134.  In p-type semiconductor, with ND >> NA minotiry carrier electron concentration n equals
A. ND ? NA
B. NA ? ND
C.(d)
D.

---

135.  In n-type semiconductor, with ND >> NA minority carrier hole concentration p equals where ND and NA are donor and acceptor concentrations respectively
A. ND ? NA
B. NA ? ND
C. NA-ND
D.NAND

---

136.  If donor concentration ND equals acceptor concentration NA, resulting semiconductor is
A. n-type
B. p-type
C. intrinsic
D. may be p or n type depending on temperature

---

137.  When a semiconductor is doped, its electrical conductivity
A. increases
B. decreases in the direct ratio of doped material
C. decreases in the inverse ratio of doped material
D. remain unaltered

---

138.  When a normal atom loses one electron
A. the atom loses one porton also
B. atom becomes a positive ion
C. atom becomes a negative ion
D. rest of the electrons move faster

---

139. Excess mojority carriers are the carriers which are
A. in excess of the equilibrium number
B. thermally generated
C. in excess of the minority carrier
D. total majority carriers

---

140. In any conductor, Hall voltage VH is proportional to where B is the magnetic field
A. B
B. B2
C. B3
D.B4

---