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Electric Circuits

Electric Circuits
Which cell has the reversible chemical reaction?

 Lead acid.
 Carbon Zinc.
 Silver oxide.
 Mercury oxide.

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Electric Circuits
If a pure inductor is connected across the ac source, the average power taken by the inductor is

 maximum power.
 100 watt.
 a few watt.
 zero watt.

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Electric Circuits
Two resistors R1 and R2 give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances are

 1.25 Ohm and 3.25 Ohm.
 2.2 Ohm and 2.3 Ohm.
 2 Ohm and 2.5 Ohm.
 1.5 Ohm and 3 Ohm.

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Electric Circuits
If the three colour bands of a resistor are grey, violet and gold, what is the value of the resistor?

 9.7 ohms.
 7.7 ohms.
 6.7 ohms.
 8.7 ohms.

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Electric Circuits
What are the points to be mentioned in specifying main switches?

  Voltage grade.
  Current rating.
  None of these.
  Both A and B.

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Electric Circuits
In RL series circuit R=2Ω and L=2mH. What is the value of time constant?

 4msec
 1msec
 2msec
 100sec

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MORE MCQ ON Electric Circuits

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