Questions in semiconductor

Select	Question
	The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is
	For a crystal system, $a = b = c$, $\alpha = \beta = \gamma \ne 90^o$, the system is
	Biaxial crystal among the following is
	The temperature coefficient of resistance of a conductor is
	Potassium has a $bcc$ structure with nearest neighbour distance 4.525 Å. Its molecular weight is $39$. Its density in $kg/m^3$ is
	The expected energy of the electrons at absolute zero is called
	In a triclinic crystal system
	Metallic solids are always opaque because
	In which of the following ionic bond is present
	Which of the following materials is non crystalline

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