Covalent Bonds and Material Properties Quiz
Covalent Bonds and Material Properties Quiz
Test your knowledge of materials science with our comprehensive quiz! This quiz covers various aspects of covalent bonds, crystalline structures, and the mechanical properties of materials.
Join us and explore topics including:
- The nature of bonding in materials
- Properties of crystalline and amorphous structures
- Energy-related properties of materials
- Mechanical testing and its significance
1- Covalent bond chatacterized by
A. High thermal conductivity
B. Weak bond
C. directional
D. All of the above
2. The oredered arrangement of atoms in three dimensions is called
A.non crystalline
B. Semi crystalline
C. Amorphous structure
D. Crystalline structure
3.weak bonding leads to
A. Increase hardness and melting point
B.decrease hardness and melting point
C. Incresse hardness and decrease melting point
4- Displacive transformation characterized by one of the following
A. Break down of atomic bonding
B.slow transformation
C. Being accompanied with thermal expansion
D.all of the above
5- Crystalline solids are characterized by having
A-high internal energy
B- melting range
C- specific shape
D-random arrangement
6- The number atoms in face centered cubic system (f.c.c) are
A. One atom
B. Two atoms
C. Three atoms
D. Four atoms
7- The stress at which the material begins to function on plastic manner is
A. Porportional limit
B. High modulus of elasticity
C. Yield strength
D. Ultimate strength
8-The following are energy related property
A. hardness
B. Fatigue limit
C. Ultimate strength
D. toughness
9- Any internal force that is exerted throughout any unit area of a structure that resists an external force applied to that area is:
A- modulus of elasticity
B- strain
C- impact strength
D- stress
10- The total work or energy required to stress a material to its proportional limit is
A- resilience
B- toughness
C- brittleness
D-ultimate strength
11-The brittle materials are characterized by
A- high plastic deformation
B- high fracture toughness
C-fracture away from porportional limit
D- fracture by crack propagation
12-Restoration with high modulus of elasticity
A- can be used in thick sections
B- can not bd used in thin section
C- can be used in thin section
D- can not be used in thick section
13- Transverse strength used to test
A- denture base resin
B- long span bridge
C- both of the above
D- non of the above
14- Which of the following properties can not be determined from stress strain curve
A- porportional limit
B- resiliencd
C- toughness
D- hardness
15- acrylic resin teeth are less resilient than porcelain teeth
A- true
B-false
16-toughness is the energy required to stress the material under sudden load
A-true
B-false
17- The zirconia added to porcelain to increases the fracture toughness
A-true
B-false
18- Indirect tensile test is used to measure the tensile strength of dental amalgam
A- true
B- false
19- Hardness is surface property which cant be determined from stress strain curve T
A-true
B-false
20- Creep of amlgam take place with stress above the proportional limit or elastic limit
A- true
B- false
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