SOLID STATE-1
1. Which of the following statements about amorphous solids is incorrect?
(a) They melt over a range of temperature (b) They are anisotropic
(c) There is no orderly arrangement of particles (d) They are rigid and incompressible
2. Which of the following statement is not true about amorphous solids ?
(a) On heating they may become crystalline at certain temperature.
(b) They may become crystalline on keeping for long time.
(c) Amorphous solids can be moulded by heating.
(d) They are anisotropic in nature.
3. Which of the following is not a characteristic property of solids?
(a) Intermolecular distances are short. (b) Intermolecular forces are weak.
(c) Constituent particles have fixed positions. (d) Solids oscillate about their mean positions.
4. Most crystals show good cleavage because their atoms, ions or molecules are
(a) weakly bonded together (b) strongly bonded together
(c) spherically symmetrical (d) arranged in planes
5. Which of the following is not a crystalline solid?
(a) KCl (b) CsCl (c) Glass (d) Rhombic S
6. Which of the following is an amorphous solid ?
(a) Graphite (C) (b) Quartz glass (SiO2) (c) Chrome alum (d) Silicon carbide (SiC)
7. “Crystalline solids are anisotropic in nature. What is the meaning of anisotropic in the given statement?
(a) A regular pattern of arrangement of particles which repeats itself periodically over the entire crystal.
(b) Different values of some of physical properties are shown when measured along different directions in the
same crystals.
(c) An irregular arrangement of particles over the entire crystal.
(d) Same values of some of physical properties are shown when measured along different directions in the
same crystals.
8. A crystalline solid
(a) changes abruptly from solid to liquid when heated (b) has no definite melting point
(c) undergoes deformation of its geometry easily (d) has an irregular 3-dimensional arrangements
9. Which of the following is not a characteristic of a crystalline solid ?
(a) Definite and characteristic heat of fusion.
(b) Isotropic nature.
(c) A regular periodically repeated pattern of arrangement of constituent particles in the entire crystal.
(d) A true solid
10. Which one of the following is non-crystalline or amorphous?
(a) Diamond (b) Graphite (c) Glass (d) Common Salt
11. In face-centred cubic lattice, a unit cell is shared equally by how many unit cells
(a) 2 (b) 4 (c) 6 (d) 8
12. The number of atoms per unit cell of bcc structure is (a) 1 (b) 2 (c) 4 (d) 6
13. How many space lattices are possible in a crystal?
(a) 23 (b) 7 (c) 230 (d) 14
14. Existence of a substance in more than one solid modification is known as
(a) isomorphism (b)polymorphism (c)Amorphism (d)Allotropy
15. Solid methane is
(a) molecular solid (b) Ionic solid (c) covalent solid (d) ionic solid
16. An example of covalent solid is (a)Si (b) Al (c) NaF (d) Ar
17 Among highest melting point is exhibited by
(a) Molecular solid (b) Covalent solid (c) metallic solid (d) ionic solid
18. The crystal system of a compound with unit cell dimensions a = 0.387, b = 0.387 and c = 0.504 nm and α =
ß = 90° and γ = 120° is
(a) Cubic (b) Hexagonal (c) Orthorhombic (d) rhombohedral
19. The unit cell of a particular type is defined by three vectors a,b,c the vectors are mutually perpendicular to
each other but a bc.The crystal structure is
(a) Triclinic (b) tetragonal (c) Orthrhombic (d) monoclinic
20. Graphite cannot be classified as
(a) conducting solid (b) network solid (c) covalent solid (d) ionic solid
21. Wax is an example of
(a) Ionic crystal (b) Covalent crystal (c) Metallic crystal (d) Molecular crystal
22. A compound formed by elements A and B crystallises in the cubic structure where A atoms are at comers
of a cube and B atoms are at face centres. The formula of the compound is
(a) AB3 (b) A2B (c) AB2 (d) A2B3
23. The hardest substance among the following is
(a) Be2C (b) Graphite (c) Titanium (d) SiC (e) B4C
