Q.16 Pure form of Ge or Si is known as _____
A. an intrinsic semiconductors
B. an extrinsic semiconductors
C. trivalent
D. penta valent
Ans.: A
Q.17 Which of the following is charge carrier for conduction In intrinsic semi-conductor?
A. Holes
B. free electrons
C. Both holes and free electrons
D. holes or free electrons
Ans.: C
Q.18 Which of the following is tetravalent element?
A. Si
B. Ge
C. Boron and Gallium
D. Both A and B
Ans.: D
Q.19 In intrinsic semi conductor
A. number of holes is equal to number of electrons
B. number of holes is greater than number electrons
C. number of holes is less than number electrons
D. none of the above
Ans.: A
Q.20 In Germanium the mobility of electrons is ____ to that of holes.
A. Three times
B. nearly twice
C. four times
D. less than
Ans.: B
Q.21 At 0 K the highest energy level which an electron can occupy is called___
A. forbidden gap
B. energy gap
C. Fermi level
D. valance band
Ans.: C
Q.22 In Silicon the mobility of electrons is ____ to that of holes.
A. two times
B. four times
C. eight times
D. six times
Ans.: B
Q.23 Pure semiconductors are doped with_____ substance to increase their conductivity.
A. trivalent
B. pentavalent
C. Both A or B
D. tetravalent
Ans.: C
Q.24 The doped semi conductors are known as____
A. intrinsic semi conductor
B. extrinsic semi conductor
C. holes majority carries
D. electrons majority carries
Ans.: B
Q.25 Which of the following method is/are used for doping?
A. adding impurity atom in the molten state of semi conductor
B. heating the crystal in the presence of dopant atoms
C. bombarding semi conductor by ions of impurity atoms
D. all of the above
Ans.: D
Q.26 Which of the following is/are an example of extrinsic semi conductor?
A. P-type
B. N-type
C. Both A and B
D. pure semi conductor
Ans.: C
Q.27 When a trivalent substance are added in sufficient amount in pure semiconductor substance is known as___.
A. P-type semi conductor
B. N-type semi conductor
C. extrinsic semi conductor
D. none of the above
Ans.: A
Q.28 Which of the following is/are trivalent substances?
A. Boron
B. Aluminum, Gallium
C. Indium
D. all of the above
Ans.: D
Q.29 In intrinsic semi conductor the Fermi energy level is exactly at the mid point of the ____.
A. energy gap
B. conductance band
C. forbidden gap
D. any of the above
Ans.: C
Q.30 In P-type semi-conductor ____ majority carrier.
A. holes
B. electrons
C. ions
D. all of the above
Ans.: A
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