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Electric Circuits

Electric Circuits
The ratio of the resistance of a 200 W, 230 V lamp to that of a 100 W, 115 V lamp will be

 4.
 0.25.
  0.5.
  2.

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Electric Circuits
The absolute charge of an electron is

 + 1.6 × 10-19 C.
 - 1.6 × 10-19 C.
 1.6 × 10-19 C.
 none of above.

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Electric Circuits
What is the real power in AC operation?

 None of these.
 Both option A and B.
 VIcosφ.
 Apperant power × cosφ.

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Electric Circuits
Highest current density is usually recommended for

  chromium plating.
  bronze plating.
  cadmium plating.
  tin plating.

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Electric Circuits
The resistance of 100 W, 200 V lamp is

 800 Ω.
 400 Ω.
 200 Ω.
 1600 Ω.

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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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