Materials and Their Properties Quiz

Materials and Their Properties: ten questions on density and mechanical response. Includes calculations; answers explained.

Free, with no sign-up.

For High school students and adults reviewing the topic.

About 11 minutes. 10 questions.

How does it work?

Choose one answer or enter a number in the stated unit, then check it.
Read the explanation before continuing.
Round only the final answer to the precision requested.

What will you get?

See your score and review the reasoning behind each answer.

Question 1A sample has mass 4.2 kg and volume 0.0012 m³. Find density in kg/m³, rounded to two decimals.

Enter a number in kg/m³.

Answers within 0.005 kg/m³ of the expected value are accepted.

Question 2A uniform tensile force of 7200 N acts on an original cross-sectional area of 0.00024 m². Find engineering stress in Pa, rounded to the nearest whole number.

Enter a number in Pa.

Answers within 0.5 Pa of the expected value are accepted.

Question 3A sample originally 0.8 m long extends by 0.008 m. Find engineering strain as a number with no unit, rounded to four decimal places.

Enter a number.

Answers within 0.00005 of the expected value are accepted.

Question 4A stiff strip returns to its original shape after a small load is removed. What does this response establish?

Plastic deformation within the tested loading rangeElastic recovery of the specimen’s original dimensionsLow stiffness because the strip eventually recoveredHigh toughness because the strip avoided a visible crack

Question 5A wire remains permanently longer after unloading. Which response has occurred?

Plastic deformation beyond reversible extensionElastic deformation that changes the wire’s resting lengthBrittle fracture with negligible extension before separationIncreased stiffness established by the remaining extension

Question 6Two samples break under tension. One stretches permanently before breaking; the other shows little plastic change. How do their failures differ?

The first is brittle and the second is ductileThe first is elastic and the second is conductiveThe first is hard and the second is denseThe first is ductile and the second is brittle

Question 7A designer needs a surface that resists indentation under a small contact load. Which property directly addresses that requirement?

Toughness assessed for the proposed surface materialDensity recorded for the material used in the surfaceHardness assessed with a suitable standardized testThermal conductivity under the intended test conditions

Question 8A protective casing must absorb impact energy before fracturing. Which property is central to that requirement?

Strength recorded during a tensile testThe material’s density in its finished stateToughness under the intended service conditionsElectrical conductivity of the casing material

Question 9A hot tool needs a handle that slows heat transfer to a hand. Which selection criterion fits this function?

Low thermal conductivity at the operating temperatureA handle that conducts heat rapidly to match the tool’s temperatureCharge transport as a replacement for thermal insulationInsulation that increases in direct proportion to material density

Question 10Suppose a tensile part contains a sharp notch. Why might its average stress underestimate the danger?

The notch makes the load spread perfectly evenlyLocal stress concentrates near the geometric discontinuityAverage stress equals the highest stress by definitionThe material’s density measures the notch’s peak stress

Answer every question to see and share your score.

Read the topic guide