11. Polystyrene is a
12. The unit of polarization is the same as that of
13. An insulator is one whose
14. Which one of the following statement is correct? Ionic crystals are-
15. In He-Ne laser, population inversion is achieved by
16. The resistivity of a metal is a function of temperature because
17. The bending of bimetallic strips during rise in temperature is due to difference in their:
18. Aluminium ore is known as-
19. The magnetization 'M' of a superconductor in a field of H is
20. Diamagnetic materials possess
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