Mechanical Properties

Mechanical Properties SFS 2112

​

Multiple Choice

Which letter represents the plastic region?

• C

• D

• E

• F

• G

Multiple Choice

Which letter represents the failure point?

• C

• D

• E

• F

• G

Multiple Choice

Which letter represents the yield strength?

• A

• B

• C

• D

• E

Multiple Choice

Which letter represents Ultimate Tensile Strength?

• A

• B

• C

• D

• E

Multiple Choice

Which has a higher density, a gram of steel or a kilogram of steel?

• A gram

• A kilogram

• They are the same

Multiple Choice

A material’s ability to be flattened into a sheet (malleability) or drawn into a wire (ductility) is known as

• force

• stress

• workability

• brittleness

Multiple Choice

Which of the following is a characteristic property?

• color of flame

• density

• boiling point

• All are characteristic properties

Multiple Choice

Pulling on a rubber band is an example of what kind of force?

• tension

• torsion

• compression

• shear

Multiple Choice

The property when a material deforms/distorts from stress and retains its new shape:

• plasticity

• elasticity

• polymerization

• thermoset

Multiple Choice

The two main divisions of solid structures are amorphous and:

• elastic

• morphous

• crystalline

• hard

Multiple Choice

Aluminium is a light material.

• true
• false

Multiple Choice

It is cheaper than silver and is a very good electrical conductor.

• Rubber
• Silver
• Copper
• Plastic

Multiple Choice

It is the steel which does not rust.

• Fibre
• Stainless
• Plasticine
• Clay

Multiple Choice

A bouncy ball is thrown to the floor. It deforms, then returns to its original shape. it is...

• elasticity

• plasticity

• hardness

• tensile strangth

Multiple Choice

Name the following mechanical property

• Shear

• compressional

• torsional

• tensional

Multiple Choice

Toughness is the ability to absorb energy and:

• twist

• resist fracture or breaking

• bend

• dent

Multiple Choice

Name the following mechanical property

• shear

• torsional

• compressional

• tensional

Multiple Choice

Elasticity:

• Is the materials ability to be bent without fracture.

• Is the materials ability to be stretched without fracture when the load is removed.

• Is the materials ability to be deformed and return to its original shape when the load is removed.

• Is the materials ability to resist a load before deforming.

Multiple Choice

Conductivity is:

• The measure to which a material will allow stress to pass through its atoms.

• The measure to which a material will resist stress to pass through its atoms.

• The measure to which a material will allow heat to pass through its atoms.

• The measure to which a material will resist heat to pass through its atoms.

Multiple Choice

Torsional strength:

• Is the materials ability to resit a tensile load without fracture.

• Is the materials ability to resit twisting without fracture.

• Is the materials ability to resit compression without fracture.

• Is the materials ability to resit a shear load without fracture.

Multiple Choice

Tensile strength:

• Is the materials ability to resit a tensile load without fracture.

• Is the materials ability to resit a shear load without fracture.

• Is the materials ability to resit compression without fracture.

• The materials ability to resist a torsional load without fracture.

Multiple Choice

Toughness can be defined as:

• The ability for the material to be drawn into a wire without fracture.

• The ability of a material to be shaped without fracture.

• The ability to withstand scratching and indentation.

• The ability to withstand impact and shock loading without fracture.

Multiple Choice

Hardenability is:

• The depth to which a material can be successfully hardened upon quenching.

• The ability of a material to resist scratching and indentation.

• The resistance to shaping a material due to its elastic properties.

• Where the material cannot be welded to another material.

Multiple Choice

Malleability is where:

• The material can be joined without cracking.

• A material can be cut into shape.

• A material can be moulded or pressed into shape without fracture.

• The material can be drawn into a wire through a series of dies.

Multiple Choice

Hardness can be defined as:

• The ability for a metal to be drawn into a wire.

• The ability of a material to resist scratching and indentation.

• The ability to withstand impact.

• The ability to not be moulded into a shape.

Multiple Choice

At room temperature, most metals are

• liquid
• solid
• gas
• an alloy

Multiple Choice

What is the lustre of a material?

• The refractive index of the material.

• The ability of a material to form thin sheets.

• How the light interacts with the surface of the material.

• The absorption properties of a material.

Multiple Choice

What property is this?

• lustrous

• tough

• malleable

Multiple Choice

What material is this?

• porcelain

• sand

• rock

Multiple Choice

What property is this?

• ductile

• brittle

• insulation

Multiple Choice

What material is this?

• rock

• asphalt

• sand

Multiple Choice

What property is this?

• resistant

• brittle

• malleable

Multiple Choice

What material is this?

• concrete

• asphalt

• brick

Multiple Choice

What material is this?

• copper

• steel

• gold

Multiple Choice

What property is this?

• insulation

• resistant

• malleable

Multiple Choice

What material is this?

• rock

• wood

• glass

Multiple Choice

What property is this?

• resistant

• lustrous

• tough

Multiple Choice

What material is this?

• rock

• tiles

• lumber

Multiple Choice

What material is this?

• asphalt

• concrete

• sand

Multiple Choice

What material is this?

• gold

• iron

• copper

Multiple Choice

A material you can see through is called ...

• Transparent
• Opaque

Multiple Choice

An heat conductor...

• will not allow electricity to pass through it 
• will allow electricity to pass through it 
• will not allow heat to pass through it 
• will allow heat to pass through it 

Multiple Choice

An heat insulator...

• will not allow electricity to pass through it 
• will allow electricity to pass through it 
• will not allow heat to pass through it 
• will allow heat to pass through it 

Multiple Choice

Flexible means...

• bends easily 
• breaks if you bend it 
• scratches easily

Multiple Choice

Brittle means...

• bends easily 
• breaks if you bend it 
• scratches easily

Multiple Choice

The ability of a material to be shaped in all directions without cracking or breaking.

• hardness
• ductility
• malleability
• conductivity

Multiple Choice

The ability of a material to deform, usually by stretching along its length. This property allows us to make wires.

• conductivity
• ductility
• malleability
• hardness

Multiple Choice

At room temperature, most metals are

• liquid
• solid
• gas
• an alloy

Multiple Choice

What is the ability of a substance to allow heat, sound, or electricity to flow through it?

• Malleability
• Ductility
• Solubility
• Conductivity

Multiple Choice

What does malleable mean?

• able to be shaped
• will break easily
• can be used for wire
• is shiny

Multiple Choice

The mechanical property that determines a material’s

ability to withstand scratches, dents, and cuts.

• Strength

• flexbility

• hardness

• elasticity

Multiple Choice

A(n) ___________________________________________ is a characteristic that determines how a material reacts to

forces.

• physical property

• chemical property

• mechanical property

Multiple Choice

material’s ability to stretch out of shape and

return to its original shape is _______

• Strength

• Elasticity

• hardness

• flexibility

Multiple Choice

the properties that can be seen or measured without changing the materials are ____________ properties

• physical

• chemical

• mechanical

Multiple Choice

a mixture of two or more metals

• Ceramics

• composites

• Alloys

Multiple Choice

Is known as a "stretching force"

• force
• vector
• Tension
• scalar

Multiple Choice

What is a force? 

• combination of all forces acting on an object
• is a push or a full
• when life is stable
• is an arrow that represents the magnitude and direction of a quantity

Multiple Choice

An example of a mechanical property is .....

• the ability to rust.

• flexibility

• density

Multiple Choice

A material that is translucent.

• Glass

• Wood

• Rubber

Multiple Choice

A material that is translucent.

• Glass

• Wood

• Rubber

Multiple Choice

Materials that are good conductors.

• Metal

• Wood

• Rubber

Multiple Choice

Magnetism, density and conductivity are examples of ......

• Physical properties

• Chemical properties

• Mechanical properties

Multiple Choice

A characteristic that determine how a material reacts to forces.

• Physical property

• Chemical property

• Mechanical property

Multiple Choice

• X- Glass, Y- Copper, Z- Rubber

• X- Glass, Y- Rubber, Z- Copper

• X- Rubber, Y- Copper, Z- Glass

• X- Rubber, Y- Glass, Z- Copper

Multiple Select

How do you calculate elastic potential energy or work done by a spring? (Select all that apply)

• W = ½Fx

• W = ½kx²

• W = Fx

• W = ½Fx²

Multiple Select

Select all the correct units for stress.

• Pa

• Nm^-2

• Nm²

• No unit

Multiple Choice

What is the correct unit for strain?

• Pa

• Nm^-2

• No unit

• Nm²

Multiple Choice

The units for elastic potential energy are...

• Joules, J

• metres, m

• centimetres, cm

• kilograms, kg

Multiple Choice

Which of the following springs is the stiffest?

• A spring that requires a froce of 2000 N to compress it by 6.8 m.
• A spring that requires a force of 4000 N to stretch it by 9.0 m. 
• A spring that requires a force of 8000 N to compress it by 45 m.  
• A spring that requires a force of 4800 N to stretch it by 14 m.

Multiple Choice

Which letter is pointing to where the material will break?

• A

• B

• C

• D

Multiple Choice

Which letter is pointing to the elastic limit?

• A

• B

• C

• D

Multiple Choice

A wire is stretched 3 mm by a force of 150 N. Assuming the elastic limit is not exceeded, the force that will stretch the wire 5 mm is:

• 150 N

• 90 N

• 250 N

• 450 N

Multiple Choice

The limit beyond which the material does not behave elastically is known as

• Proportional limit

• Plastic limit

• Elastic limit

• Yield Point

Multiple Choice

Example of brittle material:

• iron steel

• aluminium

• concrete

• copper

Multiple Choice

Ductile materials are defined as:

• materials that can be subjected to large strains before it fractures

• materials that exhibit little or no yielding before failure

• materials that cannot be subjected to large strains

• materials that are elastic

Multiple Choice

A spring has a spring constant of 330 N/m.  How far is the spring compressed if 150 N of force are used?

• 2.2 m
• 0.0014 m
• 5.0 m
• 0.45 m

Multiple Select

Tick which point/points do you think that are obeying Hooke's Law

• Point A

• Point B

• Point C

• Point D

Multiple Choice

Which of these does not obey Hooke's Law?

• elastic deformation

• plastic deformation

Multiple Choice

A brittle material ...

• break without deforming

• changes its shape and size before breaking

Multiple Choice

True or False: Strain is the fractional change in the dimensions of the object with unit of N⁻¹.

• True

• False

Multiple Choice

True or False: Plastic deformation occurs when a material behaves within its elastic limit.

• True

• False

Multiple Choice

The force that is applied on an object must be applied ___ to the surface of the object.

• parallel

• perpendicular

• at an angle θ

Multiple Choice

Stretching occurs when ___ force is applied onto an object.

• compressive

• tensile

• radial

• explosive

Multiple Choice

Stress has the same unit as ...

• Sound intensity

• Work

• Pressure

• Strain

Multiple Choice

Increasing shearing force on a steel metal sheet results to lesser shear strain.

• True

• False

Multiple Choice

Which of the following does NOT determine shear modulus?

• Force

• Area

• Shear strain

• Volume

Multiple Choice

A 1-m long cord is pulled by a force causing its length to change by 2mm. Determine the strain.

• 0.2

• 0.02

• 0.002

Multiple Choice

A nylon string, has a diameter of 2mm, is pulled by a force of 100N. Determine the stress.

• 315 MPa

• 31.5 MPa

• 3.15 MPa

Multiple Choice

How much force is required to shear off a metal sheet whose thickness is 2mm and width of 40cm? The shear stress is 5 x 10⁷ N/m².

• 400 kN

• 40 kN

• 4 kN

Multiple Choice

Given the Young's modulus of elasticity below rank the metals according to the magnitude of tensile stress it can hold from highest to lowest.

Aluminum 69 GPa

Brass 125 GPa

Steel 200 GPa

• Aluminum, Brass, Steel

• Brass, Aluminum, Steel

• Steel, Brass, Aluminum

Multiple Choice

This refers to the ratio of tensile stress to tensile strain.

• Bulk Modulus of elasticity

• Shear Modulus of Rigidity

• Young's Modulus of elasticity

Multiple Choice

What relationship exists between applied force and strain?

• direct

• indirect

• none at all

Multiple Choice

The tensile strength of ductile materials is __________ its compressive strength.

• equal to

• less than

• greater than

• none of the above

Multiple Choice

A beam supported on more than two supports is called

• simply supported beam

• fixed beam

• overhanging beam

• continuous beam

Multiple Choice

Stress-strain diagram has five stages in the material; select the correct sequence of the stages:

• Elastic region - Yielding - Strain hardening - Necking - Fracture

• Elastic region - Strain hardening - Yielding - Necking - Fracture

• Elastic region - Yielding - Necking - Strain hardening - Fracture

• Yielding - Elastic region - Necking - Strain hardening - Fracture

Multiple Choice

Stress is divided into two categories:

• tensile and compressive

• tensile and deformation

• compressive and strain

• compressive and deformation

Multiple Choice

Stress is defined as:

• force per unit area

• force per unit length

• force per unit mass

• force per unit time

Multiple Select

What are several things would happen if stress acting upon a material exceeding its proportionality limit?

• material can retain its length/shape once the force is removed

• material cannot retain its length/shape once the force is removed

• there would be a permanent set of elongation for the material

• material does not obey Hooke's Law

Multiple Choice

What happen to the planes of atoms during upper yield point?

• Atom breaks

• Atom stay intact

• Planes of atoms starts sliding upon each other

• None of the above

Multiple Choice

A region that starts from upper yield point is called

• Elastic region

• Hooke's Law region

• Plastic region

• None of the above

Multiple Choice

Rank the points on the graphs of stress against strain from first point to final points

• proportionality limit, upper yield point, lower yield point, fracture, UTS

• proportionality limit,lower yield point, upper yield point, UTS, fracture

• lower yield point, proportionality limit, UTS, upper yield point, fracture

• None of above

Multiple Choice

Volumetric Strain is

• Increase in length / original length

• Decrease in length / original length

• Change in volume / original volume

• All of the above

Multiple Choice

Volumetric Strain is

• Increase in length / original length

• Decrease in length / original length

• Change in volume / original volume

• All of the above

Multiple Choice

Compressive Strain is

• Increase in length / original length

• Decrease in length / original length

• Change in volume / original volume

• All of the above

Multiple Choice

Which of the following is not a basic type of strain?

• Compressive strain

• Shear strain

• Volume strain

• Area strain

Multiple Choice

When tensile stress is applied axially on a circular rod its

i) diameter decreases

ii) length increases

iii) volume decreases

Which of the above are true?

• Only i

• Only ii

• i & ii

• All of The Above

Multiple Choice

When force is acting parallel to surface then the corresponding stress is known as

• Shear Stress

• Tensile stress

• Compressive stress

• Direct stress

Multiple Choice

When force is acting parallel to surface then the corresponding stress is known as

• Shear Stress

• Tensile stress

• Compressive stress

• Direct stress

Multiple Choice

Following are the basic types of stress except

• Tensile stress

• Compressive stress

• Shear stress

• Volumetric stress

Multiple Choice

2. Stress is

• External force

• Internal resistive force

• Axial force

• Radial force

Multiple Choice

Linear Strain is defined as

• Ratio of change in length to original length

• Elongation

• Decrease in length

• None of these

Multiple Choice

What is the correct label for A and B shown in the figure below?

• A - Tension; B- Compression

• A - Compression; B - Tension

• A - Torsion; B - Tension

Multiple Choice

What relationship exists between applied force and strain?

• direct

• indirect

• none at all

Multiple Choice

A cylindrical rod of cross-sectional area A experienced pressure p due to a compressive force F. If the force applied is reduced to one-third what happens to pressure?

• also reduced to one-third

• tripled

• remains the same

Multiple Choice

A change in shape in any structural component, or in the structure itself, because the material is unable to resist the force(s) acting on it is called....

• Flexibility

• Deformation

Multiple Choice

The ability of a material to be bent under force repeatedly and not fail

• Flexibility

• Deformation

Multiple Choice

Is it true that some structures need to be flexible in order to not break under the forces acting on them?

• Yes

• No

Multiple Select

Which of these are other considerations engineers look at when choosing a material? Check all that apply

• Aesthetics

• Effect on Environment

• Hardness

• Availability

Multiple Choice

If a material has "tensile strength" this means that the material is...

• Resistant to heat

• Resistant to water

• Resistant to the internal force of tension

• Resistant to the internal force of compression