Semiconductor Materials » Exercise – 3
101. The material whose Hall effect is found to be zero is :
(a) Conductor
(b) Insulator
(c) Extrinsic semiconductor
(d) Intrinsic semiconductor
102. Widely used semiconductors such as silicon, germanium are placed in …….. .
(a) First column
(b) Second column
(c) Third column
(d) Fourth column
103. The resistivity of pure silicon decreases :
(a) With decrease in temperature
(b) With increase in temperature
(c) With constant temperature
(d) None of these
104. If an excess carrier is injected into semiconductor :
(a) They diffuse away from the point of injection
(b) They concentrate at the point of injection
(c) They randomly move but centered at the point of injection
(d) They uniformly distribute themselves
105. Consider the statements : Statement I : Fermi level is slightly lowered by adding the donor impurity. Statement II : Fermi level is the maximum energy that any electron can have at room temperature. Which of the following is correct ?
(a) Statement I
(b) Statement II
(c) Both statements I & II
(d) Either statement I or II
Related Posts
Semiconductor Materials » Exercise - 3129. Addition of trivalent impurity to a semiconductor creates many ........ (a) holes (b) free electrons (c) valence electrons (d) bound electrons- Semiconductor Materials » Exercise - 299. Addition of pentavalent impurity to a semiconductor creates many ........ (a) free electrons (b) holes (c) valence electrons (d) bound electrons
- Semiconductor Materials » Exercise - 4159. The addition of pentavalent impurity to a semiconductor creates more : (a) Free electrons (b) Holes (c) Positrons (d) Free electrons and holes
- Semiconductor Materials » Exercise - 3148. At absolute temperature, an intrinsic semiconductor has ........ (a) a few free electrons (b) many holes (c) many free electrons (d) no holes or free electrons
- Semiconductor Materials » Exercise - 4153. In a substance the conduction band and valence band are separated by a energy gap of the order of 1 eV, and there are at room temperature as money electrons in the conduction band as holes in the valence band. The substance is : (a) An intrinsic semiconductor (b) A p-type semiconductor (c) A N-type semiconductor (d) A doped semiconductor