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Semiconductor Materials – 1 – 4

16. While plotting the V-I characteristics of semiconductor diode, the voltage is plotted along horizontal axis and the current along the vertical axis because :

(a) The voltage and currents are independent variables
(b) The voltage and currents are dependent variable
(c) The voltage is dependent and the current is independent variable
(d) The voltage and the current are dependent variables

ANSWER

EXPLANATION

17. In a semiconductor diode, the time constant equals to :

(a) Value of majority carrier lifetime
(b) Value of minority carrier lifetime
(c) Diffusion capacitance time constant
(d) Zero

ANSWER

EXPLANATION

18. As the temperature increases in a semiconductor, the densities of the electrons and holes :

(a) Increase
(b) Decrease
(c) Become equal
(d) Can’t be defined

ANSWER

EXPLANATION

19. Drift current in the semiconductors depends upon :

(a) only the electric field
(b) only the carrier concentration gradient
(c) both the electric field and the carrier concentration
(d) both the electric field and the carrier concentration gradient

ANSWER

EXPLANATION

20. The conductivity of the intrinsic semiconductor at absolute temperature is :

(a) 1.1 eV
(b) 0.63 eV
(c) Zero
(d) Infinity

ANSWER

EXPLANATION

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