ETEA AT CT PST TT Qari Syllabus MCQS Past Papers pdf

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Join PAF MCQS Test Past Papers Physics download pdf

Join PAF MCQS Test Past Papers Physics download pdf online practice tests
1.Diamond is an electrical.
A. Conductor
B. Semiconductor
C. Superconductor
D. Insulator
ANSWER: D

2.Both electrons and holes serve as charge carriers when the silicon is put under a.
A. Pressure
B. Temperature
C. Conductor
D. Potential difference
ANSWER: D

3.A semiconductor is formed by which bond.
A. Covalent
B. Electrovalent
C. Co-ordinate
D. None
ANSWER: A

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4.The most commonly used semiconductor is.
A. Germanium
B. Silicon
C. Carbon
D. Sulphur
ANSWER: B

5.A semiconductor has generally how many valence electrons.
A. 2
B. 3
C. 6
D. 4
ANSWER: D

6.When a pure semiconductor is heated, its resistance.
A. Goes up
B. Goes down
C. Remains the same
D. None
ANSWER: B

7.When a pentavalent impurity is added to a pure semiconductor, it becomes.
A. An insulator
B. An intrinsic semiconductor
C. P-type semiconductor
D. N-type semiconductor
ANSWER: D

8.Addition of pentavalent impurity to a semiconductor creates many.
A. Free electrons
B. Holes
C. Valence electrons
D. Bound electrons
ANSWER: A

9.The number of valence electrons in pentavalent impurity is.
A. 3
B. 5
C. 4
D. 6
ANSWER: B

10.An n-type semiconductor is.
A. Positively charged
B. Negatively charged
C. Electrically neutral
D. None of the above
ANSWER: C

11.A trivalent impurity has how many valence electrons.
A. 4
B. 5
C. 6
D. 3
ANSWER: D

12.Addition of trivalent impurity to a semiconductor creates many.
A. Holes
B. Free electrons
C. Valence electrons
D. Bound electrons
ANSWER: A

13.As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor.
A. Remains the same
B. Increases
C. Decreases
D. None of the above
ANSWER: C

14.In a semiconductor, current conduction is due to.
A. Only holes
B. Only free electrons
C. Holes and free electrons
D. None of the above
ANSWER: C

15.In the depletion region of a pn junction, there is a shortage of.
A. Acceptor ions
B. Holes and electrons
C. Donor ions
D. None of the above
ANSWER: B

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