In a junction diode, the holes are due to

(a) Protons                               (b) Neutrons
(c) Extra electrons                     (d) Missing of electrons

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Types of semiconductors
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In forward bias, the width of potential barrier in a P-N junction diode 

(a) Increases

(b) Decreases

(c) Remains constant

(d) First increases then decreases

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The cause of the potential barrier in a P-N diode is

(a) Depletion of positive charges near the junction

(b) Concentration of positive charges near the junction

(c) Depletion of negative charges near the junction

(d) Concentration of positive and negative charges near the junction

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In a PN-junction diode not connected to any circuit

(a) The potential is the same everywhere

(b) The P-type is at higher potential than the N-type side

(c) There is an electric field at the junction directed from the N- type side to the P- type side

(d) There is an electric field at the junction directed from the P-type side to the N-type side

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Which of the following statements is not true

(a) The resistance of intrinsic semiconductors decrease with increase of temperature

(b) Doping pure with trivalent impurities give P-type semiconductors

(c) The majority carriers in N-type semiconductors are holes

(d) A PN-junction can act as a semiconductor diode

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Types of semiconductors
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The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon P-N junctions are

(a) Drift in forward bias, diffusion in reverse bias

(b) Diffusion in forward bias, drift in reverse bias

(c) Diffusion in both forward and reverse bias

(d) Drift in both forward and reverse bias

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Which one is reverse-biased

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Applications of PN junction
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Which one is in forward bias

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The reason of current flow in P-N junction in forward bias is

(a) Drifting of charge carriers

(b) Minority charge carriers

(c) Diffusion of charge carriers

(d) All of these

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The resistance of a reverse biased P-N junction diode is about 
(a) 1 ohm                        (b) 102ohm
(c) 103 ohm                     (d) 106 ohm

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