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Electric Circuits

Electric Circuits
The electrical conductivity of metal is typically of the order of (in ohm - m)

 105.
 107.
 10 - 6.
 10 - 4.

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Electric Circuits
The resistivity of semi-conductors at room temperatures is

 1000 to 1500 ohm - cm.
 0.01 to 50 ohm - cm.
 109 to 1012 ohm - cm.
 1.6 × 106 to 100 × 106 ohm - cm.

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Electric Circuits
In ac RC series circuit total voltage is 10V and voltage across resistor is 6V, then what is voltage across capacitor?

 10V
 8V
 4V
 16V

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 ω σ/ε.
 σ ω ε.
 ω ε/σ.
  σ/ω ε.

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Electric Circuits
A voltage of v = 100 sin (wt + π/3) is applied to pure resistor of 30 Ohm. What is the RMS value of current is

 1.92.
 5.77.
 2.36.
 4.71.

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Electric Circuits
Which of following materials has the least resistivity ?

  Zinc.
  Copper.
  Lead.
  Mercury.

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MORE MCQ ON Electric Circuits

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