Q1. Which of the below given solids show the following properties? Electrical conductivity in solid state, Malleability, Ductility.
Options:
(A) Molecular solids
(B) Covalent network solids
(C) Ionic solids
(D) Metallic solids
Right Answer: 4 (D) Metallic solids
Q2. Packing efficiency is the ______.
Options:
(A) number of atoms in a unit cell
(B) percentage of total space occupied by spheres
(C) number of voids in a unit cell
(D) void volume
Right Answer: 2 (B) percentage of total space occupied by spheres
Q3. Which is a p-type semiconductor?
Options:
(A) Si doped with As
(B) Ge doped with Sb
(C) Si doped with P
(D) Ge doped with Ga
Right Answer: 4 (D) Ge doped with Ga
Q4. For the following cubic unit cell, what is the volume occupied?
Options:
(A) \(\frac{4}{3}\pi r^3\)
(B) \(\frac{8}{3}\pi r^3\)
(C) \(\frac{16}{3}\pi r^3\)
(D) \(\frac{2}{3}\pi r^3\)
Right Answer: 3 (C) \(\frac{16}{3}\pi r^3\)
Q5. The following figure represents ______.
Options:
(A) Frenkel defect
(B) substitutional impurity defect
(C) Schottky defect
(D) metal deficiency defect
Right Answer: 3 (C) Schottky defect
Q6. Among the following crystal systems, the one that forms two types of unit cells is ______.
Options:
(A) Triclinic
(B) Monoclinic
(C) Hexagonal
(D) Rhombohedral
Right Answer: 2 (B) Monoclinic
Q7. What type of solid is calcium fluoride?
Options:
(A) Ionic solid
(B) Molecular solid
(C) Covalent network solid
(D) Metallic solid
Right Answer: 1 (A) Ionic solid
Q8. The total numbers of voids (tetrahedral + octahedral) formed by 0.2 mol of a compound having hcp structure is:
Options:
(A) \( 1.2044 \times 10^{23} \)
(B) \( 9.033 \times 10^{23} \)
(C) \( 3.011 \times 10^{23} \)
(D) \( 3.6132 \times 10^{23} \)
Right Answer: 4 (D) \( 3.6132 \times 10^{23} \)
Q9. In simple cubic close packed structure, the coordination number of each sphere is ______.
Options:
(A) 2
(B) 6
(C) 8
(D) 12
Right Answer: 2 (B) 6
Q10. If the edge length of a bcc unit cell is \( 4.10 \times 10^{-8} \, \text{cm} \), what will be the approximate radius of the atom present in it?
Options:
(A) \( 2.0 \times 10^{-8} \, \text{cm} \)
(B) \( 1.4 \times 10^{-8} \, \text{cm} \)
(C) \( 5.3 \times 10^{-8} \, \text{cm} \)
(D) \( 1.8 \times 10^{-8} \, \text{cm} \)
Right Answer: 4 (D) \( 1.8 \times 10^{-8} \, \text{cm} \)
Q11. Frenkel defect is observed in ______.
Options:
(A) AgCl and CaF\(_2\)
(B) NaCl and KCl
(C) AgBr and NaCl
(D) KCl and CaF\(_2\)
Right Answer: 1 (A) AgCl and CaF\(_2\)
Q12. Which of the following is INCORRECT statement?
Options:
(A) Metal deficiency defect is possible only in compounds of metals that show variable oxidation states.
(B) Ni\(_{0.97}\)O\(_{1.0}\) represents metal excess defect.
(C) NaCl shows yellow colour due to the formation of F-centre.
(D) In metal excess defect, the crystal of NaCl has excess Na.
Right Answer: 2 (B) Ni\(_{0.97}\)O\(_{1.0}\) represents metal excess defect.
Q13. An elemental solid shows the following defect. Due to this defect, ______.
Options:
(A) the total mass of substance increases without increasing volume
(B) the total mass of substance decreases without increasing volume
(C) density of the substance decreases
(D) density of the substance remains the same
Right Answer: 1 (A) the total mass of substance increases without increasing volume
Q14. At T (K), copper (atomic mass = 63.5 u) has fcc unit cell structure with edge length of \( x \) Å. What is the approximate density of Cu in g cm\(^{-3}\) at that temperature? (\( \text{NA} = 6.0 \times 10^{23} \, \text{mol}^{-1} \))
Options:
(A) \(\frac{42.3}{x^3}\)
(B) \(\frac{4.23}{x^3}\)
(C) \(\frac{423}{x^3}\)
(D) \(\frac{212}{x^3}\)
Right Answer: 3 (C) \(\frac{423}{x^3}\)
Q15. Which theory is useful in explaining the electrical conductivity in conductors and semiconductors?
Options:
(A) Pauli’s exclusion principle
(B) Avogadro’s theory
(C) Band theory
(D) Kinetic theory
Right Answer: 3 (C) Band theory
Q16. If a ccp structure has \(\frac{N}{2}\) tetrahedral voids, then the number of octahedral voids is ______.
Options:
(A) N
(B) \(\frac{N}{2}\)
(C) 2N
(D) \(\frac{N}{4}\)
Right Answer: 4 (D) \(\frac{N}{4}\)
Q17. Which of the following is ferromagnetic material?
Options:
(A) Dioxygen
(B) Chromium(IV) oxide
(C) Benzene
(D) Dihydrogen monoxide
Right Answer: 2 (B) Chromium(IV) oxide
Q18. Which of the following elements is a semiconductor?
Options:
(A) Na
(B) Al
(C) Fe
(D) Ge
Right Answer: 4 (D) Ge
Q19. Which theory is useful in explaining the electrical conductivity in conductors and semiconductors?
Options:
(A) Pauli’s exclusion principle
(B) Avogadro’s theory
(C) Band theory
(D) Kinetic theory
Right Answer: 3 (C) Band theory
