PN-junction diode works as a insulator, if connected

(a) To A.C.                              (b) In forward bias
(c) In reverse bias                   (d) None of these

Concept Questions :-

Applications of PN junction
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The reverse biasing in a PN junction diode

1. Decreases the potential barrier

2. Increases the potential barrier

3. Increases the number of minority charge carriers

4. Increases the number of majority charge carriers

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The electrical resistance of depletion layer is large because

1. It has no charge carriers

2. It has a large number of charge carriers

3. It contains electrons as charge carriers

4. It has holes as charge carriers

Concept Questions :-

Types of semiconductors
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In the circuit given below, the value of the current is

(a) 0 amp                          (b) 10-2 amp
(c) 102 amp                       (d) 10-3amp

Concept Questions :-

Applications of PN junction
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The PN junction diode is used as

(a) An amplifier                       (b) A rectifier
(c) An oscillator                       (d) A modulator

Concept Questions :-

Applications of PN junction
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Two PN-junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be 

(a) In the circuit (1) and (2)                    (b) In the circuit (2) and (3)
(c) In the circuit (1) and (3)                    (d) Only in the circuit (1)

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In the depletion region of an unbiased P-N junction diode there are

(a) Only electrons

(b) Only holes

(c) Both electrons and holes

(d) Only fixed ions

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On increasing the reverse bias to a large value in a PN-junction diode, current

(a) Increases slowly                  (b) Remains fixed
(c) Suddenly increases              (d) Decreases slowly

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In the case of forward biasing of PN-junction, which one of the following figures correctly depicts the direction of flow of carriers

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A semiconductor device is connected in a series circuit with a battery and a resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be

(a) A P-type semiconductor                (b) An N-type semiconductor
(c) A PN-junction                               (d) An intrinsic semiconductor

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