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Quiz 7b

Total questions: 60

Worksheet time: 30mins

Name
Class
Date
1.

According to the figure showing (a) tensile, (b) compressive, (c) flexural (bending), (d) torsion, and (e) shear forces, which force corresponds to bending of a beam-like specimen?

a)

Flexural force

b)

Tensile force

c)

Compressive force

d)

Shear force

2.

When a force is applied on a solid material, what is the material’s response as stated in the fundamentals of deformation?

a)

It deforms in response to the force

b)

It remains unchanged regardless of force

c)

It instantly melts

d)

It becomes more crystalline

3.

The diagram shows a cylindrical bar with arrows pushing inward from both ends. What type of force is being applied?

a)

Compressive force

b)

Tensile force

c)

Torsion force

d)

Shear force

4.

Extension by stretching is described as the simplest type of deformation in the tensile fundamentals. What does extension involve?

a)

Deformation by stretching

b)

Deformation by twisting

c)

Deformation by compressing

d)

Deformation by shearing

5.

A mechanical test that uses tensile forces is called what?

a)

Tensile test

b)

Hardness test

c)

Compressive test

d)

Shear test

6.

In tensile testing, what is meant by tensile strength?

a)

The stress needed to break a sample

b)

The elongation at yield

c)

The force required to bend a sample

d)

The modulus of elasticity

7.

Which units are appropriate for expressing tensile strength, as noted in the tensile fundamentals?

a)

Pascal-based units such as MPa, GPa, or N/mm^2

b)

Kelvin

c)

Decibel

d)

Joule

8.

In measuring elongation during a tensile test, the portion of the narrowed section of the sample over which it is measured is termed what?

a)

Gauge length

b)

Cross-sectional area

c)

Yield region

d)

Grip length

9.

Which instrument is used to determine elongation and tensile modulus in a tensile test?

a)

Extensometer

b)

Micrometer

c)

Dynamometer

d)

Caliper

10.

Refer to the diagram of a tensile specimen before and after testing with gage markings. In the stressed sample, what is the distance between the gage markings indicated in the figure?

a)

2in2\,\text{in}

b)

2.65in2.65\,\text{in}

c)

8in8\,\text{in}

d)

1in1\,\text{in}

11.

In the same tensile specimen diagram, what gage length is indicated for the unstressed sample before testing?

a)

1in1\,\text{in}

b)

2in2\,\text{in}

c)

2.65in2.65\,\text{in}

d)

8in8\,\text{in}

12.

Based on the arrows labeled F acting on the specimen ends, which type of loading is applied in the diagram of the tensile specimen before and after testing?

a)

Compressive

b)

Torsional

c)

Shear

d)

Tensile

13.

According to the ASTM D 638 composite sample drawing, what overall specimen length is shown?

a)

25mm25\,\text{mm}

b)

250mm250\,\text{mm}

c)

2.5mm2.5\,\text{mm}

d)

100mm100\,\text{mm}

14.

In the ASTM D 638 composite sample drawing, what thickness is specified at the edge detail?

a)

0.8mm0.8\,\text{mm}

b)

2.5mm2.5\,\text{mm}

c)

25mm25\,\text{mm}

d)

5mm5\,\text{mm}

15.

In image a of the composite samples slide, what test setup is shown holding a strip specimen?

a)

Three-point bending fixture

b)

Vickers hardness indenter

c)

Tensile grips in a universal testing machine

d)

Charpy impact pendulum

16.

In the dumbbell specimen diagram labeled Before loading and After fracture, which region is identified as undergoing the localized reduction in cross-section during tensile testing?

a)

Grip section

b)

End tabs

c)

Necked-down region

d)

Gauge shoulder fillet

17.

Which structural factors listed determine the tensile behavior of polymers? Select all that apply.

a)

Average molecular weight

b)

Degree of crystallization

c)

Effect of highly polar atoms on the main chain

d)

Presence of phenyl rings in the main chains

e)

Processing temperature during moulding

18.

According to the final slide, ADMET is associated with which field?

a)

Pharmaceutical dosing equipment

b)

Materials testing systems

c)

Microelectronics design services

d)

Environmental monitoring sensors

19.

Performing Test: According to the flexural test method described, what behavior does this method measure for materials subjected to simple beam loading?

a)

Resistance to surface abrasion

b)

Behavior under bending loads

c)

Thermal expansion rate

d)

Electrical conductivity under stress

20.

Performing Test: How is the simple rectangular beam specimen positioned and loaded in the flexural test described?

a)

Clamped at one end and pulled in tension at the free end

b)

Suspended by cables and impacted at one corner

c)

Placed over two supports and loaded at the middle between the supports

d)

Bonded to a plate and compressed uniformly across its surface

21.

Performing Test: In the illustrated three‑point bending apparatus, where is the load applied to the specimen relative to the supports?

a)

Directly above the left support

b)

At the midpoint between the two supports

c)

Directly above the right support

d)

At an off‑center point near one end

22.

Brand Reference: Which web address is shown for the materials testing systems brand displayed?

a)

www.ADMET.com

b)

www.ADMIT.com

c)

www.ADAMET.com

d)

www.AMDET.com

23.

Strengthening of Polymers: Which factor increases strength up to a certain critical mass?

a)

Average molecular mass

b)

Sample thickness

c)

Cooling rate after processing

d)

Ambient humidity

24.

Strengthening of Polymers: Which change increases strength, modulus of elasticity, and density?

a)

Decrease in crystallinity

b)

Increase in crystallinity

c)

Addition of plasticizer

d)

Reduction in chain entanglement

25.

Strengthening of Polymers: What modification can hinder chain slippage during permanent deformation?

a)

Shortening the main carbon chain

b)

Introducing pendant atomic groups to the main carbon chain

c)

Removing all polar atoms from the backbone

d)

Increasing porosity

26.

Strengthening of Polymers: Which approach increases strength by bonding on the main carbon chain?

a)

Bonding highly polar atoms

b)

Bonding nonpolar inert gases

c)

Removing functional groups

d)

Adding voids through foaming

27.

Deformation Mechanism (Semicrystalline polymers, T greater than Tg): Which stage is described as NECK forms and grows unstably, i.e., inhomogeneous plastic deformation?

a)

I

b)

III

c)

V

d)

VIII

28.

Deformation Mechanism (Semicrystalline polymers, T greater than Tg): Which stage corresponds to COLD DRAWING, where the neck increases in length by extracting polymer from the unnecked region?

a)

II

b)

IV

c)

V

d)

VII

29.

Deformation Mechanism (Semicrystalline polymers, T greater than Tg): At which stage does fracture occur?

a)

I

b)

VI

c)

VII

d)

VIII

30.

Stages and Mechanisms of Plastic Deformation: Which listed stage describes rotation/tilting of lamellae crystallites toward the tensile axis?

a)

Elongation of amorphous chains

b)

Rotation/tilting of lamellae crystallites toward tensile axis

c)

Separation of crystallites into block segments

d)

2nd strain hardening regime

31.

Stages and Mechanisms of Plastic Deformation: Which stage involves separation of crystallites into block segments due to partial melting?

a)

Stage 1

b)

Stage 3

c)

Stage 4

d)

Stage 5

32.

Stages and Mechanisms of Plastic Deformation: In the 2nd strain hardening regime, what microstructural change is described?

a)

Randomization of chain orientation leading to softness

b)

Recrystallization to a fiber‑like oriented structure with high stiffness

c)

Void formation and stress whitening without orientation

d)

Complete melting of all crystalline lamellae

33.

In the semi-crystalline polymer deformation diagram, the sequence of microstructural changes under increasing strain is shown below the stress–strain plot. Which change occurs immediately before the stage labelled crystalline regions slide?

a)

Amorphous regions elongate

b)

Crystalline regions align

c)

Onset of necking

d)

Near failure microvoiding

34.

According to the deformation mechanism figure, the aligned, networked cross-linked case follows a high-stress path that ends in brittle failure. Which failure mode is associated with this case?

a)

Plastic failure

b)

Brittle failure

c)

Creep rupture

d)

Fatigue failure

35.

The semi-crystalline case plot shows an unload/reload path during deformation. What does the presence of this path indicate about the material response in that region?

a)

Purely elastic behavior without hysteresis

b)

Viscoelastic or plastic behavior with hysteresis

c)

Immediate brittle fracture upon unloading

d)

Creep at zero stress

36.

In the elastomer deformation diagram, the green curve labelled elastomer rises gently with strain, and annotations state deformation is reversible. Which description best matches the initial microstructure of the chains?

a)

Straight and uncross-linked

b)

Kinked and heavily cross-linked

c)

Crystalline lamellae aligned

d)

Broken and entangled without cross-links

37.

For the elastomer curve, the annotation says deformation is reversible. What does the final chain configuration look like according to the diagram?

a)

Chains remain kinked and uncross-linked

b)

Chains are straight and still cross-linked

c)

Chains form crystalline lamellae that slide

d)

Chains fracture at the yield point

38.

In the schematic of elongation experiment for an amorphous polymer at room temperature, the stress–strain curve is marked A, B, C, D alongside sample silhouettes. Which stage corresponds to the formation of a localized neck?

a)

A

b)

B

c)

C

d)

D

39.

In the amorphous polymer elongation schematic, how does stress behave between A and B on the stress–strain curve?

a)

Increases approximately linearly with strain

b)

Remains nearly constant over strain

c)

Decreases linearly with strain

d)

Oscillates around a mean value

40.

In the polymer stress–strain diagram, which labelled point marks the onset of yield?

a)

A

b)

B

c)

C

d)

D

e)

E

41.

Between A and C on the stress–strain diagram, the material follows a straight-line relation. Which law describes this region?

a)

Hooke’s Law (linear elasticity)

b)

Newton’s Law of viscosity

c)

Griffith’s fracture criterion

d)

Fick’s First Law of diffusion

42.

At C on the stress–strain curve, the caption notes the actual curve deviates from the straight line. What is this limit called?

a)

Elastic limit

b)

Proportional limit

c)

Ultimate strength

d)

Fracture toughness

43.

On the stress–strain diagram, which labelled point corresponds to break?

a)

B

b)

C

c)

D

d)

E

44.

The stress–strain behaviour slide describes the A–B interval. Which statement best characterizes deformation in A–B?

a)

Permanent displacement of molecules dominates

b)

Relatively small, instantaneous, recoverable deformation

c)

Straightening of coiled chains without intermolcular slippage

d)

Molecular slippage with irreversible displacement

45.

Beyond C on the stress–strain behaviour slide, which process is highlighted?

a)

Intermolecular slippage causing permanent deformation

b)

Straightening of coiled portions of molecular chains without intermolecular slippage

c)

Formation of crystalline lamellae and immediate fracture

d)

Elastic unloading with no microstructural change

46.

Which region is identified as not recoverable, involving actual displacement of molecules with respect to each other?

a)

A–B

b)

Beyond C

c)

Beyond D

d)

A–C only

47.

Using the diagram titled "General types of tensile stress-strain behavior in polymers," identify which labeled curve corresponds to Low Modulus, Weak Materials with Low Toughness. Select the correct curve label.

a)

a

b)

b

c)

c

d)

d

48.

Using the diagram titled "General types of tensile stress-strain behavior in polymers," identify which labeled curve corresponds to High Modulus, Strong Materials with Low Toughness. Select the correct curve label.

a)

a

b)

b

c)

c

d)

d

49.

Using the diagram titled "General types of tensile stress-strain behavior in polymers," identify which labeled curve corresponds to High Modulus, Strong and Tough Materials. Select the correct curve label.

a)

a

b)

b

c)

c

d)

d

50.

Using the diagram titled "General types of tensile stress-strain behavior in polymers," identify which labeled curve corresponds to Low Modulus, Strong and Tough Materials. Select the correct curve label.

a)

a

b)

b

c)

c

d)

d

51.

Refer to the diagram of typical load–elongation behaviour of LDPE. What event occurs immediately after the maximum load is reached on the curve?

a)

Neck forms and grows along the specimen

b)

Material fractures at the grip without necking

c)

The specimen returns to its original shape elastically

d)

Uniform strain hardening occurs without necking

52.

In the five steps of deformation mechanism in polyethylene, which step is described as COLD DRAWING where the neck increases in length?

a)

I

b)

II

c)

III

d)

IV

e)

V

53.

In the five steps of deformation mechanism in polyethylene, which step corresponds to Near failure/ strain hardening?

a)

I

b)

II

c)

III

d)

IV

e)

V

54.

In the five steps of deformation mechanism in polyethylene, which step denotes Failure/ Fracture?

a)

I

b)

II

c)

III

d)

IV

e)

V

55.

On the Rubber Modulus slide, what does M100 represent?

a)

Tensile stress at 100% elongation

b)

Young’s modulus at zero strain

c)

Tensile strength at break

d)

Secant modulus at 300% elongation

56.

On the stress–elongation curve for a rubber compound, what does the vertical dashed line labeled Elongation At Break (%) indicate?

a)

The strain at which the specimen ruptures

b)

The load at yield

c)

The modulus measured at 300% strain

d)

The percentage of elastic recovery after unloading

57.

From the list of important terms associated with stress–strain behaviour, which term denotes the maximum stress reached on the curve?

a)

Yield Point

b)

Proportional limit

c)

Modulus of Elasticity

d)

Ultimate Strength

58.

From the important terms listed, which term is the slope of the initial linear portion of the stress–strain curve?

a)

Modulus of Elasticity

b)

Secant Modulus

c)

Yield Point

d)

Elongation

59.

In the general types of tensile stress–strain behaviour in polymers figure, which region corresponds to non-recoverable deformation after yielding?

a)

Elastic Region

b)

Plastic Region

c)

Ultimate Elongation

d)

Point of Rupture

60.

In the same figure, what is indicated by Yield Elongation?

a)

The strain at which yielding occurs

b)

The maximum strain before rupture

c)

The elastic recovery after unloading

d)

The minimum stress measured at yield