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

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

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Electric Circuits
What is referred as the average value in AC opearation?

 Average of all values of an alternating quantity.
  Average of all values of an alternating quantity over a complete cycle.
 Average of all values of the (+)ve and (-)ve half.
 Average of all values of the phase sequences.

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Electric Circuits
Two electric bulbs have transparent filament of same thickness. It one of them gives 60 W and other gives 100 W, then-

 60 W lamp filament has shorter length.
 60 W and 100 W lamp filament have equal length.
 60 W lamp filament has longer length.
 100 W lamp filament has longer length.

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