Home / Semiconductor Materials – 1 – 6

Semiconductor Materials – 1 – 6

26. Recombination of electrons and holes takes place when :

(a) An electron falls into a hole
(b) A positive ion and a negative ion bond together
(c) Avalanche electron becomes a conduction electron
(d) An atom is formed

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

27. Semiconductors are :
(I) Ohmic as they obey Ohm’s law
(II) Bipolar

(a) Only I is true
(b) Only II is true
(c) Both I & II are true
(d) Both I & II are false

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

28. Which of the following statements are correct ?
1. In semiconductor, the mobility of electrons is more than that of holes.
2. In semiconductor, when temperature increases, the resistivity also increases.
3. Metal has positive TCR.
4. In metals, thermal conductivity is inversely proportional to electrical conductivity at constant temperature.

(a) 1, 2, 3
(b) 1, 2, 4
(c) 2, 3, 4
(d) 1, 3, 4

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

29. The carrier mobility in a semiconductor is found to be 0.4 m2/VS. Its diffusion constant at 300 K will be :

(a) 0.43 m2/s
(b) 0.16 m2/s
(c) 0.04 m2/s
(d) 0.01 m2/s

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

30. The Hall coefficient of an intrinsic semiconductor is :

(a) Positive under all conditions
(b) Negative under all conditions
(c) Zero under all conditions
(d) Zero at 0°K

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

1 2 3 4 5 6 7 8 9 10

General Knowledge Books

Be a Part of the New & Next

MCQs fb  MCQs G+

Share the Knowledge

MORE INFORMATION
GATE Total InfoGATE 2019 BooksFree Notes
IES Total InfoIES 2019 BooksFree Mock tests
JAM Total InfoJAM 2019 BooksEngg Diploma
PSUs Total InfoM Tech Total InfoUGC NET Total Info

Leave a Reply

Your email address will not be published. Required fields are marked *

Copy Protected by Chetan's WP-Copyprotect.