1. Are the materials in which the electrical properties lie in between the conductor and insulator
(A) conductors
(B) insulator
(C) all three
(D) semiconductors
2. The resistivity is 10⁴ ohm-meter
(A) conductors
(B) semiconductors
(C) insulator
(D) all three
3. Have four electrons in their outermost shell
(A) conductors
(B) insulator
(C) all three
(D) semiconductors
4. The conductivity increases with the increase in temperature
(A) semiconductors
(B) insulator
(C) conductors
(D) all three
5. Si, Ge, carbon and Te etc are the examples of
(A) conductors
(B) insulator
(C) all three
(D) semiconductors
6. Both silicon and germanium belong to the group of the periodic table
(A) V-A
(B) III-A
(C) IV-A
(D) VII-A
7. Silicon can be written like
(A) ¹⁴Si²⁷
(B) ¹⁵Si²⁹
(C) ¹⁴Si²⁸
(D) ¹⁵Si²⁸
8. Germanium can be written as
(A) ³²Ge⁷⁴
(B) ³²Ge⁷²
(C) ³²Ge⁷³
(D) ³²Ge⁷⁵
9. Both silicon and germanium have electrons in their outermost valence shell
(A) 3, 3
(B) 4, 4
(C) 5, 5
(D) 6, 6
10. Semiconductors become insulator at the _____ Kelvin temperature
(A) 10
(B) 0
(C) 20
(D) 30
11. A completely filled band is called
(A) insulator
(B) conduction band
(C) conductor
(D) valence band
12. A partly filled band is called
(A) conduction band
(B) valence band
(C) conductor
(D) insulator
13. The empty space present between the conduction band and the valence band is called
(A) conduction band
(B) forbidden band
(C) valence band
(D) no one
14. The energy gap is also called
(A) forbidden band
(B) valence band
(C) conduction band
(D) no one
15. It only exists in the semiconductors and insulators and is absent in conductor
(A) conduction band
(B) valence band
(C) no one
(D) forbidden band
16. The pure semiconductor without any addition or additive is called
(A) N-type
(B) extrinsic semiconductors
(C) P-type
(D) intrinsic semiconductors
17. The semiconductor having some addition or additive is called
(A) intrinsic semiconductors
(B) P-type
(C) extrinsic semiconductors
(D) N-type
18. When a semiconductor like Si is doped with a member of group III-A having 3 valence electrons like boron is called
(A) intrinsic semiconductors
(B) extrinsic semiconductors
(C) P-type
(D) N-type
19. When a semiconductor like Si is doped with a member of group V-A having 5 valence electrons like antimony is called
(A) N-type
(B) extrinsic semiconductors
(C) P-type
(D) intrinsic semiconductors
20. The process of mixing of a semiconductor with a member of group III-A or V-A is called
(A) all three
(B) P-type
(C) N-type
(D) doping