300+ TOP MCQs on Semiconductor Diode and Answers

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MCQs on Semiconductor Diode :

1. In the forward bias arrangements of a PN junction diode
(A) The N end is connected to the positive terminal of the battery
(B) The P end is connected to the positive terminal of the battery
(C) The direction of the current is from N end to the P end in the diode
(D) The P end is connected to the negative terminal of the battery

Answer

Answer: (B) The P end is connected to the positive terminal of the battery

2. In a PN junction diode
(A) The current in the reverse biased condition is generally very small
(B) The current in the reverse biased condition is generally very small but the forward-biased current is independent of the bias voltage
(C) The reverse-biased current is strongly dependent on the applied bias voltage
(D) The forward biased current is very small in comparison to reverse-biased current.

Answer

Answer: (A) The current in the reverse biased condition is generally very small

3. The cut-in voltage for silicon diode is approximately
(A) 0.2 V
(B) 0.6 V
(C) 1.1 V
(D) 1.4 V

Answer

Answer: (B) 0.6 V

4. The electrical resistance of the depletion layer is large because
(A) It has no change carriers
(B) It has a large number of charge carriers
(C) It contains electrons as charge carriers
(D) It has holes as charge carriers

Answer

Answer: (A) It has no change carriers

5. If the forward voltage in a semiconductor diode is doubled, the width of the depletion layer will
(A) Become half
(B) Become one-fourth
(C) Remain unchanged
(D) Become double

Answer

Answer: (A) Become half

6. The PN junction diode is used as
(A) An amplifier
(B) A rectifier
(C) An oscillator
(D) A modulator

Answer

Answer: (B) A rectifier

7. When a PN junction diode is reverse biased
(A) Electrons and holes are attracted towards each other and move towards the depletion region
(B) Electrons and holes move away from the junction depletion region
(C) Height of the potential barrier decreases
(D) No change in the current takes place

Answer

Answer: (B) Electrons and holes move away from the junction depletion region

8. A PN junction has a thickness of the order
(A) 1 cm
(B) 1 mm
(C) 10^-6 m
(D) 10^-12 cm

Answer

Answer: (C) 10^-6 m

9. In the depletion region of an unbiased PN junction diode there are
(A) Only electrons
(B) Only holes
(C) Both electrons and holes
(D) Only fixed ions

Answer

Answer: (D) Only fixed ions

10. 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

Answer

Answer: (C) Suddenly increases