131. 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
132. A hole and electron in close proximity would tend to ……..
(a) repel each other
(b) attract each other
(c) have no effect on each other
(d) none of the above
133. In a semiconductor, current conduction is due ……..
(a) only to holes
(b) only to free electrons
(c) to holes and free electrons
(d) none of the above
134. The random motion of holes and free electrons due to thermal agitation is called ……..
(a) diffusion
(b) pressure
(c) ionisation
(d) none of the above
135. A forward biased pn junction has a resistance of the ……..
(a) order of Ω
(b) order of k Ω
(c) order of M Ω
(d) none of the above
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- 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