Q.1
The arrow direction in the diode symbol indicates
  • Direction of electron flow
  • Direction of hole flow (Direction of conventional current)
  • Opposite to the direction of hole flow
  • None of the above
Q.2
The depletion region contains
  • Electrons
  • Holes
  • Immobilized charge carriers
  • Sea of electrons
Q.3
In a reverse biased PN junction, the current through the junction increases abruptly at
  • 0.5 V
  • 1.1V
  • 0.72 V
  • Breakdown voltage
Q.4
When the diode is forward biased, it is equivalent to
  • An off switch
  • An On switch
  • A high resistance
  • None of the above
Q.5
Main phenomenons associated with formation of p-n junctions are
  • Drift only
  • Diffusion only
  • Diffusion and Drift
  • only doping
Q.6
A forward biased pn junction diode has a resistance of the order of
  • Ω
  • Gelien Sales
Q.7
In Half wave rectifier the diode conducts in only___
  • positive half cycle
  • negative half cycle
Q.8
The depletion region consists of
  • Nothing but minority carriers
  • Positive and negative ions
  • No majority carrier
  • (ii) and (iii)
Q.9
Peak inverse voltage for full wave rectifier
  • 2 VS
  • Vs
Q.10
The current in a semiconductor is produced by
  • electron only
  • holes only
  • negative ions
  • both electrons and holes
Q.11
Which of the following is true in case of an unbiased p-n junction diode?a) b) c)
  • Diffusion of electrons & holes goes on infinitely
  • Charges establish an electric field across the junctions
  • There is zero electrical potential across the junctionsd)
  • Diffusion does not take place
Q.12
When PN junction is in forward bias, by increasing the battery voltage
  • Circuit resistance increases
  • Current through P-N junction increases
  • Current through P-N junction decreases
  • None of the above happens
Q.13
The Value of Barrier Potential for Ge Diode is
  • 1
  • 0.2
  • 0.5
  • 0.6
Q.14
The displacement of the charges results in
  • Magnetic field
  • Electric field
  • Rust
  • Hall effect
Q.15
In a PN junction when the applied voltage overcomes the ........ potential, the diode current is large, which is known as ......
  • Depletion, negative bias
  • Reverse, reverse bias
  • Resistance, reverse bias
  • Barrier, forward bias
Q.16
Characteristics of a diode that helps in rectification
  • Allows Unidirectional flow of current
  • Allows Bidirectional flow of current
  • Opposes the flow of current
  • conducts in reverse biased
Q.17
Anode is _________ Polarity in diodes
  • Negative
  • Positive
  • Ground
  • Hot Side
Q.18
If the positive terminal of the battery is connected to the anode of the diode, then it is known as
  • Forward biased
  • b) Reverse biased
  • c) Equilibrium
Q.19
The forbiddenn energy gap for Germanium is of the order of
  • 0.7 eV
  • 0.3 eV
  • 1.1 eV
  • 10 eV
Q.20
Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
  • Boron
  • Arsenic
  • Indium
  • Gallium
0 h : 0 m : 1 s