Imperfections In Solids Semiconductors
High-Yield Trend
Questions 6 MCQs
The appearance of colour in solid alkali metal halides is generally due to:
1. F-centres.
2. Schottky defect.
3. Frenkel defect.
4. Interstitial positions.
Silicon gives p-type of semiconductor on doping with:
1. Germanium.
2. Arsenic.
3. Selenium.
4. Boron.
The correct statement regarding defects in a crystalline solid is:
| 1. | Schottky defects have no effect on the density of crystalline solids. |
| 2. | Frenkel defects decrease the density of crystalline solids. |
| 3. | Frenkel defect is a dislocation defect. |
| 4. | Frenkel defect is found in halides of alkaline metals. |
The incorrect statement among the following is -
| 1. | Density decreases in case of crystals with Schottky's defect. |
| 2. | NaCl(s) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal. |
| 3. | Frenkel defect is favoured in those ionic compounds in which sizes of cations and anions have large difference. |
| 4. | has non stoichiometric metal excess defect. |
A compounds that can show both, Frenkel as well as Schottky defects is -
1. AgBr
2. AgI
3. NaCl
4. ZnS
| Assertion (A): | In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from its unit cells. |
| Reason (R): | In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality. |
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Preparing Imperfections In Solids Semiconductors for NEET
Imperfections In Solids Semiconductors is a specific sub-topic that frequently appears in the NEET examination. Understanding the underlying principles and practicing targeted questions is key to mastering this concept.
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