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Video 1: Why Study the Course?

1、【单选题】In the first video of Module 1, the examples used to demonstrate the successful application of materials include ________

A、high-speed railways

B、Shenzhou-11 spacecraft

C、Chinese dragon

D、All of the above

2、【单选题】Which of the following characteristics is not desirable for the materials used to make the helmets?

A、Great heat resistance

B、Great impact resistance

C、High density

D、Great strength

3、【单选题】Which of the following materials belong to advanced materials？

A、Functional materials

B、Smart materials

C、Biomaterials

D、All of the above

4、【判断题】The smart materials can respond to the environmental changes.

A、正确

B、错误

Video 2：MSE and materials selection

1、【单选题】_______ is the rule in materials selection.

A、Compromise

B、Cost effectiveness

C、In-service conditions

D、Ideal combination of properties

2、【单选题】There are ____ components involved in the discipline of materials science and engineering.

A、three

B、four

C、five

D、six

3、【多选题】The term materials science and engineering combine both _______ and ________.

A、materials science

B、materials engineering

C、materials technology

D、materials processing

Video 3: The Materials Cycles

1、【单选题】Which of the following is not the approaches used to minimize any possible adverse impacts on the environment at all stages of the materials cycle?

A、life cycle analysis

B、life cycle assessment

C、green design

D、design for assembly

2、【多选题】Which of the following step(s) belongs (or belong) to materials cycles?

A、Extracting raw materials

B、Creating bulk materials

C、Fabricating products and system

D、Recycling and disposal

3、【判断题】The materials cycle is a system that involves interactions and exchanges among materials, energy, and the environment.

A、正确

B、错误

Video 4: Family of Materials

1、【单选题】Which of the following is not ceramics?

A、Porcelain

B、Magnesium

C、Glass

D、Structural clay

2、【判断题】Advanced materials include semiconductors, biomaterials, smart materials and nanomaterials.

A、正确

B、错误

Module 1 Question1

Module 1 Quiz

1、【单选题】The term of ______ describes the behavior of materials when subjected to some external force or condition.

A、application

B、processing

C、property

D、structure

2、【单选题】Materials engineering involves, on the basis of ______ correlations, designing or engineering the structure of a material to produce a predetermined set of properties.

A、structure-nature

B、composition-structure

C、structure–property

D、composition-processing

3、【单选题】MSE involves the generation and application of knowledge relating _____ to their _______ and uses, having interdisciplinary and multidisciplinary characteristics.

A、composition of materials, properties

B、composition, structure and processing of materials, properties

C、composition, structure and processing of materials, application

D、structure of materials, application

4、【单选题】___________means that a material, after completing its life cycle in one component, could be reprocessed and re-used in another component, then re-enter the materials cycle again.

A、Recyclable material

B、Biodegradeble material

C、Renewable material

D、None of the above

5、【单选题】__________ is a concept that places recycling at the beginning or design stage of the materials cycle to ensure that waste going into municipal landfills will be minimized.

A、design for assembly

B、design for disassembly

C、green design

D、input/output inventory

6、【多选题】In selecting a material for a specific application, which of the following issues should be considered?

A、Cost

B、Availability

C、Processability

D、Recyclability

7、【多选题】Materials are _________.

A、the matter of the universe

B、these substances having properties that make them useful in structures and machines

C、these substances having properties that make them useful in products and systems

D、these substances having properties that make them useful in structures, machines, devices, products, and systems.

8、【判断题】Life cycle analysis is used to improve the environmental performance of products.

A、正确

B、错误

9、【判断题】Design for assembly emphasis easy product assembly by robots and other automated equipment

A、正确

B、错误

Video 1: Primary Bonds

1、【单选题】The bonding type of Aluminum is

A、Ionic bondingIonic bonding

B、Metallic bonding

C、Covalent bonding

D、Hydrogen bondi 广东开放大学 ng

Video 2:Secondary Bonds

1、【单选题】O2 is a molecule

A、Polar

B、Non-Polar

C、No

D、No

2、【判断题】Because of hydrogen bonding, hydrogen fluoride (HF) has a higher boiling point than hydrogen chloride (HCl)

A、正确

B、错误

Video 3 Crystalline and Amorphous Solids

1、【单选题】Amorphous metals develop their miscrostructure as a result of _______

A、Dendrites

B、Directional solidification

C、Slip

D、Extremely rapid cooling

2、【多选题】A crystalline solid has

A、 Long-range order

B、Distinctive X-ray pattern

C、 Irregular arrangement of atoms

D、No

Video 4: Unit Cells and Space Lattices

1、【判断题】When stacked together, the unit cells form the whole crystal

A、正确

B、错误

2、【判断题】The periodicity of any single crystal can be described by an equivalent space lattice

A、正确

B、错误

Video 5: Crystal Systems

1、【判断题】In crystallography, there are eight crystal systems and 14 Bravais lattices

A、正确

B、错误

Video 7: Point Defects

1、【判断题】Steel is an interstitial solid solution with impurity carbon atoms in iron crystal lattice

A、正确

B、错误

Video 8: Line Defects and Dislocation Movement

1、【判断题】Dislocations make it easier for slip or plastic deformation to occur.

A、正确

B、错误

2、【判断题】A ductile metal becomes harder and stronger as it is subjected to cold working

A、正确

B、错误

Video 9: Area Defects

1、【单选题】If a crystalline solid consists of a number of grains, such material is called

A、A Polycrystalline Solid

B、An Amorphous Solid

C、A Single Crystal

D、No

2、【判断题】Internal atoms have missing bonds, so, they are in higher energy states than surface atoms

A、正确

B、错误

Video10: Phase diagram

1、【单选题】A homogeneous part or aggregation of material that differs from another part due to difference in structure

A、Liquidus

B、Solidus

C、Solution

D、Phase

2、【多选题】When an alloy is at a temperature above the solidus but below the liquidus, it coexists as ___________

A、Liquid

B、Gas

C、Solid

D、Plasma

3、【判断题】The Gibbs rule represents a criterion for the number of phases that coexist within a system at equilibrium

A、正确

B、错误

Module 2 Question 2

Module 2 Quiz

1、【单选题】The key word to describe the nature of covalent bond is of electrons

A、sharing

B、swarming

C、transferring

D、spinning

2、【单选题】The key word to describe the nature of ionic bond is of electrons

A、sharing

B、swarming

C、transferring

D、spinning

3、【单选题】Amorphous solids have only order in the arrangement of constituent particles

A、long-range

B、short-range

C、medium-range

D、None of the above

4、【单选题】If the unit cell contains an identical component in the center of the cube in addition to those at the corners of the cube, then it is called _________

A、Simple Cubic

B、Face Centered Cubic

C、Body Centered Cubic

D、None of the above

5、【单选题】When impurity atoms are found in the voids or interstices among the host atoms, it is called a/an solid solution.

A、Substitutional

B、Vacancy

C、Interstitial

D、None of the above

6、【单选题】When impurity atoms replace the host atoms, it is called a/an solid solution

A、 Substitutional

B、Vacancy

C、Interstitial

D、None of the avove

7、【单选题】Which one is the curve that represents the temperatures at which solidification begins?

A、Solidus

B、Liquidus

C、Cooling curve

D、Heating curve

8、【判断题】Primary bonding is the forces within a molecule, while secondary bonding is the forces between molecules

A、正确

B、错误

9、【判断题】In Polymers, bonds inside the long chain molecules are secondary bonding, bonds among the chains are covalent bonding

A、正确

B、错误

10、【判断题】Long range order means the orderly arrangement of atoms extends throughout the entire material.

A、正确

B、错误

11、【判断题】If you cool molten metal at extremely rapid rate, amorphous metal can form

A、正确

B、错误

12、【判断题】Both Face-centered cubic and Hexagonal Close-packed are close-packed crystal structures

A、正确

B、错误

13、【判断题】The existence of point defects，impurity atoms, dislocations，grain boundary may all hinder the dislocation movement, hence weaken the materials

A、正确

B、错误

Video 1: Stress and Strain

1、【单选题】Which equation describes the Engineering strain?

A、

B、

C、

D、

2、【多选题】What information you can find in a stress-strain diagram?

A、Elastic modulus

B、Yield Point

C、Ultimate Strength

D、Fracture Point

Video 2: Elastic and Plastic Deformation

1、【多选题】Which of the below terms have same meaning?

A、Ultimate Strength

B、Tensile Strength

C、Yield Strength

D、Uniform Strain

2、【判断题】A material subjects to a deformation under force and can go back to its original shape. We call the material undergoes an elastic deformation.

A、正确

B、错误

Video 3:Ductility

1、【单选题】In a stress-strain diagram, which region refers to ductile property?

A、Elastic Region

B、Plastic Region

C、Elastic and Plastic Region

D、No

2、【多选题】Which statement is correct?

A、The area under which th 渝粤题库 e straight-line portion (elastic region) of the stress-strain curve is modulus of resilience

B、Modulus resilience is a measure of the energy per unit volume that the material can absorb without plastic deformation

C、Resilience tells you the capacity of a material to adsorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered

D、No

Video 4: Toughness

1、【单选题】_____is defined as a sudden application of a load confined to a localized area of a material.

A、Stretch

B、Compress

C、Punch

D、Impact

2、【多选题】Which of the below statement are correct?

A、Impact test is a typical static testing method.

B、Toughness is a measure of a material’s resistance to brittle fracture when a crack is present.

C、A material’s tensile stress tends to gradually increase with the size of the crack increases.

D、Fracture toughness is used in design to find allowable flaw size.

Video 5: Ductile-to-Brittle Transition

1、【单选题】Adding more carbon, the steel show ___transition temperature ranges.

A、Wider

B、Narrower

C、Same

D、No

2、【判断题】High temperature may change a ductile material into brittle.

A、正确

B、错误

3、【判断题】A brittle material has very little plastic deformation.

A、正确

B、错误

4、【判断题】When broken, cross-section image of a ductile material has flake-like structure.

A、正确

B、错误

Video 6：Fatigue

1、【单选题】The _____ the stress is applied to the material, the less cycle it will endure before its failure.

A、Lower

B、Higher

C、Quick

D、Slow

2、【单选题】Fatigue limits of a typical ferrous alloy is about____ tensile strength.

A、Half

B、1/3

C、1/4

D、1/5

3、【判断题】All materials have a fatigue limit.

A、正确

B、错误

Video 7: Creep

1、【多选题】Which statements about creep forming is correct?

A、A workpiece is loaded against a die or tool for a specific time

B、The load is normally applied using pressure or vacuum at temp. around 600°C

C、The process results in predetermined shapes that required little or no machining

D、No

2、【判断题】Creep happens at specific temperatures.

A、正确

B、错误

3、【判断题】The creep rate is higher at a high temperature.

A、正确

B、错误

Video 8: Hardness

1、【单选题】What is range of Mohs Scale?

A、1-10

B、1-100

C、1-1000

D、1-100%

2、【单选题】Which one represents the hardest sample of Mohs hardness?

A、Talc

B、Calcite

C、Quartz

D、Diamond

3、【多选题】Hard materials have good resistance to _____ and _____.

A、Wear

B、Impact

C、Abrasion

D、Torsion

4、【判断题】The tensile strength of steel（MPa) is about 3.4 times of that of Brinell hardness.

A、正确

B、错误

Video 9: Thermal Properties

1、【判断题】The efficiency of a material in absorbing heat is described by heat capacity

A、正确

B、错误

Video 10: Thermal Expansion

1、【判断题】Material with high bonding energy has low thermal expansion coefficient.

A、正确

B、错误

Video 11: Thermal Conductivity

1、【判断题】Polymers transmit heat mainly through free electrons.

A、正确

B、错误

Module 3 Question 3

Module 3 Quiz

1、【单选题】Which statement is correct?

A、All materials have a pronounced or obviously yield point.

B、Some materials do not have clear yield point.

C、Grey cast iron does not have yield point

D、None of above is correct

2、【单选题】_____is defined as a sudden application of a load confined to a localized area of a material.

A、Stretch

B、Compress

C、Punch

D、Impact

3、【单选题】After a certain amount of time has elapsed under constant load, the creep strain (plastic deformation) will ______.

A、decrease

B、increase

C、not change

D、be any possible value

4、【单选题】The ______ the heat capacity, the _____ the amount of heat needed to produce a temperature change.

A、larger, greater

B、larger, smaller

C、lower, greater

D、None of above is correct

5、【多选题】What are correct for describing off-set yield strength?

A、Off-set yield strength is the stress corresponding to the plastic limit.

B、It is the lowest stress at which a limited amount of plastic deformation occurs.

C、Off-set yield strength is the stress corresponding to the elastic limit.

D、If a plastic strain of 0.002 in./in. can be tolerated, the stress that produces this strain is designated as the yield strength of the material at 0.2% offset.

6、【多选题】Which statements are correct?

A、The area under which the straight-line portion (elastic region) of the stress-strain curve is modulus of resilience.

B、Modulus resilience is a measure of the energy per unit volume that the material can absorb without plastic deformation.

C、Resilience tells you the capacity of a material to adsorb energy when it is deformed elastically and then, upon unloading, to have this energy recovered.

D、None of the above statement is correct.

7、【多选题】Which of the following statements are correct?

A、The greater the modulus, the stiffer the material.

B、The stiffer the material, the higher the resistance of the material to deformation.

C、The higher the magnitude of elastic modulus, the higher the magnitude of the inter-atomic bonding forces in a material.

D、The higher the magnitude of elastic modulus, the lower the magnitude of the intermolecular bonding forces in a material.

8、【多选题】Which of the experiments are used for measuring toughness?

A、Charpy impact test

B、Izod impact test

C、Knoop Hardness

D、None of the above is correct

9、【多选题】What are the methods of applying load in a fatigue test?

A、 Constant Stress

B、Temporary Loading

C、Repetitious Stress

D、Reversal Stress

10、【多选题】What are the typical methods for penetration testing of hardness?

A、Brinell Hardness

B、Vickers Hardness

C、Rockwell Hardness

D、Mohs Hardness

11、【判断题】Ductile materials can stand large plastic deformation without fracture.

A、正确

B、错误

12、【判断题】Materials with high elastic modulus are typically soft.

A、正确

B、错误

13、【判断题】Toughness is the ability or capacity of a material to absorb energy during elastic deformation.

A、正确

B、错误

14、【判断题】A ductile material will be ductile forever.

A、正确

B、错误

15、【判断题】The maximum stress that can be sustained for a specified number of cycles without fracture is called fatigue limit.

A、正确

B、错误

16、【判断题】Many nonferrous metals, such as aluminum and other non-ferrous metals exhibit no fatigue limit.

A、正确

B、错误

17、【判断题】Creep happens at specific temperatures.

A、正确

B、错误

18、【判断题】Higher stress or higher temperature reduces the rupture time and decreases the creep rate.

A、正确

B、错误

19、【判断题】A material with high bonding energy has low thermal expansion coefficient.

A、正确

B、错误

Video1: Nature of Metals

1、【多选题】Generally, the atoms in metals are typically arranged in one of three common crystal structures: ________, ________, and________.

A、Face-centered cubic (FCC)

B、Body-centered cubic (BCC)

C、Simple cubic (SC)

D、Hexagonal close-packed (HCP)

2、【判断题】From the microstructure, atoms in metals and their alloys are arranged in a very orderly manner.

A、正确

B、错误

3、【判断题】With regard to the mechanical properties, metals are typically hard, also relatively stiff and strong when in solid state.

A、正确

B、错误

Video 2: Iron-Carbon Phase Diagram

1、【单选题】A two –phase mixture of ferrite and cementite is

A、Austenite

B、Martensite

C、Ledeburite

D、Pearlite

2、【多选题】From the iron-carbon phase diagram, which of the following phases/phase combinations is present for a steel composition of 0.7wt % C at 700°C

A、Pearlite + Cementite

B、α + Pearlite

C、α + Cementite

D、γ + Cementite

3、【判断题】The eutectic concentration of carbon is 0.76%

A、正确

B、错误

Video 3: Processing of Metal Alloys

1、【单选题】________ is usually performed after quenching

A、Tempering

B、Strain hardnening

C、Spherodizing anneal

D、Aging

2、【单选题】A thermal process to toughen the high carbon steel by providing more ductility is ______

A、Tempering

B、Spheroidizing

C、Case hardening

D、Annealing

Video 4: Ferrous Metals

1、【判断题】According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.

A、正确

B、错误

2、【判断题】Cast iron is the most widely used engineering material, and also the most recycled of all materials

A、正确

B、错误

Video 5: Nonferrous Metals

1、【多选题】Refractory metals include niobium (Nb), ________, ________, and ________

A、Zirconium

B、Molybdenum (Mo)

C、Tungsten (W)

D、Tantalum (Ta)

2、【判断题】For brasses, tin is the predominant alloying elements as substitutional impurity.

A、正确

B、错误

3、【判断题】Refractory metals are those metals which have extremely low melting temperatures

A、正确

B、错误

Video 7: Corrosion of Metals and Its Prevention

1、【单选题】For some stainless steels, when heated to a certain temperature range (_________) for a sufficiently long time, these alloys become sensitized to intergranular attack

A、300℃-600℃

B、400℃-700℃

C、500℃-800℃

D、700℃-1000℃

2、【多选题】Cathodic protection involves supplying electrons to the metal to be protected from an external source. The external source maybe be an external _______ or by__________

A、dc power source

B、Alternating Power Source

C、 A Galvanic Couple

D、Cathode

3、【判断题】Stress corrosion cracking (SCC) results from the combined action of an applied tensile stress and a corrosive environment

A、正确

B、错误

Video 8: Advanced Metals

1、【单选题】Magnetostrictive materials can convert energy into kinetic energy, or the reverse

A、Heat

B、Magnetic

C、Kinetic

D、Electric

2、【判断题】The magnetic shape memory effect results due to martensitic phase change to austenite phase at higher temperature

A、正确

B、错误

3、【判断题】Amorphous metals are non-crystalline, and have a glass-like structure. Like common glasses, amorphous metals are electrical insulators.

A、正确

B、错误

Module 4 Question 4

Module 4 Quiz

1、【单选题】All alloys that are not______ based, are called nonferrous metals

A、 Steel

B、Iron

C、Aluminum

D、Copper

2、【单选题】Which of the following do not belong to non-ferrous metal?

A、Titanium

B、Nickel

C、Stainless steel

D、Palladium

3、【单选题】Cast iron can be classified into four categories: gray cast iron, white cast iron, nodular cast iron and ______ cast iron.

A、Black

B、Yellow

C、Ductile

D、Malleable

4、【单选题】Most cast irons have a chemical composition of ______ percent carbon.

A、0–0.008

B、0.008–2.14

C、2.5–4.0

D、2.5–6.7

5、【单选题】The predominant alloying element in stainless steel is ______, which concentration should be higher than 11 wt%.

A、Chromium

B、Nickle

C、Molybdenum

D、Titanium

6、【单选题】______ is one of the principal alloying elements in stainless steels, and one major constituent in superalloys.

A、Chromium

B、Nickle

C、Molybdenum

D、Titanium

7、【单选题】Metals are good conductors of both______________

A、Electricity and magnetism

B、Electricity and heat

C、Heat and magnetism

D、Heat and light

8、【单选题】______ is believed “the most glamorous metal in the world”

A、Nickle

B、Magnesium

C、Titanium

D、Zirconium

9、【多选题】According to the composition, metal alloys are grouped into two classes: ________, and________ metals

A、White

B、Ferrous

C、Nonferrous

D、Noble

10、【多选题】Stainless steels are divided into three classes on the basis of the predominant phase constituent of the microstructure: ________, ________, or________

A、Martensitic

B、Ferritic

C、Pearlite

D、Austenitic

11、【多选题】 uses cooling in still air？

A、Stress relief annealing

B、Full anneal

C、Normalizing

D、Sphereroidizing anneal

12、【多选题】Some general corrosion protection techniques include material selection, ___________, ___________, and___________

A、Galvanic Couple

B、Design

C、Protective Coating

D、Cathodic Protection

13、【判断题】Compared with ferrous alloys, nonferrous metals are much lighter, and have lower conductivity.

A、正确

B、错误

14、【判断题】The phase diagram contained only two components is known as binary diagrams.

A、正确

B、错误

15、【判断题】Annealing and normalizing present a significant difference on the ductility of low carbon steels.

A、正确

B、错误

16、【判断题】In corrosion process, the total rate of oxidation must equal the total rate of reduction.

A、正确

B、错误

Video 1: Traditional and Advanced Ceramics

1、【单选题】Ceramics based primarily on the natural raw materials of clay and silicates are ________

A、Traditional ceramics

B、Advanced ceramics

C、Cements

D、Glass

2、【单选题】Advanced materials include , exhibit specialized properties.

A、Nature raw materials

B、Artificial raw materials

C、Pottery materials

D、All of above

Video 2: Nature of Ceramics

1、【单选题】The main source of quartz is .

A、Glass

B、Minerals

C、Clay

D、Sandstone

2、【单选题】The crystalline structure of Silicon carbide is with alternating Si and C atoms covalently bonded together

A、Cubic-like

B、Diamond-like

C、Hexagon-like

D、Layer-like

3、【单选题】Ceramics can be produced at than that of competing metal-alloy components.

A、More cost

B、More density

C、Less cost

D、Less density

Video 3: Structure of Ceramics

1、【单选题】Clay is a complex mixture of .

A、Aluminates

B、Carbides

C、Nitrides

D、Silicates

2、【判断题】Sand consists of fine particles of quartz.

A、正确

B、错误

Video 4: Porosity and Density

1、【单选题】The term describing the density of ceramics that includes its porosity and both crystalline and noncrystalline phase is_____________.

A、 Bulk density

B、Mass density

C、 Theoretical density

D、Green density

2、【多选题】 There are two factors influence the density of material.

A、Atomic weight

B、How the atoms/ions are bonded

C、Atomic size

D、 How the atoms/ions are stacked

3、【判断题】The bulk density of complex geometric parts as well as their various porosities can be determined based on Archimedes' principle.

A、正确

B、错误

Video 5: Sintering /Densification/Firing

1、【单选题】Grinding is accomplished by confining the ceramic powder, this process can be called a .

A、Ball mill

B、Mixture

C、Blending

D、Sintering

2、【多选题】Sintering furnaces usually heat ceramic compacts externally by following thermal transfer.

A、Convection

B、Radiant

C、Sinter

D、densification

3、【判断题】A major problem in ceramic processing is achieving the same properties every time when a process is repeated.

A、正确

B、错误

Video 6: Traditional and Advanced Processing

1、【单选题】Traditional processing for fabricating ceramic is .

A、Sol-Gel

B、HIP

C、Slip casting

D、Microwave sintering

2、【判断题】The firing consolidates the particles and bonds the ceramic particles together permanently.

A、正确

B、错误

Video 7: Glass

1、【单选题】The most expensive glass is .

A、Soda-lime

B、Borosilicate glass

C、Lead-alkali silica glass

D、Fused silica glass

2、【判断题】 Amorphous materials do not have clearly defined freezing or melting points as do crystalline materials.

A、正确

B、错误

Module 5 Question 5

Module 5 Quiz

1、【单选题】Advanced materials include , exhibit specialized properties.

A、Nature raw materials

B、Artificial raw materials

C、Pottery materials

D、All of above

2、【单选题】Following processing technique is not suitable for the biomicmickry or biomimetics.

A、Low pressure

B、Minimum number of steps

C、Low density

D、Low temperature

3、【单选题】The crystalline structure of Silicon carbide is with alternating Si and C atoms covalently bonded together

A、Cubic-like

B、Diamond-like

C、Hexagon-like

D、Layer-like

4、【单选题】Ceramics can be produced at than that of competing metal-alloy components.

A、 More cost

B、More density

C、 Less cost

D、Less density

5、【单选题】Following material is not sorted to silicates.

A、 Garnet

B、Feldspar

C、Quartz

D、Mullite

6、【单选题】______ refers to the network of pores that a liquid such as water can penetrate.

A、Pores

B、Open pores

C、Closed pores

D、Porosity

7、【单选题】The main driving force in sintering process is

A、the increase in surface area

B、the reduction in surface area

C、the increase in bulk density

D、the reduction in bulk density

8、【单选题】 Some flaws can occur at any of sintering stages, which consist of .

A、Structure flaws and chemical flaws

B、Physical flaws and chemical flaws

C、 Chemical flaws and composition flaws

D、Composition flaws and structure flaws

9、【单选题】In cold step, the ceramic part is formed or shaped into a preform, which called .

A、 Red part

B、Yellow part

C、Green part

D、White part

10、【单选题】_________ is considered as glass former.

A、ZnO

B、CaO

C、SiO2

D、Al2O3

11、【单选题】. Slower cooling permits some crystallization in the process, we call it ______

A、Densification

B、 Vitrification

C、 Devitrification

D、Fabrication

Video 1: What is a polymer?

1、【判断题】Nowadays, all of the polymers are synthesized artificially.

A、正确

B、错误

2、【判断题】Saturated molecules-containing more than two functional groups cannot be used to produce polymers.

A、正确

B、错误

Video 2: How large is a poly 成人学历 mer ?

1、【单选题】Number average molecular weights provide us some information related to ______.

A、Many physical properties

B、Polymerization reactions

C、No

D、No

2、【多选题】The length or size of a polymer molecule can be quantified by ________.

A、The number of repeating units linked together in a polymer chain

B、The degree of polymerization

C、Number-average molecular weight

D、Weight-average molecular weight

3、【判断题】The molecular weight distribution, PDI, could be a value near to 1, when polymers are produced by living or controlled polymerizations.

A、正确

B、错误

Video 3: How is a polymer formed?

1、【多选题】The activity of a growing radical can be destroyed by reaction with _______.

A、Initiator radical

B、Another growing chain radical

C、Transfer reaction from one radical to another

D、None of the above

2、【判断题】In condensation polymerization, two monomers, dimers, trimers, tetramers, or oligomers, can react with each other at any time.

A、正确

B、错误

3、【判断题】Through controlled/living free-radical polymerization (CRP), molecular weight distribution could be narrowed greatly, and PDI could be near to 1.

A、正确

B、错误

Video 4: What does a polymer molecule look

1、【判断题】Common polymers, such as PE, PP, PVC, PSt, nylon, and PET have linear structures.

A、正确

B、错误

2、【判断题】The formation of cross-linked structures in synthetic rubbers is usually called vulcanization.

A、正确

B、错误

3、【判断题】When the methyl group and H atom are located on opposite sides of the double bond, the polymer is a cis-isomer.

A、正确

B、错误

Video 5: Amorphous or Crystalline state of polymers

1、【多选题】Materials in solid state may be _________.

A、Solid

B、Amorphous

C、Liquid

D、Crystalline

2、【多选题】Which ones of the following are correct?

A、Trans-polyisoprene is more readily packed and crystallizable, and has properties of crystalline polymers.

B、Cis-polyisoprene is more readily packed and crystallizable, and thus has properties of crystalline polymers.

C、Trans-polyisoprene is tougher and harder than cis-polyisoprene

D、Cis-polyisoprene is tougher and harder than trans-polyisoprene

3、【多选题】Which one (s) of the following is or are correct?

A、Isotactic and syndiotactic polymers possess stereo-regular structures

B、Atactic and isotactic polymers possess stereo-regular structures

C、Isotactic and syndiotactic polymers are rigid, crystallizable, high melting, and relatively insoluble

D、Atactic polymers are rigid, crystallizable, high melting, and relatively insoluble

Video 6: Viscoelasticity

1、【判断题】Viscosity refers to the ability of a material to return to its original, initial size shape once an external load or force is removed.

A、正确

B、错误

2、【判断题】Totally elastic deformation occurs very quickly, and the strain is independent of time.

A、正确

B、错误

Video 7: Glass Transition

1、【判断题】Semicrystalline polymer is formed in a temperature range from Tg to Tm

A、正确

B、错误

2、【判断题】Polycarbonate has a lower Tg than polyethylene.

A、正确

B、错误

3、【判断题】PVC and PAN have a lower Tg than amorphous polypropylene.

A、正确

B、错误

4、【判断题】Poly(1,4-cis-butadiene) has a higher Tg than Poly(1,4-trans-butadiene) because the cis -form reduces the energy barrier for rotation of adjacent bonds.

A、正确

B、错误

Video 8: Thermoplastics and Thermosets

1、【多选题】Examples of common thermoplastic polymers include ________.

A、Polyethylene

B、Nylon

C、Phenolics

D、Polystyrene

2、【判断题】Thermoplastics are mainly prepared by addition polymerization.

A、正确

B、错误

3、【判断题】Thermoset polymers are generally harder and stronger than thermoplastics and have better dimensional stability.

A、正确

B、错误

4、【判断题】Thermosetting polymers have the distinct advantage of being chemically and thermally resistant materials used in many high-performance applications.

A、正确

B、错误

Video 9: Additives for Plastics

1、【多选题】Fillers are most often added to improve tensile strength, and ________.

A、Compressive strength

B、Cost

C、Abrasion resistance

D、Toughness

2、【多选题】Most polymers are flammable in their pure form, except _________.

A、Poly(vinyl chloride)

B、Polystyrene

C、Polytetrafluoroethylene

D、Polyimide

3、【判断题】Additives are external substances purposely added to change properties of polymers or resins.

A、正确

B、错误

Video10: Plastic Processing

1、【单选题】Polyethylene pipes can be processed by .

A、Injection

B、Extrusion

C、Compression

D、Blow molding

2、【单选题】Which plastic product is processed by injection molding?

A、

B、

C、渝粤教育 .net/D6C0FAA47CA559CF66AB65CB4B28FAD2.png?imageView&thumbnail=890x0&quality=100" style="width: 173px; height: 162px;" />

D、

3、【多选题】Which forming technique(s) could be employed to process thermosetting plastics?

A、Extrusion

B、Casting

C、Blow molding

D、 Transfer molding

Video 11: Natural rubber

1、【单选题】Which of the following chemical structure is natural rubber?

A、

B、

C、

D、

2、【多选题】Natural rubber is a kind of .

A、Thermoplastic polymers

B、Thermosetting polymers

C、Saturated polymers

D、Unsaturated polymers

3、【多选题】Which of following properties are the problem natural rubber in practical application?

A、Aging resistance

B、Chemical resistance

C、Resilience

D、Waterproof

4、【判断题】After vulcanization, there are still many carbon-carbon double bonds in the molecular chains of natural rubber.

A、正确

B、错误

Video 12: Synthetic rubber

1、【单选题】An elastomer with great resistance to gas permeation can serve as inner tubes, gas hoses, tubing.

A、SBR

B、IIR

C、Neoprene

D、NR

2、【单选题】The sidewall rubber of tire is .

A、SBR

B、IIR

C、Neoprene

D、NR

3、【多选题】Neoprene rubber is widely used to prepare diver's suit and soles, based on its special properties of .

A、excellent impermeability

B、excellent resistance to weathering

C、good chemical stability

D、good stability in high temperature

4、【判断题】SBR has a lower hysteresis than polyisoprene.

A、正确

B、错误

5、【判断题】Silicon rubber also has many reactive points in the molecular chains, which is same as polyisoprene and polybutadiene.

A、正确

B、错误

Video 13: Thermoplastic Elastomers

1、【单选题】Which of the following property would thermoplastic elastomer have over natural rubber and synthetic rubber?

A、High elasticity

B、Good resilience

C、Recyclability

D、Oil resistance

2、【多选题】 is an elastomer has physical cross-links in the “network” structure.

A、NR

B、SBS

C、SIS

D、NBR

3、【多选题】 can be employed as the physical crosslinking structure in thermoplastic elastomer.

A、Crystallization

B、Hard block

C、Soft block

D、Polymerization

4、【判断题】There is a chemical cross-linking in the rubber network of thermoplastic rubbers.

A、正确

B、错误

Module 6 Question 6

Module 6 Quiz

1、【单选题】For the molecular weight distribution, which one of the followings is not correct?

A、There is a considerable variation in molecular weight of polymers

B、The molecular weight distribution can be expressed by the ratio Mw/Mn.

C、 A polymer sample can be considered as a mixture of chains having different lengths

D、 The molecular weights of polymers are usually uniform

2、【单选题】The fundamental reactions involved in addition polymerization are ______.

A、 Addition to double bond and generation of a primary radical

B、Decomposition of initiator and transfer to initiator radicals

C、 Initiation, propagation, transfer and termination

D、 Initiation, propagation and termination

3、【单选题】When an improved tensile loading is applied, crystallinity of natural rubber would .

A、Increase

B、Decrease

C、Constant

D、Uncertain

4、【单选题】Which plastic product is processed by injection molding?

A、

B、

C、

D、

5、【单选题】An elastomer with great resistance to gas permeation can serve as inner tubes, gas hoses, tubing.

A、SBR

B、IIR

C、Neoprene

D、NR

6、【单选题】The sidewall rubber of tire is .

A、SBR

B、NR

C、 IIR

D、Neoprene

7、【单选题】Which of the following property would thermoplastic elastomer have over natural rubber and synthetic rubber?

A、High elasticity

B、Good resilience

C、Recyclability

D、 Oil resistance

8、【单选题】Using terephthalic acid and ethylene glycol, and by the reaction of carboxyl and hydroxyl groups, _________ is synthesized.

A、 PVC

B、PET

C、 PU

D、Nylon

9、【多选题】Monomers used for producing polymers should be ___________.

A、Unsaturated monomers

B、Monomers containing carbon-carbon double or triple bonds

C、Saturated monomers

D、 Saturated monomers having more than 2 reactive groups

10、【多选题】Polymers with high molecular weights have _________.

A、High viscosity

B、Strong intermolecular interactions

C、High impact strength

D、High moisture absorption

11、【多选题】Usually，polymerization includes _______, based on the mechanism involved in forming polymers.

A、Chain growth polymerization

B、Condensation polymerization

C、Addition polymerization

D、Step growth polymerization

12、【多选题】Usually, polymers have the structures of _________, and various isomeric configurations

A、Network

B、 Linear

C、 Branched

D、Crosslinked

13、【多选题】The repeating units on the copolymer chain may be arranged in various sequences along the backbone chain, including:

A、Random copolymer

B、 Block copolymer

C、Graft copolymer

D、Alternative copolymer

14、【多选题】Most polymers are flammable in their pure form, except _________.

A、Polystyrene

B、Poly(vinyl chloride)

C、Polytetrafluoroethylene

D、 Polyimide

15、【多选题】Natural rubber is a kind of .

A、 Thermoplastic polymers

B、Thermosetting polymers

C、Unsaturated polymers

D、Saturated polymers

16、【多选题】 is an elastomer having physical cross-links in “network” structure.

A、NR

B、SBS

C、SIS

D、NBR

17、【多选题】In comparison with PE, ________ is or are correct.

A、Nylon has a higher degree of crystallinity, and a higher melting point.

B、 Nylon has a higher degree of crystallinity, and a lower melting point.

C、 PVC and PAN have higher degrees of crystallinity, and higher melting points.

D、 PVC and PAN have lower degrees of crystallinity, and lower melting points.

18、【判断题】A polymer is a macro-molecule formed by linking many small molecules together.

A、正确

B、错误

19、【判断题】Degree of crystallinity indicates the fraction of crystalline structure or imperfections existing in polymers.

A、正确

B、错误

20、【判断题】Semicrystalline polymers usually are transparent.

A、正确

B、错误

21、【判断题】Rapid cooling of polymers could lead to order arrangement of chains for crystallization.

A、正确

B、错误

22、【判断题】Viscoelasticity is a property unique to polymers such as plastics, elastomers and adhesives.

A、正确

B、错误

23、【判断题】Increasing the molecular weight tends to raise the glass transition temperature.

A、正确

B、错误

24、【判断题】Thermosets generally have better toughness or impact strength than thermoplastics.

A、正确

B、错误

25、【判断题】Glass transition related closely to molecular motions.

A、正确

B、错误

26、【判断题】The formation of cross-linked structures in synthetic rubbers is usually called vulcanization. After vulcanization, there are still many carbon-carbon double- bonds in the molecular chains of natural rubber.

A、正确

B、错误