NCIDQ IDFX Exam | Questions with 100% Correct Answers | Updated &Verified | 2024-
2025 | 100% Score
What is a safety data sheet (SDS)? - ✔✔Document provided by a manufacturer containing info about the
physical makeup of a substance, proper storage and handling procedures, and other safety issues.
Define composite wood veneer. - ✔✔Product made by slicing readily available, fast-growing trees into
veneers, dyeing the veneers, and then gluing them together to create an artificial log. The log is then re
sliced to produce a variety of wood veneers.
Define clerestory. - ✔✔Vertically glazed area placed between 2 different roof levels to admit natural
light.
What is the unit of measure for the frequency of sound? - ✔✔The hertz is the unit of measure for this
and is equal to one cycle per second (Hz)
What is the unit of measure for sound intensity, based on a logarithmic scale? - ✔✔The decibel (dB) is
the unit of measure for this.
What do most people perceive when a sound increases by 10 dB? - ✔✔When a sound increases by this
amount, most people perceive a doubling in loudness.
What frequency range can be heard by most healthy young people? - ✔✔This range is 20 Hz to 20,000
Hz.
What is the coefficient of absorption? - ✔✔This is the ratio of the sound intensity absorbed by a
material to the total sound intensity reaching the material.
What is the noise reduction coefficient (NRC)? - ✔✔This is a single-number average of a material's
coefficients of absorption at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz, rounded to the nearest 0.05.
,What is reverberation time? - ✔✔This is the time it takes for the sound level in a space to decrease 60
dB after the source has stopped producing the sound.
What is the ceiling attenuation class (CAC)? - ✔✔This is a single-number measure of the transmission
loss through ceiling tiles between two closed rooms where there is no barrier above the suspended
ceiling.
What percentage range of a commercial building's total energy use is typically devoted to electric
lighting and the cooling it requires? - ✔✔30% to 40% of a commercial buildings total energy use is
typically devoted to this.
What are the 3 most common types of interior glazing? - ✔✔The 3 most common types are: Float,
Tempered, and Laminated
What are the primary elements used to make bronze? - ✔✔Copper and tin are used to make this
material.
What is a concrete masonry unit? - ✔✔This building product, abbreviated CMU, is also commonly
known as concrete block.
What is mean radiant temperature? - ✔✔This is a measure of the heat a person gains from or loses to
his or her surroundings through radiation. It is used in assessing how comfortable a room is.
The value is a weighted average of the various surface temperatures in a room (taking into account an
occupant's angle of exposure to these surfaces) and any sunlight present.
What is the standard depth of metal studs? - ✔✔Standard depth for these construction components are
1 5/8", 2 1/2", 3 5/8", 4", and 6" (41, 64, 92, 102, and 152 mm)
What is the generic name for fire-rated gypsum wallboard? - ✔✔Type X is the generic name of this
material.
, What are 4 advantages of using Portland cement plaster as a finish material? - ✔✔As a finish material,
this has the advantages of being:
- hard and abrasion resistant
- water resistant
- easily formed into curves and ornate surfaces
- a good base for wall tile
What are 4 disadvantages of using portland cement plaster as a finish material? - ✔✔As a finish
material, this has the disadvantages of being:
- more expensive than gypsum wallboard
- slower to construct than gypsum wallboard
- wet and messy to work with
- challenging to work with, this requiring more-skilled labor
What is a pivot? - ✔✔This is a type of hardware used to hang doors. It consists of a rotating bottom pin
and a corresponding pin at the top of the door.
In regards to construction, what is a plenum? - ✔✔In commercial construction, this is the space
between the building structural roof or floor and the suspended ceiling
What effect does acoustical ceiling have on sound? - ✔✔This construction element mainly absorbs
sound.
Stainless steel is primarily an alloy of steel and an additional element. Which one? - ✔✔Chromium is
added to steel to create this material.
What process occurs when dissimilar metals are in contact in the presence of water? - ✔✔The process
that occurs under these conditions is galvanic action.
Galvanic action is a form of electrochemical corrosion in which one metal gives up electrons to the
other, corroding quickly while slowing the other metal's corrosion
2025 | 100% Score
What is a safety data sheet (SDS)? - ✔✔Document provided by a manufacturer containing info about the
physical makeup of a substance, proper storage and handling procedures, and other safety issues.
Define composite wood veneer. - ✔✔Product made by slicing readily available, fast-growing trees into
veneers, dyeing the veneers, and then gluing them together to create an artificial log. The log is then re
sliced to produce a variety of wood veneers.
Define clerestory. - ✔✔Vertically glazed area placed between 2 different roof levels to admit natural
light.
What is the unit of measure for the frequency of sound? - ✔✔The hertz is the unit of measure for this
and is equal to one cycle per second (Hz)
What is the unit of measure for sound intensity, based on a logarithmic scale? - ✔✔The decibel (dB) is
the unit of measure for this.
What do most people perceive when a sound increases by 10 dB? - ✔✔When a sound increases by this
amount, most people perceive a doubling in loudness.
What frequency range can be heard by most healthy young people? - ✔✔This range is 20 Hz to 20,000
Hz.
What is the coefficient of absorption? - ✔✔This is the ratio of the sound intensity absorbed by a
material to the total sound intensity reaching the material.
What is the noise reduction coefficient (NRC)? - ✔✔This is a single-number average of a material's
coefficients of absorption at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz, rounded to the nearest 0.05.
,What is reverberation time? - ✔✔This is the time it takes for the sound level in a space to decrease 60
dB after the source has stopped producing the sound.
What is the ceiling attenuation class (CAC)? - ✔✔This is a single-number measure of the transmission
loss through ceiling tiles between two closed rooms where there is no barrier above the suspended
ceiling.
What percentage range of a commercial building's total energy use is typically devoted to electric
lighting and the cooling it requires? - ✔✔30% to 40% of a commercial buildings total energy use is
typically devoted to this.
What are the 3 most common types of interior glazing? - ✔✔The 3 most common types are: Float,
Tempered, and Laminated
What are the primary elements used to make bronze? - ✔✔Copper and tin are used to make this
material.
What is a concrete masonry unit? - ✔✔This building product, abbreviated CMU, is also commonly
known as concrete block.
What is mean radiant temperature? - ✔✔This is a measure of the heat a person gains from or loses to
his or her surroundings through radiation. It is used in assessing how comfortable a room is.
The value is a weighted average of the various surface temperatures in a room (taking into account an
occupant's angle of exposure to these surfaces) and any sunlight present.
What is the standard depth of metal studs? - ✔✔Standard depth for these construction components are
1 5/8", 2 1/2", 3 5/8", 4", and 6" (41, 64, 92, 102, and 152 mm)
What is the generic name for fire-rated gypsum wallboard? - ✔✔Type X is the generic name of this
material.
, What are 4 advantages of using Portland cement plaster as a finish material? - ✔✔As a finish material,
this has the advantages of being:
- hard and abrasion resistant
- water resistant
- easily formed into curves and ornate surfaces
- a good base for wall tile
What are 4 disadvantages of using portland cement plaster as a finish material? - ✔✔As a finish
material, this has the disadvantages of being:
- more expensive than gypsum wallboard
- slower to construct than gypsum wallboard
- wet and messy to work with
- challenging to work with, this requiring more-skilled labor
What is a pivot? - ✔✔This is a type of hardware used to hang doors. It consists of a rotating bottom pin
and a corresponding pin at the top of the door.
In regards to construction, what is a plenum? - ✔✔In commercial construction, this is the space
between the building structural roof or floor and the suspended ceiling
What effect does acoustical ceiling have on sound? - ✔✔This construction element mainly absorbs
sound.
Stainless steel is primarily an alloy of steel and an additional element. Which one? - ✔✔Chromium is
added to steel to create this material.
What process occurs when dissimilar metals are in contact in the presence of water? - ✔✔The process
that occurs under these conditions is galvanic action.
Galvanic action is a form of electrochemical corrosion in which one metal gives up electrons to the
other, corroding quickly while slowing the other metal's corrosion
