Quiz  /  RC Circuits Class 12 MCQ Questions With Answers

  • 1. 
    After the switch is closed, the current is

  • 0.000045(1-e-t/RC)
  • 0.000045e-t/RC

  • 2. 
    If there are 6 batteries in the circuit shown, how many volts are in the circuit?

  • 1.5
  • 6
  • 9
  • 54

  • 3. 
    When the capacitor is fully charged, the voltage across the capacitor is _________ and the current in the circuit is _________.

  • 45 V, 0 A
  • 0 V, 45 microA
  • 22.5 V, 45 micro A
  • 3 microV, 0 A

  • 4. 
    The time constant for this circuit is

  • 0
  • 3 seconds
  • 3 microseconds
  • 0.33 seconds

  • 5. 
    What is the voltage at each branch in the circuit below?

  • 2
  • 4
  • 6
  • 18

  • 6. 
    Calculate the current for a 120-volt refrigerator that uses 650 watts of power.

  • 0.18
  • 5.4
  • 120
  • 78,000

  • 7. 
    Immediately after the switch is closed, the voltage across the 3uF capacitor is

  • 0 V
  • 45 V
  • 22.5 V
  • 45e-t/RC V

  • 8. 
    After the switch is closed, the voltage across the capacitor is

  • 45(1 - e-t/RC)
  • 45(e-t/RC)

  • 9. 
    A motor has a current of 2.00 A flowing through it when it is powered with a 12-volt battery.  What is the power used by the motor?

  • 16
  • 6
  • 14
  • 24

  • 10. 
    Immediately after the switch closes, the current in the circuit is

  • 0 A
  • 45 microAmps
  • 22.5 microAmps
  • 45e-t/RC microAmps
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