Solid State Test

Directions For Questions

In crystalline solids, atoms or molecules are arranged in a regular and long range order fashion in a three dimensional pattern. These have sharp melting point, flat faces, sharp edges, bounded by well defined planes. A large number of unit cells each of which possess a definite geometry bounded by plane faces give rise to the formation of a crystal. A point at the corner of unit cell contributes for $$\dfrac 18$$ of each such point to unit cell. A point along an edge contribute for $$\dfrac 14$$ of each such point to unit cell. A body centred point contributes for $$1$$ each such points to unit cell. Co-ordination number is the number of nearest neighbours that each ion is surrounded by an oppositely charged ions. Radius of unit cell in sc, fcc and bcc is $$\displaystyle\frac{a}{2},\:\frac{a}{2\sqrt2}$$ and $$\dfrac{\sqrt3a}{4}$$, where $$a$$ is edge length of cell.

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Solid State Tes...

Question 1

0.236

0.67

0.45

0.82

Question 2

$$2.144\ g/cm^{3}$$

$$7.289\ g/cm^{3}$$

$$5.188\ g/cm^{3}$$

$$10.376\ g/cm^{3}$$

Question 3

cubic

hexagonal

orthohombic

rhombohedral

Question 4

$$0.68$$ and $$0.524$$

$$0.524$$ and $$0.68$$

$$0.48$$ and $$0.52$$

$$0.52$$ and $$0.48$$

Question 5

hcp structure

ccp structure

fcc structure

bcc structure

Question 6

$$16.5$$%

$$38$$%

$$50$$%

$$62$$%

Question 7

Ferroelectricity

Ferrielectricity

Pyroelectricity

Piezoelectricity

Question 8

$$a\sqrt {3}$$

$$\dfrac {a\sqrt {3}}{2}$$

$$\dfrac {a}{2}$$

$$\dfrac {a\sqrt {3}}{4}$$

Question 9

$$Fe^{III} [Fe^{II} Fe^{III}]O_{4}$$

$$PbO_{2}$$

$$Al_{2}O_{3}$$

$$Mn_{3}O_{4}$$

Question 10

$$1.002 \ g \ cm^{-3}$$

$$2.002 \ g \ cm^{-3}$$

$$3.002 \ g \ cm^{-3}$$

$$None$$

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