Worksheet on Defects of Crystalline Solids





A crystaline solid is a solid material which contains atoms, ions or molecules. They are arranged in repeating pattern extending in all three spatial dimensions.

There are three types of Crystalline solid defects. They are listed below:
1. Planar defects
2. Line defects
3. Point defects

Here, you can find some questions related to crystalline solids and their answers:

Questions:

1. Which among the following is likely to have Schottky defect?

(a)    ZnS

(b)   AgBr

(c)    NaCl

(d)   none of these

 

2.  ZnO is white when cold and yellow when heated. It is due to the development of:

(a)    metal excess defect

(b)   Frenkel defect

(c)    Schottky defect

(d)   both (b) and (c)

 

3. On heating some polar crystals, weak electric current is produced. It is termed as:

(a)    superconductivity

(b)   piezoelectricity

(c)    photoelectric current

(d)   none of these

 

4. Mark the correct statement:

(a)    CsCl crystal shows Schottky defect

(b)   Crystals having F-centres are coloured and paramagnetic

(c)    Photo-sensitivity of AgBr is due to the presence of Frenkel defect in its crystals

(d)   All of these are correct

 

5. Which substance will conduct the current in the solid state?

(a)    Diamond

(b)   Graphite

(c)    Sodium chloride

(d)   Iodine

 

6. The substance which possesses zero resistance at 0K is called:

(a)    Super conductor

(b)   Insulator

(c)    Conductor

(d)   Semiconductor

 

Answers:

1.(c)     2. (a)     3. (b)     4. (d)     5. (b)     6. (a)



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