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NCIDQ IDFX - Topic 7 questions with complete solutions graded A+
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NCIDQ IDFX - Topic 7 questions with complete solutions graded A+
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NCIDQ IDFX - Topic 7What 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.
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.
What is the ceiling attenuation class (CAC)? - correct answer ✔✔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 buildings total energy use is typically devoted to electric lighting
and the cooling it requires? - correct answer ✔✔30% to 40% of a commercial buildings total energy use
is typically devoted to this.
What are the three most common types of interior glazing? - correct answer ✔✔The three most
common types are
float
tempered
laminated
What are the primary elements used to make bronze? - correct answer ✔✔Copper and tin are used to
make this material
What is a concrete Masonary unit? - correct answer ✔✔This building product, abbreviated CMU, is
usually commonly known as concrete block.
What is mean radiant temperature? - correct answer ✔✔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 are the standard depths of metal studs? - correct answer ✔✔Standard depths for these
construction components are 1 5/8", 2 1/2", 3 5/8", 4" and 6"
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