What type of solid is silica?

Which of the following is an example of a metallic crystalline solid?

Which among the following solids is a non-polar solid?

Which of the following is not true about the amorphous solids?

How is it proven that glass is a supercooled liquid?

For amorphous solids,select the correct option using $T$ (True) or $F$ (False) for the following statements:
$(1)$ They soften over a range of temperature.
$(2)$ Their physical properties like electrical conductivity and thermal conductivity are the same in all directions.
$(3)$ The arrangement of their particles is disordered.
$(4)$ They are hard and are less affected by pressure.