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# PN Junction Diode – 1 – 4

16. Match list I and list II and select the correct one using the codes given below :
List I                                                               List II
P. Resistance                                            1. Current noise
Q. Diode                                                    2. Partition noise
R. Triode                                                   3. Shot noise
S. PN junction                                           4. Johnson noise

(a) P- (4), Q – (1), R- (2), S- (3)
(b) P- (2), Q – (3), R- (1), S- (4)
(c) P- (1), Q – (2), R- (3), S- (4)
(d) P- (4), Q – (3), R- (2), S- (1)

Explanation
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17. Capacitive effects are exhibited by PN junctions when they are :

(a) Forward biased
(b) Reverse biased
(c) Either forward or reverse biased
(d) Neither forward nor reverse biased

Explanation
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18. What is the type of capacitance effect exhibited by the PN junction, when it is reverse biased ?

(a) Transition capacitance
(b) Diffusion capacitance
(c) Space charge capacitance
(d) Drift capacitance

Explanation
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19. In a PN junction, the density of carriers is …….. near the junction and decays ………. with distance.

(a) Low, linearly
(b) High, linearly
(c) Low, exponentially
(d) High, exponentially

Explanation
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20. If CT= space change capacitance and CD= storage capacitance of PN junction diode, then :

(a) CT= CD
(b) CT> CD
(c) CT< CD
(d) CT= CD =∞