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Electric Circuits

Electric Circuits
Conductance of any conductor is expressed as

  mho.
  volt2 / watt.
  watt / ampere2.
  ampere / watt.

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Electric Circuits
Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

  3 Ω and 6 Ω.
 6 Ω and 9 Ω.
 3 Ω and 9 Ω.
  1.5 Ω and 3 Ω.

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Electric Circuits
The hot resistance of a tungsten lamp is about 10 times the cold resistance. Accordingly, cold resistance of a 100 W, 200 V lamp will be

 4 Ω.
 800 Ω.
  40 Ω.
 400 Ω.

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Electric Circuits
A parallel plate capacitor has a capacitance of C farad. It area of the plates is doubled and the distance between them is half, the capacitance of the capacitor is

 4C Farad.
 C Farad.
 16C Farad.
 2C Farad.

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Electric Circuits
The plates of lead acid storage battery are most likely to be short circuited if

 the electrolyte evaporates.
 too much water is added.
 sediment collect at the bottom of the battery.
 the battery charged too slowly.

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Electric Circuits
Two identical resistors are first connected in parallel then in series. The ratio of resultant resistance of the first combination to the second will be

 4.
 0.5.
 2.
 0.25.

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