Which of the following describes the science of sound in buildings?

• lighting

• acoustics

• ventilation

• resonance

The unit of sound intensity is:

• lumen

• decibel (dB)

• candela

• watt

The time required for sound to decay 60 dB after the source has stopped is called:

• reflection time

• absorption rate

• reverberation time

• resonance period

In auditoriums, excessive reverberation causes:

• better clarity

• poor speech intelligibility

• improved acoustics

• higher sound absorption

Which building material has the highest sound absorption coefficient?

• glass

• concrete

• mineral wool

• marble

The optimum reverberation time for a classroom is around:

• 0.2-0.4 seconds

• 0.6-0.8 seconds

• 1.5-2.0 seconds

• 3.0 seconds

Sound transmission through walls is measured by:

• lux level

• sound transmission class (STC)

• noise reduction coefficient (NRC)

• resonance index

Which frequency range is most important for speech intelligibility?

• 20-50 Hz

• 500-4000 Hz

• 8000-12000 Hz

• 15000-20000 Hz

Which shape is most prone to focusing sound reflections?

• rectangular

• concave

• convex

• triangular

The echo effect occurs when reflected sound reaches the listener after:

• 0.01 seconds

• 0.05 seconds

• 0.1 seconds or more

• 1 second