Multiple Choice Q+A for Business
Group 1
1.
Which of the following is a ceramic material?
a.
b.
c.
d.
Silver
Diamond
Ice
Rubber
2.
a.
b.
c.
d.
Which ceramic material has the highest ionic character?
SiC
SiO2
Al2O3
CaF2
3.
These materials are commonly used in furnace linings, glass manufacturing,
metallurgical heat treatment, and bricks.
a. Cement
b.
Refractories
c. Abrasives
d. Clay
4.
a.
b.
c.
d.
These materials are used to wear, grind or cut other materials.
Cement
Refractories
Abrasives
Clay
5. This is considered the most desirable mechanical characteristic of ceramics.
a. Hardness
b. Elasticity
c. Porosity
d. Creep
6.
At 60 mol% Al2O3, only a solid solution of spinel exists at what temperature?
a. 1400 °C
b. 2000 °C
c. 2600 °C
d. None of the above
7.
At 85 mol% Al2O3, only a solid solution of spinel exists at what temperature?
a. 1400 °C
b. 2000 °C
c. 2600 °C
d. None of the above
8. Which of the following is not true about vacancies in ceramic materials?
a.
Ion vacancies occur in pairs which are explained by the Frenkel Defect.
b. Paired ion vacancies are shown in Schottky Defect.
c. Vacancies form in non-stoichiometric compounds.
d. Vacancies are created by substitutional impurity ions having differing charge states than the
host ions
9.
a.
b.
c.
d.
These are crack surfaces that are formed during initial propagation.
Crack source
Mirror
Mist
Hackel
10.
a.
b.
c.
d.
Which ceramic crystal is of the ABX3 type?
Thorium Dioxide [ThO2]
Magnesium Aluminate [MgAl2O4]
Kaolinite [Al₂(Si₂O₅)(OH)₄]
Strontium Stannate [SrSnO3]
Group 2 [Polymers]
1. Which of the following techniques are adapted to producing continuous lengths
having constant cross-sectional geometries like rods, tubes, hose channels, sheets, and
filaments?
A. Injection Molding
B. Extrusion
C. Calendaring
D. Blow Molding
2. The following are factors that influence the mechanical properties of semicrystalline
polymers except for:
A. Predeformation by drawing
B. Degree of crystallinity
C. Molecular geometry
D. Heat-treating
3. It is the temperature at which the polymer experiences the transition from rubbery, soft
and flexible into rigid, hard, amorphous and brittle states.
A. Glass Transition Temperature
B. Freezing Point
C. Nucleation Temperature
D. Curing Temperature
4. Which of the following is NOT a natural polymer?
A. Silk
B. Rubber
C. Nylon
D. Wool
5. Which of the following is NOT a copolymer?
A. Acrylonitrile Butadiene Styrene (ABS)
B. Nitrile Rubber
C. Polyethylene-Vinyl Acetate (PEVA)
D. Polylactic Acid (PLA)
6. The resulting single-chain macromolecule when more than one homopolymer unit is
linked together via covalent bonds.
A. Block Copolymer
B. Statistical Copolymer
C. Comb Copolymer
D. Graft Copolymer
7. A phenomenon that frequently precedes fracture in some thermoplastic polymers.
A. Cracking
B. Deforming
C. Breaking
D. Crazing
8. Polyjet Printing is usually applied in:
A. Anatomical models
B. Custom-fitting biomedical implants
C. Dental and orthodontic models
D. Automobiles
9. It is a type of polymer additive that improves flexibility, ductility, and toughness. It is
commonly applied in thin-sheets, tubing, raincoats, and curtains.
A. Plasticizers
B. Fillers
C. Stabilizers
D. Flame Retardants
10. Which of the following is a distinctive feature of melting a polymer that is not
observed in metals and ceramics?
A. Impurities in a polymer increases the melting point
B. Polymers melt over a range of temperatures
C. The chains in a polymer are more mobile and packed together at lower temperatures
D. Melting behavior is not influenced by the history of the specimen
Group 3
1. How much longer should a fiber length be in terms of its critical fiber length for it
to be considered as a continuous fiber?
A. > 14lc
B. > 15lc
C. > 16lc
D. > 17lc
2. What role does the matrix phase play in the mechanical characteristics of
fiber-reinforced composites, and how does the interfacial bond between the fiber
and matrix affect load transfer and composite failure?
A. The matrix phase has no influence on the mechanical characteristics of
fiber-reinforced composites.
B. The matrix phase only affects the color of fiber-reinforced composites.
C. The matrix phase is critical in transmitting stresses and strains to the
reinforcing fibers, and a strong interfacial bond is desirable for effective
load transfer and improved mechanical properties.
D. The interfacial bond between the fiber and matrix materials has no impact on
load transfer or composite failure.
3. What are the reinforcement types of polymer-matrix composites?
A. Glass
B. Carbon
C. Aramid
D. All of the above
4. What is the difference between Laminar Composite and Sandwich Panels
A. Laminar composites have a thicker core material than sandwich panels.
B. Laminar composites are made up of two outer sheets (or skins) that are bonded
to a thicker core material, while sandwich panels are composed of
two-dimensional sheets or panels bonded to one another.
C. Sandwich Panels are made up of two outer sheets (or skins) that are
bonded to a thicker core material, while laminar composites are composed
of two-dimensional sheets or panels bonded to one another.
D. There is no difference between laminar composites and sandwich panels, as
both of them are structural composites.
5. Which type of composite material consists of a polymer resin as the matrix and
fibers as the reinforcement medium?
A. Ceramic-matrix composites
B. Carbon-carbon composites
C. Hybrid composites
D. Polymer-matrix composites
6. What is the primary goal of fiber-reinforced composites?
A. To achieve high strength and stiffness on a weight basis
B. To achieve high flexibility and elasticity on a weight basis
C. To achieve high durability and resistance to wear and tear
D. To achieve high thermal conductivity and electrical resistivity
7. Which of the following industries is expected to drive the demand for composites
in the Philippines?
A. Agriculture
B. Healthcare
C. Construction
D. Retail
8. Which of the following is NOT a geometrical or spatial characteristic of various
dispersed phase geometry that may influence the properties of the composite?
A. Location
B. Size
C. Concentration
D. Distribution
9. The stage at which composite failure begins as depicted in a stress-strain diagram
of continuous and aligned fiber composites with longitudinal loading.
A. Stage I
B. Stage II
C. Stage III
D. Failure Stage
10. A technique used to slow down crack propagation in ceramic composites by
transforming tetragonal zirconia particles to their stable monoclinic phase to
compress formed cracks and arrest crack propagation.
A. Whisker Reinforcement
B. Isostatic pressing
C. Transformation Toughening
D. Structure Stabilization
Group 4
1.
These techniques were established for the uncertainty of fracture characteristics
to different materials.
a.
Tensile Testing
b.
Impact Testing
c.
Shear Testing
d.
Hardness Testing
For Questions 2-3
A fatigue test was conducted in which the mean stress was 60 MPa, and the stress
amplitude was 250 MPa.
2.
a.
b.
c.
d.
What the maximum stress level
280 MPa
-220 Mpa
-280 Mpa
220 Mpa
3.
a.
b.
c.
d.
What is the minimum stress level
280 MPa
-220 Mpa
-280 Mpa
220 Mpa
4.
a.
b.
c.
d.
What is the crack propagation that is along the grain boundaries?
Transgranular
Cleavage
Intergranular
Transcrystalline
5.
What is the a property that is a measure of a material’s resistance to brittle
fracture when a crack is present? [drac toughness]
a.
Stress raisers
b.
Plane strain
c.
Stress Concentration
d.
Fracture toughness
6.
Which fracture is characterized by extensive plastic deformation in the vicinity of
an advancing crack?
a.
Ductile fracture
b.
Brittle fracture
c.
Unstable fracture
d.
Bristle fracture
7.
What is a common type of catastrophic failure in which the applied stress level
fluctuates with time?
a.
Fatigue
b.
Fracture
c.
Stress
d.
Strain
8.
What type of test that are plotted as stress (normally, stress amplitude) versus the
logarithm of the number of cycles to failure.
a.
S-N curve (ans)
b.
N-S curve
c.
Stress-Strain curve
d.
Stress-Failure curve
9.
Both temperature and applied stress level influence creep behavior. Increasing
either of these parameters produces the following effects: which is not an effect of the
increased parameters?
a.
An increase in instantaneous initial deformation.
b.
An increase in the steady state creep rate
c.
A decrease in the rupture life
d.
A decrease in stress and strain.
10.
a.
b.
c.
d.
Which is not considered to extend fatigue life?
Reducing the mean stress level
Eliminating sharp surface discontinuities
Improving the surface finish by polishing
Expose to heat
Group 5
1. This type of corrosion occurs as a consequence of fluid motion, typically as a
combined action of a chemical attack and mechanical abrasion.
Uniform Attack
Galvanic Corrosion
Erosion-Corrosion (Correct Answer)
Stress Corrosion
2. The following are all measures to corrosion prevention, except for:
The coating maintains a high degree of surface tension (Correct Answer)
Judicious selection of materials
Lowering of fluid temperature and/or velocity
The coating must be resistant to mechanical damage
3. What direction does pitting ordinarily penetrate?
Right to left
Left to right
Top to bottom (Correct Answer)
Bottom to top
4. refers to a heat treatment in which a material is exposed to an elevated temperature for
an extended time period and then slowly cooled.
Stress relief
Annealing (Correct Answer)
Normalizing
Quenching
5. The following are annealing processes except:
Heating to the desired temperature
Holding or “soaking” at that temperature
Cooling
Increase softness, ductility, and toughness (Correct Answer)
6. Standard procedure widely used to determine hardenability is
The Jominy end-quench test (Correct Answer)
Process annealing
Spherodizing
precipitation
7. Which of the following is an example of cold work?
Soldering
Welding
Bending (Correct Answer)
Brazing
8. The destructive and unintentional attack of a metal.
Oxidation
Reduction
Corrosion (Correct Answer)
Degradation
9. The standard emf series is only applicable under what conditions?
Alloying metals
Pure metals (Correct Answer)
Metalloids
Nonmetals
10. This refers to the thickness loss of material per unit time
Corrosion penetration rate (Correct Answer)
Corrosion physical rate
Corrosion peak rate
Corrosion pack rate
Group 6
1.
These are electrically insulating (nonmetallic) materials that exhibit an electric
dipole structure and are used in capacitors.
a.
b.
c.
d.
Dielectric Materials
Semiconductors
Insulators
Dopants
2.
It is possible for one or more of the contributions of electronic, ionic, and
orientation to the total polarization to be either absent or negligible in magnitude
relative to the others.
a.
b.
c.
True
False
Inconclusive
3.
Synthesized polymeric materials that have electrical conductivities on par with
those of metallic conductors.
a.
b.
c.
d.
Polymers
Inducting Polymers
Semiconducting Polymers
Conducting Polymers
4.
Which semiconductor device has a gate current that is significantly less than
the base current?
a.
b.
c.
d.
MOSFET
Flash Memory
Transistor
Junction Transition
5.
Which temperature range is known as the extrinsic-temperature
region?
a. 90K - 240K
b. 800K - 1230K
c. 475K - 650K
d. 150K - 475K
6.
The Lorentz force is what causes the Hall effect due to the exertion on charge
particles when a magnetic field is applied perpendicular to their direction of motion.
Which factor identifies the kind and charge carrier concentration, and mobility of the
particle?
a.
b.
c.
d.
Hall coefficient
Conductivity
Thickness of Specimen
Hall voltage
7.
The reciprocal of minimum reorientation time
a.
b.
c.
d.
Excitation frequency
Relaxation frequency
Unregulated Frequency
Regulated Frequency
8.
In the Ohm’s law, the I stands for:
a.
b.
c.
d.
9.
a.
b.
c.
d.
Resistance
Current
voltage
electrical resistivity
The following is true about insulators, EXCEPT:
The nature of an insulator is due to an addition of an impurity
It is a material that has low conductivity
Glass and ceramics are insulators
There is no flow of current through an insulator
10. It is the outermost band where electrons can jump out of
a.
b.
c.
d.
Band gap
Conduction band
Electric band
Valence band
Group 7
1. A type of semiconductor that is pure, without impurities, and has very low conductivity
at room temperature.
A. Extrinsic Semiconductor
B. Intrinsic Semiconductor
C. P-type Semiconductor
D. N-type Semiconductor
2. A Type of Extrinsic Semiconductor that is created by adding a dopant with more
valence electrons than the semiconductor material
A. P-Type
B. F-Type
C. N-Type
D. R-Type
3. A three-terminal semiconductor device that amplifies or switches electronic signals
and power
A. Resistor
B. Diode
C. Capacitor
D. Transistor
4. Also known as magnetic induction, this is the material’s internal field strength when
there is an H field applied
A. Relative Magnetic Permeability
B. Magnetic Flux Density
C. Magnetic Field Strength
D. Magnetic Susceptibility
5. The extent or degree to which a material can be magnetized in the presence of an
external field
A. Relative Magnetic Permeability
B. Magnetic Flux Density
C. Magnetic Field Strength
D. Magnetic Susceptibility
6. A very weak, non-permanent form of magnetism that only exists with the application of
an external field
A. Ferrimagnetism
B. Ferromagnetism
C. Diamagnetism
D. Paramagnetism
7. The temperature limit wherein an antiferromagnetic material has maximum
susceptibility and becomes a paramagnetic material
A. Curie Temperature
B. Boyle Temperature
C. Neel Temperature
D. Inversion Temperature
8. Small-volume regions where all net dipole moments are mutually aligned and at
saturated magnetization
A. Domains
B. Hysteresis
C. Remanence
D. Anisotropy
9. All of the following correctly describes a Soft Magnetic Material except for one; which
one is it?
A. With small, thin, and narrow hysteresis loops
B. May be easily magnetized and demagnetized
C. Applied in Generators, Motors, and Dynamos
D. Has low permeability and high coercivity
10. Determine which one among the following about Superconductivity is false.
A. Electrical phenomenon where electrical resistivity suddenly reaches a virtually zero value and
remains as temperature further decreases
B. At temperatures below critical, superconductivity remains even if a sufficient magnetic
field or current density is applied.
C. There are two types of Superconductors: Type I and Type II
D. Type II superconductors gradually transition from the superconducting state to the normal
state between lower and higher critical fields.
Group 8
1. It is the smallest discrete amount of electromagnetic radiation.
a. wave
b. particle
c. ray
d. photon
2. It is the result of selective absorption of specific wavelengths of visible light.
a. color
b. transmission
c. refraction
d. opacity
3. What properties could possibly make an insulator like aluminum oxide
opaque?
a. polycrystalline and nonporous
b. polycrystalline and porous
c. single-crystal
d. none of the choices
4. Solar cells function because of what optical phenomenon?
a. fluorescence
b. radiation
c. photoconductivity
d. phosphorescence
5. The optical phenomenon of luminescence can be categorized based on ______.
a. delay time between transitions
b. conductivity
c. translucence
d. all of the choices
6. It is the process of a photon of light being absorbed by nonmetallic materials
by electronic polarization and valence-conduction band electron transitions.
a. Reflection
b. Refraction
c. Absorption
d. Color
7. Signal transmission through a metallic wire conductor is ______, whereas
using optically transparent fibers, signal transmission is _______.
a. electronic; photonic
b. neutronic; electronic
c. photonic; electronic
D. neutronic; photonic
8. It is an optical fiber design wherein the index of refraction of the cladding is
slightly lower than that of the core. The output pulse is broader than the input
pulse.
a. Grade-index design
b. Step-index design
c. Crystalline-index design
d. Color-index design
9. Photons is the smallest discrete amount or quantum of electromagnetic
radiation and are always in motion. At what constant speed do photons travel?
a. 3 x 10^7 m/s
b.3 x 10 ^ 9 m/s
c. 3x 10 ^10 m/s
d. 3 x 10^8 m/s
10. It is a kind of material where light is scattered to an extent that objects are not
clearly distinguishable.
a. Opaque
b. Transluscent
c. Transparent
d. Reflector
Group 9
1. These materials are defined as materials that can remember configurations and
conform to them once they sense the specific external stimulus.
a. Advanced materials
b.
Smart materials
c. Nanoengineered materials
d. Biomaterials
2. Which of the following materials is commonly considered as a passive smart
material?
a. Shape memory alloys
b. Piezoelectric ceramics
c. Magnetorheological fluids
d.
Optical fibers
3. The ability of a smart material to change its intrinsic properties in response to an
external stimulus, and as such, intelligence is internal rather than external to the
material.
a. Transiency
b.
Self-actuation
c. Selectivity
d. Directness
4.
It is the property of an alloy which allows it to return to its original
shape after deformation isothermally.
a. Thermoelasticity
b.
Superelasticity
c. Shape memory effect
d. Superplasticity
5.
The rheological properties of magnetorheological fluids are often
estimated by considering them as
.
A.
Bingham plastics
b. Pseudoplastics
c. Thixotropic fluids
d. Rheopectic fluids
6. The shape memory effect involves the recovery of the
deformation through heating.
phase after
a. Martensite
b. Austenite
c. Cementite
d. Pearlite
7.
The following statements are correct EXCEPT:
a. Magnetostriction is caused by spin-orbit coupling.
b. Martensite phase alloys can be deformed and recovered at constant temperature.
c. Crystals that have no centers of symmetry tend to be piezoelectric.
d. Magnetostriction is stronger in rare-earth metals.
8.
What is the first step in manufacturing magnetostrictive materials?
a. Addition of terfenol-D powder
b. Polarization
c. Placement in cylindrical containers
d.
Addition of hardener into the epoxy resin
9. Which of the following is not a main constituent in preparing magnetorheological
fluid?
a. Magnetizable particles
b.
Hydrocholloid gum
c. Base Fluid
d. Stabilizer Additives
10. In choosing the powder for electrorheological fluid, the desired powder must have
particle powder size in comparison with the ER fluid dispensing particle.
a.
b.
c.
d.
Equal
Greater
Smaller
None of the above
Group 10
1. Other than the criteria that relates to different material properties, what is the another
important criteria to take into consideration in material science & engineering?
a.) Mechanical concerns
b.) Corrosion concerns
c.) Environmental and societal concerns
2. What are some of the environmental and societal concerns that engineers need to
consider when choosing materials for their projects?
a.) Natural resources
b.) pollution and waste
c.) Population
3. A “total materials cycle” is:
a.) the process of creating new materials from recycled materials
b.) the journey of raw materials from natural resources to finished products and back to
the environment
c.) the process of disposing waste materials in an environmentally friendly way
4. This is an approach to assessing the environmental impact of a product from the
production to disposal.
a.) Total materials cycle
b.) ISO 14001
c.) Life cycle assessment
5. This Senate Bill proposes to require electronic gadgets manufacturers to have a
recovery plan concerning the recycling of e-waste where the consumers will not pay any
fee.
a) Senate Bill No. 751
b) Senate Bill No. 246
c) Senate Bill No. 785
6. It is a type of recycling process that separates fiber and matrix, and its primary goal is
fiber recovery.
a) Mechanical Process
b) Chemical Process
c) Sorting and Separation Process
7. Which of the following materials discussed in environmental concerns topic is known
to be a multiphase?
a) Rubber
b) E-Waste
c) Composite Material
8.) What polymer comprises materials of Recycling Code Number 5?
a) Polyvinyl chloride
b) Polypropylene
c) Polystyrene
9.) Cullets are small pieces of ____.
a) Metals
b) Glass
c) Composites
10.) Trait of a material which refers to its ability to degrade into its initial raw state with
natural interactions over time.
a) recyclability
b) biodegradability
c) reusability