Q.481 A flow of 1000 electrons per second constitutes a current of
A. 2.6 x 10^-19A
B. 1.6 x 10^-15A
C. 1.602 x 10^-19A
D. 628 x 10^-12A
Ans.: B
Q.482 If the length of a conductor is doubled and its area of cross section is also doubled the resistance of the conductor will
A. Increase four times
B. Unchanged
C. Decreases four times
D. Change at random
Ans.: B
Q.483 Ideal voltage source should have
A. Zero internal resistance
B. Infinite internal resistance
C. Large value of Electro-Magnetic Induction
D. Large value of current
Ans.: A
Q.484 Wheatstone bridge is used to measure
A. Voltage
B. Resistance
C. Current
D. Power
Ans.: B
Q.485 An electric network with six independent nodes will have
A. Ten loop equations
B. Three loop equations
C. Five loop equations
D. Seven loop equations
Ans.: C
Q.486 In a parallel plate capacitor, the capacitance C is given by the relation where d is the distance between two plates. A is the cross sectional are of plate єr is the relative permittivity
A. C = є0 єr d/A
B. C = d/ є0 єr A
C. 1/C = є0 єr d/A
D. 1/C = d/ є0 єrA
Ans.: D
Q.487 When four capacitors of capacitance 1/4 µF are connected in series, the resultant capacitance will be
A. 1 µF
B. 1/8 µF
C. 1/16 µF
D. 4 µF
Ans.: C
Q.488 The input resistance of Cathode Ray Oscilloscope CRO is of the order of
A. Tens of ohm
B. Mega ohm
C. Kilo ohm
D. Fraction of an ohm
Ans.: B
Q.489 A 1 mA ammeter has a resistance of 100 ohm. It is to be converted to a 1A ammeter. The value of shunt resistance is
A. 0.001 ohm
B. 0.1001 ohm
C. 1 x 10^5 ohm
D. 100. Ohm
Ans.: B
Q.490 Why are multimeter provided with separate scale for low A.C voltage
A. To improve the readability of scale
B. For higher accuracy
C. To take into account the high value of
D. None of above
Ans.: C
Q.491 Frequency can be measured by using
B. Maxwell’s bridge
B. Schering bridge
C. Heaviside compel bridge
D. Wein’s bridge
Ans.: D
Q.492 Feedback oscillation have a closed gain of (where G, H are gain of forward and feedback path)
A. G/ 1-GH
B. G/1+GH
C. G/1±GH
D. H/ 1+GH
Ans.: A
Q.493 In an intrinsic semiconductor Fermi Level lies
A. In the middle of conduction and valence band
B. Near conduction band
C. Near valence band
D. None of the above
Ans.: A
Q.494 For the highly doped diode
A. Zener breakdown is likely to take place
B. Avalanche breakdown is likely to take place
C. Both A and B
D. None of the above
Ans.: A
Q.495 The quiescent point Q in a voltage amplifier is selected in the middle of
A. IT gives better stability
B. The circuit needs a small dc voltage
C. Biasing circuit need less number of resistance
D. It gives distortion less output
Ans.: D
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