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Electric Circuits

Electric Circuits
Active filter consists of

 op-amp and capacitor.
 inductor.
 op-amp.
 capacitor.

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Electric Circuits
A 10Ω resistor is stretched to increase its length double. Its resistance will now be

 10 Ω.
 5 Ω.
 20 Ω.
 40 Ω.

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

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

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Electric Circuits
Current locus is obtained by which of the following?

None of these
 Varying any one of the circuit element
 Either of these
 Varying source frequency

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Electric Circuits
If c1 = 8 μF, c2 = 4 μF, c3 = 7 μF c1, c2 are in series with c3 in parallel; effective capacitance will be

 3 μF.
 6 μF.
 2.21 μF.
 9.67 μF.

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Electric Circuits
If the dielectric of a capacitor is replaced by conducting material

 the capacitance value of the plate will decrease.
 the plate will get short circuited.
 the capacitor can store infinite charge.
 the capacitor will get heated up due to eddy currents.

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MORE MCQ ON Electric Circuits

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