This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 1 Solid State – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which one of the following statements about packing in solids is incorrect? A) Coordination number in bcc mode of packing is 8. B) Coordination number in hcp mode of packing is 12. C) Void space in hcp mode of packing is 32%. D) Void space is ccp mode of packing is 26%. Show Answer Correct Answer: C) Void space in hcp mode of packing is 32%. 2. How many spheres or units for BCC (body centr cubic system) A) 2. B) 4. C) 1. D) 5. Show Answer Correct Answer: A) 2. 3. Given an alloy of Cu, Ag and Au in which Cuatoms constitute the CCP arrangement. If thehypothetical formula of the alloy isCu$_{4}$Ag$_{3}$Au . What are the probable locationsof Ag and Au atoms- A) Ag-all Tetrahedral voids; Au-allOctahedral voids. B) Ag-3/8th Tetrahedral voids; Au-1/4thOctahedral voids. C) Ag-1/2 Octahedral voids; Au-1/2Tetrahedral voids. D) Ag-all Octahedral voids; Au-alltetrahedral voids. Show Answer Correct Answer: B) Ag-3/8th Tetrahedral voids; Au-1/4thOctahedral voids. 4. In which industry is solid state welding commonly used for producing aircraft components? A) Automotive. B) Aerospace. C) Construction. D) Shipbuilding. Show Answer Correct Answer: B) Aerospace. 5. It is also called as dislocation defect A) Frenkel defect. B) Schottky defect. C) All the above. D) None of the above. Show Answer Correct Answer: A) Frenkel defect. 6. At ..... a normal conductor become a super conductor. A) Normal temperature. B) Curie temperature. C) Critical temperature. D) Room temperature. Show Answer Correct Answer: C) Critical temperature. 7. To avoid bends diver use oxygen diluted with ..... gas because it is less soluble in blood. A) Nitrogen. B) Helium. C) CO2. D) None of the above. Show Answer Correct Answer: B) Helium. 8. What is the coordination number in a square close packed structure in two dimensions A) 8. B) 6. C) 4. D) 2. Show Answer Correct Answer: C) 4. 9. 10 nm is equal to A) 10$^{-8}$m. B) 10$^{-7}$m. C) 10$^{-9}$m. D) 10$^{-10}$m. Show Answer Correct Answer: A) 10$^{-8}$m. 10. The space lattice of graphite is A) Cubic. B) Tetragonal. C) Rhombic. D) Hexagonal. Show Answer Correct Answer: D) Hexagonal. 11. What is the role of electrons in the conduction band? A) Electrons in the conduction band enable electrical conduction by being free to move and carry charge. B) Electrons in the conduction band are bound to atoms and do not move. C) Electrons in the conduction band absorb energy and become neutral. D) Electrons in the conduction band only exist at absolute zero temperature. Show Answer Correct Answer: A) Electrons in the conduction band enable electrical conduction by being free to move and carry charge. 12. Hexagonal closest-packed structure and a cubic closest expected to have for a given element would be expected to have A) The same coordination number. B) The same packing fraction. C) Both (a) and (b) (. D) None. Show Answer Correct Answer: C) Both (a) and (b) (. 13. BCC lattice has a co-ordination number of: A) 8. B) 4. C) 6. D) 12. Show Answer Correct Answer: A) 8. 14. For a constant temperature, Boyle's law states that A) The pressure of a fixed amount of gas is directly proportional to the volume of the gas. B) The pressure of a fixed amount of gas is inversely proportional to the volume of the gas. C) The pressure of a fixed amount of gas is independent of the volume of the gas. D) None of the above. Show Answer Correct Answer: B) The pressure of a fixed amount of gas is inversely proportional to the volume of the gas. 15. The miller indices of the plane, whose intercepts along the axes are (a, 2b, 3c) is ..... A) (1, 2, 3). B) (3, 2, 1). C) (2, 3, 6). D) (6, 3, 2). Show Answer Correct Answer: D) (6, 3, 2). 16. If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur? A) P-type. B) N-type. C) Both a and b. D) None of two. Show Answer Correct Answer: B) N-type. 17. The smallest repeating unit in a crystal lattice is known as ..... A) Lattice plane. B) Unit cell. C) Bravais lattice. D) Coordination number. Show Answer Correct Answer: B) Unit cell. 18. Silicon doped with arsenic is A) P-type semiconductor. B) N-type semiconductor. C) Like a metallic conductor. D) An insulator. Show Answer Correct Answer: B) N-type semiconductor. 19. The edge length of a face-centered cubic (FCC) unit cell is 400 pm. What is the atomic radius? A) 100 pm. B) 141 pm. C) 173 pm. D) 282 pm. Show Answer Correct Answer: B) 141 pm. 20. What term is used to describe this model of metallic bonding? A) Electron sea model. B) VSEPR. C) Valence Bond Theory. D) Molecular Orbital Theory. Show Answer Correct Answer: A) Electron sea model. 21. If R is the radius of sphere in the close packed arrangement and r is the radius of tetrahedral void, then A) R =0.225 r. B) R = 0.225 R. C) R = 0.414 R. D) R = 0.414 r. Show Answer Correct Answer: B) R = 0.225 R. 22. Defect causing decrease in density A) Schottky. B) Frenkel. C) F-centre. D) Metal Excess. Show Answer Correct Answer: A) Schottky. 23. What role do phonons play in superconductivity? A) They mediate the attractive interaction between electrons. B) They increase electrical resistance. C) They have no effect on superconductivity. D) None of the above. Show Answer Correct Answer: A) They mediate the attractive interaction between electrons. 24. Find the incorrect statement regarding Frenkel defect: A) Density of the crystal significantly decreases due to Frenkel defect. B) Frenkel defects are observed where cations and anions are of comparable size. C) Compounds having low coordination number generally show this type of defect number. D) Both (1) and (2). Show Answer Correct Answer: D) Both (1) and (2). 25. What is the effect of Frenkel defect on the density of ionic solids? A) The density of the crystal increases. B) The density of the crystal decreases. C) The density of the crystal remains unchanged. D) There is no relationship between density of a crystal and defect present in it. Show Answer Correct Answer: C) The density of the crystal remains unchanged. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 1 Solid State Quiz 1Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 2Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 3Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 4Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 5Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 7Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 8Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 9Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 10Class 12 Chemistry (Part I) Chapter 1 Solid State Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books