# Worksheet on Features of Solids

Solids are classified into 2 groups. They are Crystalline solid and Amorphous solid.

Crystaline solids includes those solids which has regular and nearly regular crystalline structures. Example of crystalline solid is sugar.

Amorphous solids are those solids which are not organized in a definite lattice pattern. Example of Amorphous solids are glass, plastic and gel.

Questions:

1. Which of the following is not a feature of solids?

(a)    definite mass and volume

(b)   frequent fluidity

(c)    rigidity

(d)   definite shape

2. Which of the following is characteristic of amorphous solids?

(a)    have non-orderly or very short range order arrangement

(b)   show isotropy

(c)    have tendency to undergo irregular cleavage

(d)   All of these

3. Which of the following is not a property of crystalline solids?

(a)    show

(b)   have sharp melting point

(c)    have anisotropic nature

(d)   have long range orderly arrangement

4. Which of the following contains non crystalline solids pair?

(a)    diamond, wood

(b)   glass, table salt

(c)    wood, glass

(d)   sucrose, glass

5. Which is a molecular solid?

(a)    $I_2$

(b)   wax

(c)    ice

(d)   all of these

6. Which type of solids are generally good conductors of electricity here:

(a)    metallic

(b)   covalent

(c)    ionic

(d)   molecular

7.  Among the following which is crystalline solids?

(a)    glass

(b)   wood

(c)    sucrose

(d)   sand

8. Which of the following has hexagonal structure?

(a)    diamond

(b)   sodium chloride

(c)    graphite

(d)   both (a) and (c)

9. The total number of crystal systems and the number of Bravais lattices are respectively:

(a)    7, 7

(b)   7, 14

(c)    14, 14

(d)   9, 16

10. Out of seven crystal systems how many can have body centered unit cell?

(a)    4

(b)   2

(c)    3

(d)   5

11. Among the following unit cells given below, which has highest symmetry?

(a)    cubic

(b)   monoclinic

(c)    hexagonal

(d)   orthorhombic

12. In which of the following crystal systems the end-centred unit cell exists?

(a)    monoclinic

(b)   triclinic

(c)    cubic

(d)   all of these

13. If A, B, C are unequal and $\alpha, \beta, \gamma$ are unequal and not $90^0$ . It represents:

(a)    triclinic system

(b)   tetragonal

(c)    monoclinic

(d)   orthorhombic

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

6. (a)     7. (c)     8. (c)     9. (b)     10. (c)

11. (a)     12. (a)     13. (a)

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