NCIDQ IDFX - Topic 7 Exam Questions And
Answers Latest 2025
What is a safety data sheet (SDS)? -
correct answer ✅This is a document provided by a manufacture
containing information about the physical make up of a substance,
proper storage and handling procedures, and other safety issues.
What is a composite wood veneer? -
correct answer ✅This is a 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.
What is a clerestory? -
correct answer ✅This is a vertically glazed area placed between
two different roof levels to admit natural light.
What is the unit of measure for the frequency of sound? -
correct answer ✅The Hertz (Hz) is the unit of measure for this and
is equal to one cycle per second.
What is a unit of measure for sound intensity, based on the
logarithmic scale? -
correct answer ✅The decibel (dB) is the unit of measure for this.
, NCIDQ IDFX - Topic 7 Exam Questions And
Answers Latest 2025
What do you most people perceive one sound increases by 10 dB? -
correct answer ✅When it sound increases by this amount, most
people perceive a doubling in loudness.
What frequency range can be heard by most healthy young people?
-
correct answer ✅This range is 20 Hz to 20,000 Hz
What is the coefficient of absorption? -
correct answer ✅This is the ratio of sound intensity absorbed by a
material to the total sound intensity reaching the material.
What is the noise reduction coefficient (NRC)? -
correct answer ✅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? -
correct answer ✅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.
Answers Latest 2025
What is a safety data sheet (SDS)? -
correct answer ✅This is a document provided by a manufacture
containing information about the physical make up of a substance,
proper storage and handling procedures, and other safety issues.
What is a composite wood veneer? -
correct answer ✅This is a 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.
What is a clerestory? -
correct answer ✅This is a vertically glazed area placed between
two different roof levels to admit natural light.
What is the unit of measure for the frequency of sound? -
correct answer ✅The Hertz (Hz) is the unit of measure for this and
is equal to one cycle per second.
What is a unit of measure for sound intensity, based on the
logarithmic scale? -
correct answer ✅The decibel (dB) is the unit of measure for this.
, NCIDQ IDFX - Topic 7 Exam Questions And
Answers Latest 2025
What do you most people perceive one sound increases by 10 dB? -
correct answer ✅When it sound increases by this amount, most
people perceive a doubling in loudness.
What frequency range can be heard by most healthy young people?
-
correct answer ✅This range is 20 Hz to 20,000 Hz
What is the coefficient of absorption? -
correct answer ✅This is the ratio of sound intensity absorbed by a
material to the total sound intensity reaching the material.
What is the noise reduction coefficient (NRC)? -
correct answer ✅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? -
correct answer ✅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.
