$MnO$ is $:$

Classify the following materials into superconductors,conductors,semiconductors,and insulators: $Cu$,$Al$,$Si$,$Ge$,glass,Teflon,$Au$,$Pt$,$CuO$ (at low temperature),graphite,carbon black,and alloys at low temperature.

Which of the following elements has a simple cubic lattice structure in its solid state?

Which one of the following is the most correct statement?

Match the column $A$ (type of crystalline solid) with the column $B$ (example for each type).

$P$. Molecular solid	$i$. $SiC$
$Q$. Ionic solid	$ii$. $Mg$
$R$. Metallic solid	$iii$. $H_2O$
$S$. Network solid	$iv$. $MgO$

In $n$-type semiconductors,the conduction of electricity is primarily due to which of the following?