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Electric Circuits

Electric Circuits
Which of the following materials has highest electrical conductivity ?

  Copper.
  Steel.
  Silver.
  Aluminium.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 100 V, 100 Hz.
 50√2 V, 100 Hz.
 100 V, 50 Hz.
 100√2 V, 100 Hz.

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Electric Circuits
Which cell has the reversible chemical reaction?

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

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Electric Circuits
Which of following capacitors preferred for high frequency circuits?

 Electrolytic capacitor.
 Mica capacitor.
 Glass capacitor.
 Air capacitor.

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Electric Circuits
If the practical units of voltage and current wave each made 20 times as large as they are at present, what would be the consequent alternation in the size of the unit of capacitance?

 20 times.
 60 times.
 Nil.
 200 times.

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Electric Circuits
The power dissipated in a pure capacitor is

 proportional to the value of capacitance.
 zero.
 proportional to applied voltage.
 both (B) and (C) above.

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