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Electric Circuits

Electric Circuits
Aluminium is produced from bauxite by

  electrolytic process.
  froth flotation.
  oxidation.
  rotating.

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Electric Circuits
What is the SI unit of electric current ?

 Ohm.
 Ampere.
None of these
 Faraday.

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Electric Circuits
For the circuit shown below the value of R is adjusted so as to make the current in RL equal to zero. Calculate the value of R.

 3 Ω.
 1 Ω.
 4 Ω.
 2 Ω.

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Electric Circuits
The energy stored by a capacitor is given by

 all of them.
 1/2 QV.
 Q2 / 2C.
 1/2 CV2.

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Electric Circuits
How many 200W / 220V bulbs connected in series across 220V supply will consume 100W?

 4.
 Not possible.
 2.
 1.

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Electric Circuits
A cube of material of side 1 cm has a resistance of 0.002 Ω between its opposite faces. If the same volume of the material has a length of 4 cm and a uniform cross - section, the resistance of this length will be

  0.128 Ω.
  0.032 Ω.
 0.064 Ω.
 0.016 Ω.

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