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Electric Circuits

Electric Circuits
Which of the following has least resistivity?

 Mercury.
 Copper.
 Lead.
 Aluminium.

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Electric Circuits
A variable capacitance is one whose capacitance

 changes with time.
 changes with voltage.
 can be changed manually or by mechanical force.
 changes with temperature.

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Electric Circuits
A motor having a power factor of 0.8 absorbs in active power of 1200 W the reactive power drawn from the supply is _________ VA.

 400
 130
 250
 900

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Electric Circuits
For closer tolerance which of the following capacitors is usually preferred?

 Ceramic disc capacitor.
 Paper capacitor.
 None of them.
 Mica capacitor.

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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

 36.36.
 40.25.
 76.66.
 66.66.

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Electric Circuits
What is the value of charge of an electron?

 1.6022 × 10-27 Coulomb
 1.6022 × 10-8 Coulomb
 1.6022 × 10-19 Coulomb
 1.6022 × 10-7 Coulomb

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