Test on Fundamentals of Materials Science and Solid-State Physics

Question 1: Electronegativity is a measure of the tendency of an atom to repel a bonding pair of electrons.

A. Ano

B. Ne

Explanation: Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons, not repel them.

Question 2: Which of the following statements accurately describe characteristics related to band diagrams of solids according to the provided study materials?

A. Band diagrams represent the valence band and the conduction band.

B. The size of the band gap is a distinguishing feature in the band diagrams of different material types.

C. Metals are characterized by having no band gap in their band diagrams.

D. There is no difference in the band diagrams between insulators, semiconductors, and conductors.

Explanation: Band diagrams of solids represent the valence band and conduction band. The band gap is also a component represented in these diagrams. There is a difference in band diagrams between insulators, semiconductors, and conductors, primarily concerning the size of the band gap. Specifically, metals have no band gap.

Question 3: Is the arrangement of bound electric charges symmetrical in molecules that have a completely symmetrical structure?

A. Ano

B. Ne

Explanation: According to the study materials, for molecules with a completely symmetrical structure, it is stated that 'bound electric charges are arranged symmetrically'.

Question 4: Based on the provided study materials, which of the following is an example of a dipolar molecule?

A. H2

B. -O-H

C. N2

D. O2

Explanation: The study materials list -O-H, -C=O, and -OOH as examples of dipolar molecules (polar). H2, O2, and N2 are listed as examples of molecules that have a completely symmetrical structure, bound electric charges arranged symmetrically, and the center of gravity of positive charges coincide, implying they are not dipolar based on the provided distinction.

Question 5: Resistive metals are characterized by a low melting point.

A. Ano

B. Ne

Explanation: The study materials state that resistive metals have a high melting point.