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Silicon is a semiconductor. If a small amount of As is added to it, then its electrical conductivity
(b) Impurity increases the conductivity.
A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement
(d) Resistance of conductors (Cu) decreases with decrease in temperature while that of semi-conductors (Ge) increases with decrease in temperature.
To obtain P-type Si semiconductor, we need to dope pure Si with
(a) Aluminum is trivalent impurity
Electrical conductivity of a semiconductor
(b) With temperature rise conductivity of semiconductors increases.
When a semiconductor is heated, its resistance
(a) With temperature rise conductivity of semiconductors increases
In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of
(d) In insulators, the forbidden energy gap is largest and it is of the order of 15 eV.
A N-type semiconductor is
(c) N-type semiconductors are neutral because neutral atoms are added during doping.
The energy band gap of Si is
(b) The energy band gap for Si=1.1 eV
The forbidden energy band gap in conductors, semiconductors and insulators are and respectively. The relation among them is
(b) In insulators, the forbidden energy gap is very large, in case of semiconductor it is moderate and in conductors the energy gap is zero.
When Ge crystals are doped with phosphorus atom, then it becomes
(c) Phosphorus is pentavalent.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.