Question 1

Chemical resistance tests of selected plastics shows that ____ is only slightly affected by strong acids.
A) polyamide
B) acetal
C) melamine
D) acrylic

Accepted Answer

Melamine is known for its resistance to chemicals, including strong acids, which makes it unique among the options provided. Polyamide, acetal, and acrylic are generally less resistant to strong acids compared to melamine.

Question 2

In comparing relative densities of plastics, which plastic is denser?
A) ABS
B) urethanes
C) fluoroplastics
D) polyester

Accepted Answer

Fluoroplastics are denser than ABS, urethanes, and polyester due to their molecular structure, which includes fluorine atoms that are heavier than the hydrogen and carbon atoms predominantly found in the other types of plastics listed.

Question 3

The rate at which heat energy is transferred from one molecule to another is called ____.
A) deflection temperature
B) thermal expansion
C) specific heat
D) thermal conductivity

Accepted Answer

Thermal conductivity is the property of a material to conduct heat and it measures the rate at which heat energy is transferred through a material from molecule to molecule.

Question 4

The unit of work or energy is a ____. 
A) joule
B) watt
C) hertz
D) newton

Accepted Answer

The joule is the SI unit of work or energy, representing the amount of work done when a force of one newton is applied over a displacement of one meter.

Question 5

What is the ability of a material to withstand forces pulling it apart called?  
A) tensile strength
B) modulus of elasticity
C) toughness
D) modulus of rupture

Accepted Answer

Tensile strength is the measure of a material's ability to resist breaking or failing when under tension, which means it's the capacity to withstand forces that attempt to pull it apart.

Question 6

Mechanical forces that can affect materials are measured by the formula, Force = Mass x ____.
A) height
B) weight
C) acceleration
D) pressure

Accepted Answer

The correct formula for force is Force = Mass x Acceleration, according to Newton's second law of motion.

Question 7

When a mass suspended from a test sample causes the sample to change shape over a period of time, the strain is called ____.
A) fatigue
B) stress
C) tension
D) creep

Accepted Answer

When a material changes shape over a period of time due to a constant stress, this phenomenon is referred to as creep. It is particularly observed in materials subjected to high levels of stress at elevated temperatures, but can occur at room temperature in certain materials as well.

Question 8

What is the ability to absorb or dissipate vibrations called?
A) damping
B) hardness
C) fatigue
D) None of the above

Accepted Answer

Damping is the process by which a material or system absorbs or dissipates vibrations, reducing their amplitude over time.

Question 9

Stress usually causes material to deform in length, a change known as ____.
A) a gravity constant
B) deformation
C) strain
D) strength

Accepted Answer

Strain is the correct term for the change in length or deformation of a material due to applied stress.

Question 10

The SI metric system consists of seven base units, with ____ designating the base unit for mass.   
A) candela
B) kilogram
C) meter
D) mole

Accepted Answer

The kilogram is the SI base unit for mass.

Question 11

The ratio between the stress applied and the strain within the linear range of the stress-strain curve is called the ____.  
A) modulus of rupture
B) tensile strength
C) toughness
D) modulus of elasticity

Accepted Answer

The modulus of elasticity, also known as Young's modulus, is defined as the ratio of stress to strain in the linear (elastic) region of the stress-strain curve, where the material returns to its original shape upon the removal of the stress.

Question 12

Pressure (stress) is force applied over an area. The metric unit for stress is referred to as the ____.
A) joule
B) pascal
C) newton
D) hertz

Accepted Answer

The pascal is the SI unit for pressure or stress, defined as one newton per square meter.

Question 13

The measure of how much stress (load) can be applied to a material before it breaks is ____.  
A) tensile strength
B) flexural strength
C) compressive strength
D) shear strength

Accepted Answer

The answer of The measure of how much stress (load)...

Question 14

A millimeter is ____ meter.
A) one thousandth of a
B) one hundredth of a
C) a hundred times a
D) a thousand times a

Accepted Answer

A millimeter is one thousandth of a meter, meaning there are 1,000 millimeters in a meter.

Question 15

When calculating compressive strength, the units used are multiples of the ____.
A) hertz
B) meter
C) joule
D) pascal

Accepted Answer

Compressive strength is measured in units of pressure, which is expressed in pascals (Pa) or its multiples, such as megapascals (MPa).

Question 16

Which material has the highest thermal conductivity?
A) aluminum
B) glass
C) iron
D) copper

Accepted Answer

The answer of Which material has the highest thermal conductivity?
A)...

Question 17

The value that shows how much force is needed to rupture or crush a material is known as ____.
A) toughness
B) tensile strength
C) compressive strength
D) modulus of elasticity

Accepted Answer

Compressive strength is the value that indicates how much force is needed to crush a material. It measures the material's ability to withstand loads that tend to reduce size.

Question 18

Which material has the highest viscosity?
A) molasses
B) water
C) kerosene
D) corn syrup

Accepted Answer

Molasses has the highest viscosity because it is a thick, sticky liquid.

Question 19

Which plastics material has the highest thermal expansion value?
A) phenol-formaldehyde
B) silicones
C) polyethylene
D) epoxy

Accepted Answer

Polyethylene has the highest thermal expansion value among the options given. This is because it is a semi-crystalline material and its molecular structure allows for more movement when heated, leading to a higher thermal expansion compared to more rigid, cross-linked polymers like phenol-formaldehyde, silicones, and epoxy.

Question 20

The measure of the ability of a material to support combustion is called ____.
A) self-extinguishment
B) flammability
C) melt index
D) ablative index

Accepted Answer

Flammability is the measure of the ability of a material to support combustion, indicating how easily a substance can catch fire and burn.

Quiz 6: Properties and Tests of Selected Plastics

Chemical resistance tests of selected plastics shows that ____ is only slightly affected by strong acids.

In comparing relative densities of plastics, which plastic is denser?

The rate at which heat energy is transferred from one molecule to another is called ____.

The unit of work or energy is a ____.

What is the ability of a material to withstand forces pulling it apart called?

Mechanical forces that can affect materials are measured by the formula, Force = Mass x ____.

When a mass suspended from a test sample causes the sample to change shape over a period of time, the strain is called ____.

What is the ability to absorb or dissipate vibrations called?

Stress usually causes material to deform in length, a change known as ____.

The SI metric system consists of seven base units, with ____ designating the base unit for mass.

The ratio between the stress applied and the strain within the linear range of the stress-strain curve is called the ____.

Pressure (stress) is force applied over an area. The metric unit for stress is referred to as the ____.

The measure of how much stress (load) can be applied to a material before it breaks is ____.

A millimeter is ____ meter.

When calculating compressive strength, the units used are multiples of the ____.

Which material has the highest thermal conductivity?

The value that shows how much force is needed to rupture or crush a material is known as ____.

Which material has the highest viscosity?

Which plastics material has the highest thermal expansion value?

The measure of the ability of a material to support combustion is called ____.