300+ TOP MCQs on Solid State and Answers

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MCQs on Solid State :

1. How many unit cells are divided equally in a face-centred cubic lattice?
(A) 2
(B) 4
(C) 6
(D) 8

Answer

Answer: (c)

2. 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 irregular 3-dimensional arrangements.

Answer

Answer: (a)

3. In a simple cubic, body-centred cubic and face-centred cubic structure, the ratio of the number of atoms present is respectively
(A) 8:1:6
(B) 1:2:4
(C) 4:2:1
(D) 4:2:3

Answer

Answer: (b)

4. Na and Mg crystallize in crystals of bcc and fcc form respectively and then the amount of Na and Mg atoms present in their respective crystal unit cells is:
(A) 4 and 2
(B) 9 and 14
(C) 14 and 9
(D) 2 and 4

Answer

Answer: (d)

5. Ferrous oxide has a cubic structure and each unit cell edge is 5.0A^o. Assuming the oxide density is 4.0g / cm³, the amount of Fe²⁺ and O^2- ions in each unit cell will then be
(A) four Fe²⁺ and four O^2-
(B) two Fe²⁺ and four O^2-
(C) four Fe²⁺ and two O^2-
(D) three Fe²⁺ and three O^2-

Answer

Answer: (a)

6. Each of the following solids shows, the Frenkel defect except
(A) ZnS
(B) AgBr
(C) AgI
(D) KCl

Answer

Answer: (d)

7. Schottky defect in a crystal is observed when
(A) The ion leaves its normal position and occupies an interstitial location
(B) the unequal number of cation and anions are missing from the lattice
(C) the density of the crystal increases.
(D) an equal number of cations and anions are missing from the lattice.

Answer

Answer: (d)

8. Copper crystalline in FCC with a unit cell length of 361pm. What is the radius of a copper atom?
(A) 128pm
(B) 157pm
(C) 181pm
(D) 108pm

Answer

Answer: (a)

9. The total no of voids in 0.5 mol of a compound forming hexagonal close-packed structure are:
(A) 6.022 × 10²³
(B) 3.011 × 10²³
(C) 9.033 × 10²³
(D) 4.516 × 10²³

Answer

Answer: (c)

10. For the orthorhombic system, axial ratios are a ≠ b ≠ c and the axial angles are:
(A) α = β = γ ≠ 90^o
(B) α ≠ β ≠ γ ≠ 90^o
(C) α = β = γ = 90^o
(D) α ≠ β ≠ γ = 90^o

Answer

Answer: (c)