7. If fraction intercepts of a plane on x,y,z axes are 1,1/2,1/3 respectively, the miller indices of the plane are a) 321 b) 123 c) 632 d) 10.50.33 8. The effective number of lattice points per unit cell in the lattice of CsCl is and that in the lattice of NaCl is a) two, four b) one, two c) two, one d) one, four 9. In body centered cubic (BCC) lattice possible location of tetrahedral voids are a) (1/2,1/2,0) b) (1/2,1/4,0) c) (1/2,0,0) d) (1/2,0,1/4) 10. Which of the following bonds have the highest bond energy. a) van der Waal's forces b) covalent bonds c) metallic bonds d) ionic bonds 11. In Bragg's equation =2dsin, the angle is the angle between a) plane normal and the incident beam b) transmitted and diffracted beam c) half the angle between transmitted and diffracted beam d) none of the above 12. Which the following relation is correct. a) Cristal = Lattice + Basis b) Lattice = Cristal + Basis c) Lattice = Cristal d) Basis = Cristal 13. The unit cell has a=5A,b=4A,c=6A,===90. What is the space lattice for this unit cell? a) Triclinic b) Cubic c) Monoclinic d) Orthorhombic 14. Which of the following materials has/have cubic coordination of both cations and anions? e) NaCl f) CsCl g) ReO3 h) CaFa2