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Electric Circuits

Electric Circuits
Which of following capacitors has relatively shorter shelf life?

 both (B) and (C) above.
 Paper.
 Electrolytic.
 Glass.

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Electric Circuits
Four resistances 80 Ohm, 50 Ohm, 25 Ohm and R are connected in parallel. Current through 25 Ohm resistance is 4A. Total current of supply is 10A. The value of R will be

 66.66.
 76.66.
 36.36.
 40.25.

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Electric Circuits
Time constant is the time taken for response to rise -------of maximum value?

 68.3%
 63.2%
 100%
 90%

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Electric Circuits
Among the options which metal has the highest electrical conductivity?

 Stranded aluminium.
 Aluminium.
 Steel.
 Copper.

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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

  2.
  0.5.
 0.25.
 4.

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Electric Circuits
A parallel plate capacitor has a capacitance of C farad. It area of the plates is doubled and the distance between them is half, the capacitance of the capacitor is

 2C Farad.
 4C Farad.
 C Farad.
 16C Farad.

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