Basic Electrical Engineering MCQ_35 (Engineering Material)

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

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