Conductors, Insulators, Semiconductors — Prelims Questions

Which of the following statements correctly describes the energy band structure of a conductor?

A material has a forbidden energy gap of $0.9 \text{ eV}$. How would its electrical conductivity likely change if its temperature is increased from $27^circ\text{C}$ to $127^circ\text{C}$?

At absolute zero (0 K), a pure semiconductor behaves as:

Which of the following materials is characterized by a completely filled valence band and a completely empty conduction band separated by a large energy gap ($E_g > 3 \text{ eV}$)?

Which of the following is NOT a characteristic of semiconductors?

If the energy gap of a material is $E_g = 7.0 \text{ eV}$, what type of material is it, and what would be its approximate resistivity at room temperature?