
    Transformer works on the principle of:

  • convertor
  • invertor
  • mutual induction
  • self-induction

  • 5. 
    Which of the following effects is not shown in alternating current ?

  • Chemical effect
  • Magnetic effect
  • Heating current
  • All of these

  • 6. 
    An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:

  • 5 A
  • 5√2A
  • \(\frac{5}{√5}\) A
  • zero

  • 7. 
    The phase difference b/w the A.C. and e.m.f. \(\frac{π}{2}\) Which of the following can not be the instituent of the circuit?

  • LC
  • L alone
  • C alone
  • RL

  • 8. 
    The Q factor of an LCR circuit at resonance is :

  • \(\sqrt{R^2+ω^2L^2}\)
  • \(\sqrt{R^2+(\frac{1}{cω}})^2\)
  • \(\frac{ω_rL}{R}\)
  • \(\sqrt{R^2+\frac{1}{c^2ω^2}}\)

  • 9. 
    Faraday constant:

  • depends on the amount of the electrolyte
  • depends on the current in the electrolyte
  • is a universal constant
  • depends on the amount of charge passed through the electrolyte

  • 10. 
    The natural frequency of an L -C-Circuit is equal to :

  • \(\frac{\sqrt{LC}}{2π}\)
  • \(\frac{1}{3π\sqrt{LC}}\)
  • \(\frac{1}{2π}\sqrt{\frac{L}{C}}\)
  • \(\frac{1}{2π}\sqrt{\frac{C}{L}}\)
Report Question
warning
Practice More On Alternating Current
Quiz 1 Quiz 2 Quiz 3
access_time
  Time