Learning through Quiz | Stress Strain Curve

QUESTION 01 / 20 · The basicsHow is average engineering tensile stress calculated?

Force × original lengthForce ÷ original cross-sectional areaChange in length ÷ forceCurrent length ÷ original length

QUESTION 02 / 20 · The basicsWhat does engineering strain measure?

Force per unit areaThe sample’s massThe maximum force before breakingChange in length divided by the original gauge length

QUESTION 03 / 20 · The basicsWhich unit is commonly used for stress in an engineering tensile test?

MPa, equivalent to N/mm²KilogramsMillimetres onlyPercent only

QUESTION 04 / 20 · The basicsA 50 mm gauge length extends by 0.5 mm. What is its engineering strain?

0.1%10%1%50%

QUESTION 05 / 20 · The basicsA tensile force of 20 kN acts on an original area of 100 mm². What is the average engineering stress?

20 MPa200 MPa2,000 MPa0.2 MPa

QUESTION 06 / 20 · The basicsIf the original area doubles while tensile force stays the same, what happens to average engineering stress?

It halvesIt doublesIt becomes four times largerIt stays the same

QUESTION 07 / 20 · Elastic and plastic behaviorAn intact sample is loaded only within its elastic range and then unloaded. What should happen?

It must fractureIt stays permanently longerIts original area must doubleIt returns to its original dimensions

QUESTION 08 / 20 · Elastic and plastic behaviorWhat does yielding indicate in a ductile metal’s tensile response?

The sample has already separatedThe stress must be zeroPermanent deformation is beginningThe material has no stiffness

QUESTION 09 / 20 · Elastic and plastic behaviorWhat does the slope of the initial straight portion of a stress–strain curve represent?

Young’s modulus, a measure of elastic stiffnessFracture strainThe specimen’s total massIts melting point

QUESTION 10 / 20 · Elastic and plastic behaviorTwo materials experience the same stress within their linear elastic ranges. Which stretches less?

The one with lower Young’s modulusThey must stretch equallyThe one with greater Young’s modulusWhichever has the larger fracture strain

QUESTION 11 / 20 · Ductile and brittle materialsWhich response is the clearest sign of ductility in a tensile test?

A steep initial elastic slope aloneVery high densityA dark fracture surface aloneSubstantial permanent stretch before fracture

QUESTION 12 / 20 · Ductile and brittle materialsWhich description best matches brittle tensile behavior?

Very large plastic stretch is always presentFracture occurs with little plastic deformationThe material has zero elastic stiffnessThe material cannot carry any tensile stress

QUESTION 13 / 20 · Reading the curveWhat is ultimate tensile strength on an engineering stress–strain curve?

The first nonzero strainThe stress at zero loadThe maximum engineering stress reached in the testThe stress after the broken pieces are fully separated

QUESTION 14 / 20 · Reading the curveWhat is necking during a ductile tensile test?

Stretch concentrating in a locally narrowing regionThe sample cooling below room temperatureThe grips moving sidewaysThe sample returning fully to its starting shape

QUESTION 15 / 20 · Reading the curveWhy can engineering stress fall after the peak in a ductile tensile test?

The original area used in the calculation suddenly increasesThe material becomes safe againThe strain must have returned to zeroThe measured force falls during localized necking

QUESTION 16 / 20 · Reading the curveWhat area is used to calculate true axial stress locally in a tensile specimen?

The original area in every caseThe current cross-sectional area carrying the forceThe area of the testing-machine baseThe outer surface area of the whole specimen

QUESTION 17 / 20 · Energy and propertiesIn a uniaxial tensile test, what does the total area under the stress–strain curve up to fracture describe?

A measure of energy absorbed per original unit volumeYoung’s modulus aloneThe sample’s densityOnly the yield stress

QUESTION 18 / 20 · Energy and propertiesWhich part of the curve is associated with resilience?

Only the falling branch after neckingOnly the single fracture pointThe area within the elastic regionThe horizontal-axis label

QUESTION 19 / 20 · Applying the conceptsHow is a 0.2% offset proof stress found when a metal has no sharp yield point?

Use the fracture stress divided by twoFind the intersection with a line parallel to the initial elastic slope, offset by 0.2% strainUse the steepest point after neckingChoose the stress at exactly 0.2% total strain on the curve

QUESTION 20 / 20 · Applying the conceptsAn intact sample is ductile, but a real bracket broke suddenly. What is the best next step?

Conclude that the tensile test is uselessAssume every ductile part must visibly stretch firstUse only the intact sample’s ultimate strength as a final diagnosisInvestigate cracks, actual loading, geometry and service conditions

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