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Choose the right answer. If the atoms or molecules in a solid are periodic at regular intervals of distance in three dimensions, then the solid is known as a Crystalline solid (c) Liquid Crystal (b) Amorphous solid (d) Semi-Crystalline solid. 2. Amorphous solids have an irregular structure. (a) Regular (b) Linear (c) Irregular (d) None of these. 3. Which of the following is not an amorphous material? (a) Glass (b) Plastic (c) NaCl (d) Rubber. 4. Repeatable entity of a crystal structure is known as (a) Crystal (b) Lattice (c) Unit cell (d) Miller indices. 5. Atomic packing factor is (a) Distance between two adjacent atoms (b) Area fraction of atoms on a plane (c) Volume fraction of atoms in a unit cell (d) None of these. 6. The coordination number of a crystalline solid is the number of atoms in a unit cell (b) number of nearest neighbors of an atom (c) number of voids in a unit cell (d) None of these. 7. The fraction of total volume occupied by the atoms present in a simple cubic unit cell is a x/3 b x/6 c x/3v2 d/4. 8. The percentage of free space in a body-centered cubic unit cell is (a) 32% (b) 35% (c) 28% (d) 20%. 9. A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is (a) 144 pm (b) 204 pm (c) 288 pm (d) 408 pm. 10. The axial relationship of a monoclinic crystal system is given as aa=b=c babc ca=bc 1 dab=c.

          Choose the right answer. If the atoms or molecules in a solid are periodic at regular intervals of distance in three dimensions, then the solid is known as a Crystalline solid (c) Liquid Crystal (b) Amorphous solid (d) Semi-Crystalline solid.
2. Amorphous solids have an irregular structure. (a) Regular (b) Linear (c) Irregular (d) None of these.
3. Which of the following is not an amorphous material? (a) Glass (b) Plastic (c) NaCl (d) Rubber.
4. Repeatable entity of a crystal structure is known as (a) Crystal (b) Lattice (c) Unit cell (d) Miller indices.
5. Atomic packing factor is (a) Distance between two adjacent atoms (b) Area fraction of atoms on a plane (c) Volume fraction of atoms in a unit cell (d) None of these.
6. The coordination number of a crystalline solid is the number of atoms in a unit cell (b) number of nearest neighbors of an atom (c) number of voids in a unit cell (d) None of these.
7. The fraction of total volume occupied by the atoms present in a simple cubic unit cell is a x/3 b x/6 c x/3v2 d/4. 
8. The percentage of free space in a body-centered cubic unit cell is (a) 32% (b) 35% (c) 28% (d) 20%.
9. A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is 408 pm. The diameter of the metal atom is (a) 144 pm (b) 204 pm (c) 288 pm (d) 408 pm.
10. The axial relationship of a monoclinic crystal system is given as aa=b=c babc ca=bc 1 dab=c.

q1choose the right answer l if the atoms or molecules in a solid are periodical at regular intervals of distance in three dimensionsthen the solid is known as a crystalline solid c liquid cr 67305

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