Q. The steady flow of electrons in one particular direction caused by the applied electric field constitutes an electric current is called the_____.
A. diffused process
B. drift current
C. electric current
D. EMF
Ans.: B
Q. _____ is the process in which particles flow from a region of high concentration to a region of lower concentration.
A. EMF
B. Drift current
C. Diffused
D. any of the above
Ans.: C
Q. The current that results from the diffusion of charged particles is termed as___.
A. Electric current
B. conventional current
C. drift current
D. diffused current
Ans.: D
Q. The covalent bonding arrangement is exist in______.
A. germanium
B. silicon
C. Both A and B
D. none of the above
Ans.: C
Q. Semiconductors are classified into ____.
A. Dielectric
B. Intrinsic or pure
C. extrinsic impure
D. Both B and C
Ans.: D
Q. _____ materials are those semiconductors that have very low level of impurities.
A. extrinsic
B. intrinsic
C. insulator
D. Both A and B
Ans.: D
Q. ______and _______ are most widely used semiconductor materials used in electronic industries.
A. silicon, germanium
B. copper, germanium
C. copper, Aluminium
D. Aluminium, silicon
Ans.: A
Q. At absolute temperature EGfor silicon and germanium are____ and _____.
A. 2.25 eV, 0.5eV
B. 1.21 eV, 0.785eV
C. 1.21 eV, 7.85 eV
D. 21.1 eV, 0.785 eV
Ans.: B
Q. The mobility of hole is about____ that of an electron.
A. double
B. three times
C. same as
D. half
Ans.: D
Q. The resistance of a semiconductor depends largely on____.
A. temperature
B. Illumination
C. magnitude of the electric filed
D. All of the above
Ans.: D
Q. Which of the following is /are true “the resistance of a semiconductor”?
A. decrease with the increase in temperature
B. decrease with brighter surrounding
C. Both A and B
D. none of the above
Ans.: C
Q. Depending on type of impurities added, the extrinsic conductors can be classified into___.
A. N- type
B. P- type
C. Both A and B
D. none of the above
Ans.: D
Q. A _____ material is formed by adding donor atoms.
A. N-type
B. P-type
C. Intrinsic
D. All of the above
Ans.: A
Q. A P-type material is formed by adding____ atoms.
A. valance electron
B. holes
C. acceptors
D. Donor
Ans.: C