16. The devices commonly used for making digital circuits are :
(a) Mechanical switches
(b) Relays
(c) Vacuum tubes
(d) Semiconductor devices
17. Which one of the following possesses negative resistance characteristics ?
(a) Schottky diode
(b) Tunnel diode
(c) PN junction diode
(d) Hot-carrier diode
18. The region between the peak and valley points of the tunnel diode is called as :
(a) Pinch-off region
(b) Saturation region
(c) Cut-off region
(d) Negative conduction region
19. Avalanche breakdown occurs when :
(a) The forward current is excessive
(b) The forward bias exceeds a certain value
(c) The reverse bias exceeds a certain value
(d) The potential barrier is reduced to zero
20. Zener diode exhibits :
(a) Avalanche breakdown
(b) Zener breakdown
(c) Both (a) & (b)
(d) Neither (a) nor (b)
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