Q.76 In diode, practically no current flows and diode do not conduct till____
A. the barrier potential is overcome by internal voltage
B. the barrier potential is overcome by external voltage
C. the barrier potential is overcome by external current
D. the barrier potential is overcome by internal current
Ans.: B
Q. 77 The barrier voltage for Si is ___and for Ge is __
A. 0.3; 0.7
B. 0.7; 0.3
C. 3; 7
D. 7; 3
Ans.: A
Q.78 In ______ the electrons has energy than electrons in _____
A. conduction band; valence band
B. valence band; conduction band
C. forbidden gap; conduction band
D. conduction band; forbidden gap
Ans.: A
Q.79 Resistivity of a semi conductor ______as temperature ____.
A. increases; increases
B. increases; decreases
C. decreases; increases
D. decreases; decreases
Ans.: C
Q.80 Resistivity of a semi conductor depends on ____
A. width of bands
B. length of semi conductor
C. atomic nature of a semi conductor
D. shape and size of a semi conductor
Ans.: C
Q.81 The valence electrons in any semi conductor is ___
A. 8
B. 18
C. 32
D. 4
Ans.: D
Q.82 In PN junction the reverse biased is applied____
A. majority charge carrier current is increase
B. potential barrier is raised
C. minority charge carrier current increases
D. potential barrier is reduced
Ans.: B
Q.83 In PN junction the reverse biased is applied____
A. potential barrier is decreased
B. potential barrier is raised
C. minority charge carrier current increases
D. majority charge carrier current is increase
Ans.: A
Q.84 In which of the following the depletion region in a PN diode is increases?
A. forward biasing
B. reverses biasing
C. diffusion
D. concentration gradient
Ans.: B
Q.85 Why semiconductor is electrically neutral?
A. has no holes carriers
B. has no free electrons
C. has equal number of positive and negative charges
D. has no majority charge carriers
Ans.: C
Q.86 A donor type impurity____
A. only four valance electrons
B. only two valence electrons
C. only five valance electrons
D. only eight valence electrons
Ans.: C
Q.87 The greater is the energy of electrons in the _____
A. nearer orbit
B. larger orbit
C. intermediate orbit
D. any of the above
Ans.: B
Q.88 The free electrons merging in holes are called____.
A. diffusion
B. recombination
C. drift current
D. depletion
Ans.: B
Q.89 A PN junction diode
A. conduct only in reverse biased condition only
B. conduct only in forward biased condition only
C. offers high resistance in forward biased condition
D. offers low resistance in reversed biased condition
Ans.: B
Q.90 In an intrinsic semi conductor as temperature increases__
A. energy of atoms is decreases
B. energy of atom is increases
C. minority charge carriers increases
D. all of the above
Ans.: B
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