Class 12 Chemistry Ch-1 Solid State MCQs Exam 2027 New

💁 Ankit Raj

📅 26/02/2026

Class 12 Chemistry Ch-1 Solid State MCQs Exam 2027

Class 12 Chemistry Ch-1 Solid State MCQs Exam 2027 Details: नीचे दिए गए सभी Questions Bihar Board परीक्षा 2027 के लिए “Very Very Important Multiple Choice Questions (MCQs) Objective” (अत्यंत महत्वपूर्ण प्रश्न) हैं। इन सभी Class 12th Chemistry /रसायन विज्ञानं ) = रसायन विज्ञानं भाग-1 (English Medium) Book Chapter-1 Solid State का Questions का Solve का वीडियो Youtube और Website पर Upload किया है।

Class 12 Chemistry Ch-1 Solid State MCQs Exam 2027

Unit 1: The Solid State – Topic-wise Practice Sheet (140 MCQs)

Topic 1: Classification of Solids (Crystalline & Amorphous)

  1. Which of the following is a non-crystalline (amorphous) solid? [BSEB, 2020 A]

    Or, Which of the following is an amorphous solid? [BSEB, 2017 A, 2019 C]

    (A) Graphite (C)

    (B) Quartz Glass ($SiO_2$)

    (C) Chrome Alum

    (D) Silicon Carbide (SiC)

  2. What is Glass? [Exam Year 2026]

    (A) A liquid

    (B) A crystalline solid

    (C) A supercooled liquid

    (D) None of these

  3. Which of the following is a crystalline solid? [BSEB, 2020 A]

    (A) Diamond

    (B) Glass

    (C) Rubber

    (D) None of these

  4. Which of the following is NOT a property of a crystalline solid? [Exam Year 2026]

    (A) Isotropic (same properties in different directions)

    (B) Sharp melting point

    (C) Definite geometric shape

    (D) High intermolecular forces

  5. Which of the following is an example of an amorphous solid? [BSEB, 2021 A]

    (A) NaCl

    (B) ZnS

    (C) Glass

    (D) SiC

  6. An example of a non-crystalline solid is: [BSEB, 2021 A]

    (A) Diamond

    (B) Graphite

    (C) Salt

    (D) Rubber

  7. Which of the following is not correct for crystalline solids? [Exam Year 2026]

    (A) They melt at a definite temperature

    (B) They are called ‘true solids’

    (C) They are isotropic

    (D) They have clear cleavage

  8. Which of the following substances shows anisotropy?

    (A) Glass

    (B) Barium Chloride ($BaCl_2$)

    (C) Rubber

    (D) Plastic

  9. Which of the following is not a crystalline solid? [BSEB, 2025 A]

    (A) KCl

    (B) CsCl

    (C) Glass

    (D) Rhombic Sulphur

  10. The ability of a substance to exist in more than one crystalline form is called:

    (A) Isomorphism

    (B) Polymorphism

    (C) Isotropy

    (D) None of these

Topic 2: Crystal Lattice and Unit Cells

  1. The number of basic crystal systems is: [BSEB, 2017 C, 2022 C, 2023 A]

    (A) 4

    (B) 7

    (C) 14

    (D) 8

  2. How many ‘Bravais Lattices’ can exist in a crystal? [BSEB, 2022 A]

    (A) 7

    (B) 14

    (C) 230

    (D) 32

  3. The number of Bravais lattices in a cubic crystal is: [BSEB, 2022 A]

    (A) 3

    (B) 1

    (C) 4

    (D) 14

  4. How many types of space lattices are possible in a crystal? [BSEB, 2025 A]

    (A) 23

    (B) 7

    (C) 230

    (D) 14

  5. The number of atoms in a Body-Centered Cubic (BCC) unit cell is: [BSEB, 2025 A]

    (A) 2

    (B) 3

    (C) 4

    (D) 12

  6. The number of spheres per unit cell in a Face-Centered Cubic (FCC) lattice is: [BSEB, 2022 A]

    (A) 1

    (B) 2

    (C) 3

    (D) 4

  7. The number of atoms in an hcp unit cell is: [BSEB, 2021 A]

    (A) 4

    (B) 6

    (C) 12

    (D) 7

  8. The number of lattice points in a Body-Centered Cubic (BCC) unit cell is: [Exam Year 2026]

    (A) 4

    (B) 3

    (C) 2

    (D) 1

  9. The number of atoms present in a Face-Centered Cubic (FCC) unit cell is: [Exam Year 2026]

    (A) 2

    (B) 3

    (C) 4

    (D) 12

  10. In a crystal system AB, $a \neq b \neq c$ and $\alpha = \beta = \gamma = 90^\circ$ represents: [BSEB, 2017 C]

    (A) Triclinic

    (B) Orthorhombic

    (C) Cubic

    (D) Monoclinic

  11. Which type of crystal has the maximum number of Bravais lattices? [Exam Year 2026]

    (A) Cubic

    (B) Triclinic

    (C) Orthorhombic

    (D) Tetragonal

  12. For a ‘Triclinic’ crystal system, which is correct:

    (A) $a = b = c$

    (B) $a \neq b \neq c$ and $\alpha \neq \beta \neq \gamma \neq 90^\circ$

    (C) $\alpha = \beta = \gamma = 90^\circ$

    (D) $a = b \neq c$

  13. The total number of lattice points in a Face-Centered Cubic (FCC) system is:

    (A) 4

    (B) 8

    (C) 14

    (D) 6

  14. In the ‘Cubic’ basic crystal system, the axial length is:

    (A) $a = b = c$

    (B) $a = b \neq c$

    (C) $a \neq b \neq c$

    (D) $\alpha = \beta = \gamma \neq 90^\circ$

  15. The axial angles in a cubic crystal are:

    (A) $\alpha = \beta = \gamma = 90^\circ$

    (B) $\alpha = \beta = 90^\circ, \gamma = 120^\circ$

    (C) $\alpha \neq \beta \neq \gamma \neq 90^\circ$

    (D) $\alpha = \gamma = 90^\circ, \beta \neq 90^\circ$

  16. How many atoms are there in an fcc lattice? [Exam Year 2026]

    (A) 1

    (B) 2

    (C) 3

    (D) 4

  17. In the ‘Hexagonal’ system of Bravais lattice, the lattice type is:

    (A) Primitive (P) only

    (B) P and BCC

    (C) P and FCC

    (D) P, FCC and BCC

  18. The number of atoms in a Simple Cubic unit cell is:

    (A) 1

    (B) 2

    (C) 4

    (D) 8

  19. For a face-centered unit cell (fcc), what fraction of an atom is shared with a neighboring unit cell?

    (A) 1/2

    (B) 1/4

    (C) 1/8

    (D) 1/6

  20. In a face-centered cubic lattice, one atom is shared with how many other unit cells?

    (A) 2

    (B) 4

    (C) 6

    (D) 8

Topic 3: Packing Efficiency & Radius Relationship

  1. The packing efficiency in a Body-Centered Cubic (bcc) lattice is: [BSEB, 2018 A]

    (A) 52.4%

    (B) 68%

    (C) 74%

    (D) 80%

  2. The packing efficiency in a Face-Centered Cubic (fcc) cell is: [BSEB, 2021 A]

    (A) 74%

    (B) 68%

    (C) 52%

    (D) 50%

  3. The packing efficiency of a Simple Cubic unit cell is: [Exam Year 2026]

    (A) 20%

    (B) 30%

    (C) 52.4%

    (D) 62%

  4. The percentage of empty space in a Body-Centered Cubic unit cell is: [BSEB, 2025 A]

    (A) 32

    (B) 34

    (C) 28

    (D) 20

  5. The percentage of free space in a bcc unit cell is: [BSEB, 2018 A]

    (A) 32%

    (B) 34%

    (C) 28%

    (D) 30%

  6. The percentage of free space in a Face-Centered Cubic (fcc) unit cell is: [Exam Year 2026]

    (A) 32%

    (B) 26%

    (C) 48%

    (D) 74%

  7. The relationship between the edge length ‘$a$‘ and atomic radius ‘$r$‘ for fcc is: [BSEB, 2021 A]

    (A) $a = 2r$

    (B) $a = 4\sqrt{3}r$

    (C) $a = 2\sqrt{2}r$

    (D) $a = \frac{\sqrt{3}}{2}r$

  8. In BCC structure, the relation between atomic radius $r$ and edge length $a$ is: [Exam Year 2026]

    (A) $r = \frac{a}{2}$

    (B) $r = \frac{\sqrt{3}a}{4}$

    (C) $r = \frac{a}{2\sqrt{2}}$

    (D) $r = \frac{\sqrt{2}a}{4}$

  9. In hcp structure, the packing fraction is: [BSEB, 2018 C]

    (A) 0.68

    (B) 0.74

    (C) 0.54

    (D) 0.50

  10. The percentage of free (void) space in hcp unit cell is:

    (A) 74%

    (B) 68%

    (C) 26%

    (D) 32%

  11. The packing efficiency of fcc unit cell is: [Exam Year 2026]

    (A) 54%

    (B) 64%

    (C) 74%

    (D) 84%

  12. The packing efficiency of bcc unit cell is: [Exam Year 2026]

    (A) 58%

    (B) 68%

    (C) 78%

    (D) 88%

  13. The packing efficiency of Simple Cubic Lattice is: [BSEB, 2021 A]

    (A) 52%

    (B) 68%

    (C) 74%

    (D) 88%

  14. The packing fraction for Body-Centered Cubic (BCC) cell is: [Exam Year 2026]

    (A) 0.42

    (B) 0.53

    (C) 0.68

    (D) 0.82

  15. The relation between edge length ($a$) and atomic radius ($r$) in fcc unit cell is:

    (A) $r = a/2$

    (B) $r = \sqrt{3}a/4$

    (C) $r = a/2\sqrt{2}$

    (D) $r = a$

  16. The packing coefficient for Body-Centered Cubic cell is: [Exam Year 2026]

    (A) 0.42

    (B) 0.53

    (C) 0.68

    (D) 0.82

  17. The correct relation between octahedral void radius ($r$) and sphere radius ($R$) is:

    (A) $r = 0.414 R$

    (B) $r = 0.225 R$

    (C) $r = 0.732 R$

    (D) $r = 1.15 R$

  18. The radius ratio ($r/R$) of tetrahedral void is:

    (A) 0.414

    (B) 0.225

    (C) 0.732

    (D) 0.155

  19. The number of tetrahedral voids per unit cell in fcc structure is:

    (A) 4

    (B) 8

    (C) 6

    (D) 12

  20. An octahedral void is surrounded by how many spheres? [BSEB, 2022 A, 2024 A]

    (A) 4

    (B) 6

    (C) 8

    (D) 12

Topic 4: Coordination Number & Crystal Structure

  1. What is the coordination number of $Cl^-$ ions in NaCl crystal? [Exam Year 2026]

    (A) 4

    (B) 6

    (C) 8

    (D) 12

  2. The coordination number of sodium in $Na_2O$ is: [BSEB, 2015 A]

    (A) 6

    (B) 4

    (C) 8

    (D) 2

  3. If a metal crystallizes in hcp structure, the coordination number of the metal is: [BSEB, 2018 A, 2023 A]

    (A) 12

    (B) 8

    (C) 4

    (D) 6

  4. The coordination number of the body-centered atom in a cubic structure is: [BSEB, 2024 A]

    (A) 4

    (B) 6

    (C) 8

    (D) 9

  5. $K$ (Potassium) crystallizes in $bcc$ lattice, its coordination number will be: [Exam Year 2026]

    (A) 4

    (B) 6

    (C) 8

    (D) 12

  6. In Face-Centered Cubic (fcc) system, the coordination number is: [Exam Year 2026]

    (A) 12

    (B) 8

    (C) 6

    (D) 4

  7. The crystal structure of CsCl is: [Exam Year 2026]

    (A) scc

    (B) fcc

    (C) bcc

    (D) None of these

  8. The lattice of Sodium Chloride is: [Exam Year 2026]

    (A) Hexagonal

    (B) Octahedral

    (C) Tetrahedral

    (D) Square planar

  9. The structure of NaCl crystal is: [BSEB, 2024 A]

    (A) Hexagonal close packing

    (B) Face-Centered Cubic

    (C) Square planar

    (D) Body-Centered Cubic

  10. The coordination number in Body-Centered Cubic structure is: [Exam Year 2026]

    (A) 8

    (B) 6

    (C) 4

    (D) 12

  11. Which of the following metals has a coordination number of 8? [Exam Year 2026]

    (A) K

    (B) Fe

    (C) Zn

    (D) Au

  12. The coordination number of $Cs^+$ in $CsCl$ crystal is: [BSEB, 2023 A]

    (A) 6

    (B) 8

    (C) 12

    (D) 4

  13. What is the coordination number of $Zn^{2+}$ ions in $ZnS$ (Zinc blende)?

    (A) 4

    (B) 6

    (C) 8

    (D) 12

  14. The coordination number of $K^+$ in $KCl$ crystal is:

    (A) 4

    (B) 6

    (C) 8

    (D) 12

  15. In a diamond crystal, each carbon atom is connected to other carbon atoms. Their number is:

    (A) 2

    (B) 4

    (C) 3

    (D) 1

  16. In an ionic compound, ‘A’ ions are at the corners of the unit cell and ‘B’ ions are at the centers of the faces. The formula will be:

    (A) $AB$

    (B) $A_3B$

    (C) $AB_3$

    (D) $A_2B$

  17. In the unit cell of an ionic compound, ‘A’ ions are at the corners and ‘B’ ion is at the center of the cube. The formula will be: [Exam Year 2026]

    (A) AB

    (B) $A_2B$

    (C) $AB_2$

    (D) $A_7B$

  18. Which of the following pairs contains tetrahedral void and octahedral void respectively? [BSEB, 2018 A]

    (A) bcc and fcc

    (B) hcp and simple cubic

    (C) hcp and ccp

    (D) bcc and hcp

  19. In $CsCl$ structure, the arrangement of $Cl^-$ ions is:

    (A) Simple Cubic

    (B) $fcc$

    (C) $bcc$

    (D) $hcp$

  20. Copper crystallizes in $fcc$ lattice. The number of atoms per unit cell is:

    (A) 1

    (B) 2

    (C) 4

    (D) 8

Topic 5: Crystal Defects (Schottky & Frenkel)

  1. Due to Schottky defect, the density of a solid: [Exam Year 2026]

    (A) Increases

    (B) Decreases

    (C) Becomes zero

    (D) None of these

  2. Due to which defect ‘F-centres’ are formed in a crystal? [Exam Year 2026]

    (A) Schottky defect

    (B) Frenkel defect

    (C) Metal excess defect

    (D) Interstitial defect

  3. Which defect is found in $AgBr$ crystal? [Exam Year 2026]

    (A) Schottky only

    (B) Frenkel only

    (C) Both Schottky and Frenkel

    (D) None of these

  4. Schottky defect occurs in a crystal when: [Exam Year 2026]

    (A) Cations are missing from the lattice

    (B) Anions are missing from the lattice

    (C) Equal number of cations and anions are missing

    (D) Density of the crystal increases

  5. In which type of defect does the density of crystal remain unchanged? [BSEB, 2023 A]

    (A) Schottky defect

    (B) Frenkel defect

    (C) Metal excess defect

    (D) Impurity defect

  6. Frenkel and Schottky defects are: [Exam Year 2026]

    (A) Nuclear defects

    (B) Crystal defects

    (C) Atomic defects

    (D) Molecular defects

  7. Which of the following defects causes a decrease in the density of crystal? [BSEB, 2022 A]

    (A) Frenkel

    (B) Schottky

    (C) Interstitial

    (D) F-centre

  8. When an electron is trapped by an anion vacancy in a crystal, the defect is: [BSEB, 2021 A]

    (A) Schottky defect

    (B) Frenkel defect

    (C) F-centre

    (D) None of these

  9. Frenkel defect is generally found in: [Exam Year 2026]

    (A) $AgBr$

    (B) $ZnS$

    (C) $AgI$

    (D) All of these

  10. In which of the following is Frenkel defect found? [Exam Year 2026]

    (A) Sodium Chloride

    (B) Graphite

    (C) Silver Chloride

    (D) Diamond

  11. Due to Schottky defect, the density of a crystal: [BSEB, 2024 A]

    (A) Increases

    (B) Decreases

    (C) Remains same

    (D) None of these

  12. If a cation is present in the interstitial site in a solid lattice, it is: [BSEB, 2018 A]

    (A) Frenkel defect

    (B) Schottky defect

    (C) Metal deficiency defect

    (D) Impurity defect

  13. Due to ‘F-centre’, crystals: [Exam Year 2026]

    (A) Become colored

    (B) Become insulators

    (C) Increase density

    (D) None of these

  14. In $AgCl$ crystal, the migration of $Ag^+$ ion from its position to an interstitial site is: [Exam Year 2026]

    (A) Schottky defect

    (B) Frenkel defect

    (C) Impurity defect

    (D) Metal excess defect

  15. Electrons trapped in anionic vacancies due to metal excess defect are called:

    (A) Protons

    (B) F-centres

    (C) Valence electrons

    (D) Core electrons

  16. Which of the following contains both Schottky and Frenkel defects? [BSEB, 2022 A]

    (A) $NaCl$

    (B) $ZnS$

    (C) $AgBr$

    (D) $AgI$

  17. The defect in which some ions leave the lattice and move to interstitial sites is called:

    (A) Schottky

    (B) Frenkel

    (C) Impurity

    (D) None of these

  18. How many types of point defects are there in a crystal?

    (A) 2

    (B) 3

    (C) 4

    (D) 5

  19. Schottky defect is usually observed in:

    (A) $AgCl$

    (B) $NaCl, KCl, CsCl$

    (C) $ZnS$

    (D) $CaF_2$

  20. $ZnO$ turns yellow on heating, the reason is:

    (A) Schottky defect

    (B) Frenkel defect

    (C) Metal excess defect

    (D) Impurity defect

Topic 6: Magnetic & Electrical Properties

  1. Which of the following substances is antiferromagnetic? [Exam Year 2026]

    (A) $Fe_3O_4$

    (B) $CrO_2$

    (C) $MnO$

    (D) $Fe$

  2. Which of the following oxides shows ferromagnetism? [BSEB, 2020 A]

    (A) $CrO_2$

    (B) $MnO_2$

    (C) $Fe_3O_4$

    (D) $V_2O_5$

  3. Which of the following is a ferromagnetic substance? [BSEB, 2022 A]

    (A) NaCl

    (B) $Fe_3O_4$

    (C) $O_2$

    (D) $N_2$

  4. Which of the following oxides shows electrical properties like metals? [BSEB, 2017 A]

    (A) $SiO_2$

    (B) MgO

    (C) $SO_2(s)$

    (D) $CrO_2$

  5. Which of the following is an example of a Ferrimagnetic substance? [Exam Year 2026]

    (A) $Fe_3O_4$

    (B) $MnO$

    (C) $CrO_2$

    (D) $Fe$

  6. What type of semiconductor is formed when Arsenic (As) is added to Silicon (Si)? [Exam Year 2026]

    (A) p-type

    (B) n-type

    (C) Insulator

    (D) None of these

  7. The number of valence electrons in the impurity added to silicon to make p-type semiconductor is: [Exam Year 2026]

    (A) 3

    (B) 5

    (C) 4

    (D) 2

  8. The element used in the manufacturing of transistor sets is: [Exam Year 2026]

    (A) Al

    (B) Si

    (C) Cu

    (D) Zn

  9. Which of the following is a ferromagnetic substance? [Exam Year 2026]

    (A) Fe

    (B) Cu

    (C) NaCl

    (D) MnO

  10. In p-type semiconductors, the main charge carriers are:

    (A) Electrons

    (B) Holes

    (C) Photons

    (D) Protons

  11. To obtain n-type semiconductor, the impurity added to silicon should have valence electrons:

    (A) 3

    (B) 2

    (C) 5

    (D) 1

  12. According to band theory in solids, the gap between valence band and conduction band in conductors is:

    (A) Zero (Overlapping)

    (B) Very large

    (C) Very small

    (D) None of these

  13. The semiconductor material used in solar cells is:

    (A) $C$

    (B) $Si$

    (C) $Sn$

    (D) $Pb$

  14. The conductivity of semiconductors on increasing temperature:

    (A) Increases

    (B) Decreases

    (C) Remains constant

    (D) Becomes zero

  15. $CrO_2$ is used in making magnetic tapes because it is:

    (A) Ferromagnetic

    (B) Antiferromagnetic

    (C) Paramagnetic

    (D) Diamagnetic

  16. Which of the following oxides is antiferromagnetic?

    (A) $TiO_2$

    (B) $VO_2$

    (C) $Cr_2O_3$

    (D) $MnO_2$

  17. What type of magnetic behavior does $MnO$ show? [Exam Year 2026]

    (A) Ferromagnetic

    (B) Paramagnetic

    (C) Antiferromagnetic

    (D) Ferrimagnetic

  18. Which of the following solids is the best conductor of electricity?

    (A) $Si$

    (B) $Ge$

    (C) $Ag$

    (D) $Mg$

  19. Which of the following solids can behave as conductor, insulator, and semiconductor?

    (A) Silicon (Si)

    (B) Copper (Cu)

    (C) $NaCl$

    (D) $SO_2$

  20. The hybridization of carbon in graphite is:

    (A) $sp$

    (B) $sp^2$

    (C) $sp^3$

    (D) $dsp^2$

Topic 7: Miscellaneous & Formulae

  1. The formula for the density ($\rho$) of a crystal is: [Exam Year 2026]

    (A) $\rho = \frac{ZM}{a^3 N_A}$

    (B) $\rho = \frac{a^3 N_A}{ZM}$

    (C) $\rho = \frac{Z N_A}{a^3 M}$

    (D) $\rho = \frac{M N_A}{a^3 Z}$

  2. The Bragg equation is: [Exam Year 2026]

    (A) $n\lambda = d\sin\theta$

    (B) $n = 2d\sin\theta$

    (C) $n\lambda = 2d$

    (D) $n\lambda = 2d\sin\theta$

  3. Diamond is which type of crystal? [BSEB, 2024 A]

    (A) Ionic crystal

    (B) Covalent crystal

    (C) Molecular crystal

    (D) Metallic crystal

  4. Which of the following is a network (lattice) solid? [Exam Year 2026]

    (A) $SO_2$ (solid)

    (B) $I_2$

    (C) Diamond

    (D) $H_2O$ (ice)

  5. Which of the following is a covalent solid? [BSEB, 2023 A]

    (A) Iron

    (B) Diamond

    (C) Sodium Chloride

    (D) Copper

  6. Crystals are of: [BSEB, 2019 C]

    (A) Four types

    (B) Three types

    (C) Seven types

    (D) All of these

  7. The Miller indices of two parallel planes of a crystal are: [Exam Year 2026]

    (A) Same

    (B) Different

    (C) Zero

    (D) None of these

  8. In which of the following ionic compound crystals will the distance be maximum? [Exam Year 2026]

    (A) LiF

    (B) CsF

    (C) CsI

    (D) LiI

  9. Crystallization of potassium occurs in or the structure of NaCl Crystal is: [BSEB, 2017 C]

    (A) Face-Centered Cubic lattice

    (B) Body-Centered Cubic lattice

    (C) Simple Cubic lattice

    (D) Triclinic crystal

  10. How many $NaCl$ formula units are in the unit cell of sodium chloride? [BSEB, 2021 A]

    (A) 2

    (B) 4

    (C) 6

    (D) 8

  11. Solid $CO_2$ (dry ice) is an example of: [Exam Year 2026]

    (A) Ionic solid

    (B) Covalent solid

    (C) Molecular solid

    (D) Metallic solid

  12. Iodine ($I_2$) molecules are held together in crystal lattice by which force?

    (A) London forces

    (B) Dipole-dipole attraction

    (C) Covalent bond

    (D) Ionic bond

  13. The number of carbon atoms in one unit cell of diamond is:

    (A) 4

    (B) 8

    (C) 6

    (D) 12

  14. Which of the following is a hydrogen-bonded molecular solid?

    (A) $H_2O$ (ice)

    (B) $HCl$

    (C) $CH_4$

    (D) $SO_2$

  15. In which structure does Sodium ($Na$) crystallize?

    (A) $fcc$

    (B) $bcc$

    (C) $sc$

    (D) $hcp$

  16. The distance between carbon atoms in diamond is:

    (A) 135 pm

    (B) 154 pm

    (C) 120 pm

    (D) 100 pm

  17. The mass ($M$) used for calculating the density of a crystal is:

    (A) Molar mass

    (B) Mass of one atom

    (C) $Z \times M$

    (D) $M / N_A$

  18. The main component of Quartz is:

    (A) $SiO_4$ tetrahedron

    (B) $SiC$

    (C) $Al_2O_3$

    (D) $CaF_2$

  19. A solid $AB$ has $NaCl$ type structure. If the radius of $A$ is 100 pm, the probable radius of $B$ ion will be:

    (A) 225 pm

    (B) 241 pm

    (C) 150 pm

    (D) 115 pm

  20. What is the structure of graphite? [BSEB, 2024 A]

    (A) Tetrahedral

    (B) Hexagonal

    (C) Cubic

    (D) None of these

  21. The number of tetrahedral voids in a face-centered cubic unit cell with similar atoms is: [BSEB, 2022 C]

    (A) 8

    (B) 4

    (C) 6

    (D) 12

  22. A metal with high density crystallizes in BCC structure, the relation between atomic radius $r$ and edge length $a$ is:

    (A) $r = \frac{a}{2}$

    (B) $r = \frac{\sqrt{3}a}{4}$

    (C) $r = \frac{a}{2\sqrt{2}}$

    (D) $r = \frac{\sqrt{2}a}{4}$

  23. In a face-centered cubic lattice, one unit cell is shared with how many unit cells: [Exam Year 2026]

    (A) 8

    (B) 4

    (C) 2

    (D) 6

  24. Zn crystallizes from its molten state into hcp structure. Its coordination number will be:

    (A) 4

    (B) 8

    (C) 12

    (D) 6

  25. Which of the following substances is a conductor of electricity but is not ionic even in solid state? [Exam Year 2026]

    (A) Diamond

    (B) Graphite

    (C) Common salt

    (D) Iodine

  26. The ability of a substance to exist in more than one crystalline form is called:

    (A) Isomorphism

    (B) Polymorphism

    (C) Isotropy

    (D) None of these

  27. The number of atoms $Z$ in a body-centered cubic cell is:

    (A) 1

    (B) 2

    (C) 3

    (D) 4

  28. The packing fraction of BCC structure is:

    (A) 0.52

    (B) 0.68

    (C) 0.74

    (D) 0.48

  29. Which of the following solids is amorphous? [BSEB, 2017 A, 2019 C]

    (A) NaCl

    (B) Graphite

    (C) Glass

    (D) SiC

  30. In NaCl crystal, the coordination number ratio is:

    (A) 4:4

    (B) 6:6

    (C) 8:8

    (D) 12:12

Bihar Board Class 12th के (Chemistry/रसायन विज्ञानं ) = रसायन विज्ञानं ‘भाग-1 (Englsih Medium) Book Chapter-1 Solid State के Exam 2027 MCQs Questions Answer Key

Q. No.AnsQ. No.AnsQ. No.AnsQ. No.Ans
1(B)36(B)71(B)106(C)
2(C)37(C)72(C)107(C)
3(A)38(B)73(C)108(C)
4(A)39(B)74(C)109(A)
5(C)40(C)75(B)110(B)
6(D)41(C)76(B)111(A)
7(C)42(B)77(B)112(D)
8(B)43(A)78(C)113(B)
9(C)44(C)79(D)114(C)
10(B)45(C)80(C)115(B)
11(B)46(C)81(B)116(A)
12(B)47(A)82(A)117(A)
13(A)48(B)83(A)118(C)
14(D)49(B)84(B)119(A)
15(A)50(B)85(B)120(B)
16(D)51(B)86(C)121(C)
17(B)52(B)87(B)122(A)
18(C)53(A)88(B)123(B)
19(C)54(C)89(B)124(A)
20(B)55(C)90(C)125(B)
21(C)56(A)91(C)126(B)
22(B)57(C)92(A)127(A)
23(C)58(B)93(B)128(A)
24(A)59(B)94(D)129(B)
25(A)60(A)95(A)130(B)
26(D)61(A)96(B)131(A)
27(A)62(B)97(A)132(B)
28(A)63(A)98(B)133(D)
29(A)64(B)99(A)134(C)
30(C)65(B)100(B)135(B)
31(B)66(C)101(C)136(B)
32(A)67(A)102(A)137(B)
33(C)68(C)103(B)138(B)
34(A)69(A)104(A)139(C)
35(A)70(C)105(A)140(B)

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