Choose the only false statement from the following. (a) In conductors the valence and conduction bands overlap. (b) Substances with energy gap of the order of 10 eV are insulators. (c) The resistivity of a semiconductor increases with increase in temperature. (d) The conductivity of a semiconductor increases with increase in temperature.

Answer: (c). (a) True: in conductors the bands overlap. (b) True: Eg ~ 10 eV is far above 3 eV, so such substances are insulators. (c) False: as T rises more electron-hole pairs form, so resistivity of a semiconductor decreases. (d) True: conductivity increases with temperature. So the false statement is (c).

Choose the only false statement from the following. | NEET 2005 (AIPMT)

Q18NEET 2005 · AIPMTEasy

Energy Bands in Solids

Choose the only false statement from the following.

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Answer: (c)

(a) True: in conductors the bands overlap.
(b) True: $E_g \sim 10\text{ eV}$ is far above $3\text{ eV}$ , so such substances are insulators.
(c) False: as $T$ rises more electron-hole pairs form, so resistivity of a semiconductor decreases.
(d) True: conductivity increases with temperature.
So the false statement is (c).

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Energy Bands in Solids question from NEET 2005 (AIPMT)

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