MSE 250 EXAM 1 (1-5,9 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

MSE 250 EXAM 1 (1-5,9 UPDATED ACTUAL QUESTIONS
AND CORRECT ANSWERS

Question:
1. The central tenet of Materials Science and Engineering is to determine the inter-relationships between:
Answer:
Structure-Processing-Properties

Question:
2. The four important classes of materials relevant to this class include
Answer:
Ceramic, Metal, Polymer, Semiconductor

Question:
3. Which class of material is generally associated with the highest density values at room temperature?
Answer:
Metals

Question:
4. Which of the following is the best example of material processing? Glassy, Amorphous, Crystalline,
Extrusion
Answer:
Extrusion

Question:
5. A material is observed to have properties such as good flexibility, low density, good ductility, and a low
electrical conductivity. Select the class of material which is best suited for the above-mentioned material.
Answer:
Polymer

Question:
6. Which of the following is the best related to material structure? Glassy, Sintering, Forging, Brittle
Answer:
Glassy

Question:
7. Materials have driven advancements in our society (fill in the blank) Stone age ö Bronze age ö
____________ ö Silicon age
Answer:
Iron Age

Question:
8. For each material, fill in its material class number in the middle column of blanks (points). Titanium
Titania Teflon

, Answer:
Metal, Ceramic, Polymer

Question:
9. Select the 4 quantum numbers (n, l, ml, ms) for ANY 2 electrons in the 4f state: (CHOOSE all the
options that apply) (-4)32(-1/2) 430(1/2) 423(1/2) 43(-2)(-1/2)
Answer:
430(1/2) 43(-2)(-1/2)

Question:
10. How many electrons can occupy orbitals with n=4, l=3?
Answer:
14

Question:
11. How many permitted l values are there for n=4?
Answer:
Four

Question:
12. An orbital is:
Answer:
A region where the probability of finding an electron is high

Question:
13. According to ________________________, no two electrons can have the same set of n, l, ml, ms
quantum numbers.
Answer:
Pauli exclusion principle

Question:
14. Aufbau Principle
Answer:
An electron occupies the lowest-energy orbital that can receive it

Question:
15. Hund's Rule
Answer:
states that single electrons with the same spin must occupy each equal-energy orbital before additional
electrons with opposite spins can occupy the same orbitals

Question:
16. Briefly cite the main differences between ionic, covalent, and metallic:
Answer:
Ionic bonds- due to large electronegativity differences and electron transfer, strong bonding covalent- due
to electron sharing between atoms, strong bonding metallic- forms electron cloud of electrons to bond,
weaker bonding