1. What is a photovoltaic substance?
2. What is Rank of crystal?
3. Can NaCl can have CsCl structure ?
4. What do you mean by tetrahedral voids.
5. What is range of conductivity of conductor? 6. What are superconductors?
7. What are normal and inverse spinals?
8. What are ferrites? What type of structure do they possess?
9. What are silicates ?
10. Why NaCl has extended octahedral structure ? 11. What is General formula for Normal Spinal Structure ?
12. Why does AgBr show both Schottky and Frenkel Defects?
13. What is Curie point?
14. When does cleavage can be possible?
15. What makes a glass different from a solid such as Quartz? Under what condition Quartz could be converted into Glass?
16. What is doping? Why it is done?
17. Why Fe3O4 becomes paramagnetic at 8500 K?
18. What are 12-16 and 13-15 compounds?
19. Although pure silicon is an insulator, then how does it behave as a semiconductor on heating?
20. Define dissociation in crystal.
21. Ionic solid, inspite of being made up of ions, do not conduct electricity.Explain
22. Explain why uncharged atoms or molecules never crystallize in a simple cubicstructure.
23. Solids with F-centre are paramagnetic. Explain.
24. What do you mean by Polymorphism?
25. What happens when a ferromagnetic substance is subjected to high temperature
AAN RAJ 