NCIDQ IDFX final Exam Questions and
Answers with Verified Solutions | Latest
Updated 2026
What is a safety data sheet Document provided by a manufacturer
(SDS)? 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 The hertz is the unit of measure for this
frequency of sound? and is equal
to one cycle per second (Hz)
,What is the unit of measure for The decibel (dB) is the unit of measure for
sound this.
intensity, based on a logarithmic
scale?
What do most people perceive When a sound increases by this amount,
when a sound increases by 10 most
dB? people perceive a doubling in loudness.
What frequency range can be This range is 20 Hz to 20,000 Hz.
heard
by most healthy young people?
What is the coefficient of This is the ratio of the sound intensity
absorption? absorbed by
a material to the total sound intensity
reaching the
material.
What is the noise reduction This is a single-number average of a
coefficient (NRC)? 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 This is a single-number measure of the
class transmission
(CAC)? loss through ceiling tiles between two
closed
rooms where there is no barrier above the
suspended ceiling.
What percentage range of a 30% to 40% of a commercial buildings
commercial building's total energy total energy
use is typically devoted to electric use is typically devoted to this.
lighting and the cooling it requires?
What are the 3 most common The 3 most common types are: Float,
types Tempered,
of interior glazing? and Laminated
What are the primary elements Copper and tin are used to make this
used material.
to make bronze?
What is a concrete masonry unit? This building product, abbreviated CMU, is
also
commonly known as concrete block.
Answers with Verified Solutions | Latest
Updated 2026
What is a safety data sheet Document provided by a manufacturer
(SDS)? 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 The hertz is the unit of measure for this
frequency of sound? and is equal
to one cycle per second (Hz)
,What is the unit of measure for The decibel (dB) is the unit of measure for
sound this.
intensity, based on a logarithmic
scale?
What do most people perceive When a sound increases by this amount,
when a sound increases by 10 most
dB? people perceive a doubling in loudness.
What frequency range can be This range is 20 Hz to 20,000 Hz.
heard
by most healthy young people?
What is the coefficient of This is the ratio of the sound intensity
absorption? absorbed by
a material to the total sound intensity
reaching the
material.
What is the noise reduction This is a single-number average of a
coefficient (NRC)? 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 This is a single-number measure of the
class transmission
(CAC)? loss through ceiling tiles between two
closed
rooms where there is no barrier above the
suspended ceiling.
What percentage range of a 30% to 40% of a commercial buildings
commercial building's total energy total energy
use is typically devoted to electric use is typically devoted to this.
lighting and the cooling it requires?
What are the 3 most common The 3 most common types are: Float,
types Tempered,
of interior glazing? and Laminated
What are the primary elements Copper and tin are used to make this
used material.
to make bronze?
What is a concrete masonry unit? This building product, abbreviated CMU, is
also
commonly known as concrete block.
