Reference: Hodge-podge

SAMONIAN DIGITAL LIBRARY

Dubai, United Arab Emirates

ITEM QUESTION & CHOICES ANSWER REMARK

1

2 Types of Wave Interference: What is the type of interference that occurs at any

location along the medium where the two interfering waves have a displacement

in the same direction? A. Constructive Interference B. Destructive Interference

C. Fluctuating Interference D. Merging Interference

A

2

2 Types of Wave Interference: What is the type of interference that occurs at any

location along the medium where the two interfering waves have a displacement

in the opposite direction. A. Constructive Interference B. Destructive Interference

C. Fluctuating Interference D. Merging Interference

B

3

What is the non-reflective, non-echoing or echo-free room designed to completely absorb reflections of

either sound or electromagnetic waves? A. Unanechoic Chamber B. Anechoic Chamber C. Anaechoic

Chamber D. Plenum Chamber B

4 In acoustics, what is the human ears response to pressure fluctuations in the air caused by vibrating objects? A. Sound B. Wave C. Interference D. Wave Interference A

5 Cycles per second is what? A. Reverberation B. Wavelength Cycle C. Frequency D. Decay Rate C

6 Persistence of sound is what? A. Attenuation B. Resonance C. Reverberation D. Phon C

7 What is the unit of sound absorption? A. Phon B. Phone C. Decibel D. Sabin D

8 Handbook of the Speed of Sound in Real Gases by AJ Zuckerwar 2002: In dry air, if the speed of sound is

356 m/s at 40 C, what is the speed of sound at 20 C? A. 344 m/s B. 326.00 m/s C. 327 m/s D. 319 m//s A

9

S represents the light source, while r represents the measured points. The lines

represent the flux emanating from the source. The total number of flux

lines depends on the strength of the source and is constant with increasing

distance. A greater density of flux lines (lines per unit area) means a stronger

field. The density of flux lines is inversely proportional to the square of the

distance from the source because the surface area of a sphere increases with

the square of the radius. Thus the strength of the field is inversely proportional to

the square of the distance from the source. A. Threshold of Audibility B. Inverse-

Square Law B. Sound Diffraction D. Threshold of Hearing

B

10 What is watt per square meter (W/m2)? A. Sound Intensity B. Sound power C. Sound Absorption D.

Sound Isolation E. Sound Insulation A

11

In common term, what is the Absolute Threshold of Hearing (ATH) which is the minimum sound level of a

pure tone that an average ear with normal hearing can hear with no other sound present, equal to

10 -12 W/m2? A. Threshold of Normal Pain B. Threshold of Hearing C. Threshold of Audibility C

12

Proposed in DIN 45631 and ISO 532 B by SS Stevens for its purpose is to compensate for the effect of

frequency on the perceived loudness of tones, what is the unit of loudness level for pure tone? A. Sone B.

Phon C. Decibel D. Helmholtz Resonator B

13 Which does not influence the Reverberation Time (RT)? A. None of the Above B. Volume of the room C.

All of the Above D. Sound absorbing qualities of the rooms surfaces E. Number of people and furniture A

14 It is recommended that the surfaces of the front part of an auditorium must be highly reflective to reinforce

direct sound and throw it to the rear of the room? A. Flutter Echo B. Echo C. Prolonged Reverberation B

15

What is the reinforcement of certain sound frequencies due to sympathetic vibrations, especially the

acoustical defect in enclosed rooms with highly reflective surfaces? A. Attenuation B. Resonance C.

Sound Reinforcement D. Cloud B

DIRECTION: Select the best answer.

EXAMINEE: RATING: TOPIC CODE: AC 01-02 ARCHITECTURAL ACOUSTICS

01

Reference: Hodge-podge

SAMONIAN DIGITAL LIBRARY

Dubai, United Arab Emirates

ITEM QUESTION & CHOICES ANSWER REMARK

16 What is a rapid series of echoes (as in broadcast and recording studios) originating in reflection between

two parallel surfaces? A. Echo B. Attenuation C. Flutter D. Sound Bounce C

17

Sound may also transmit through the wall of the ducting and into the room through which the ductwork is

traveling, what do you call this noise which results from both air-borne and structure-borne noise which

has developed in the system? A. Break-in Noise B. Break-out Noise C. Break-on Noise D. Break-through B

18 What is the noise that can break into ductwork through the duct wall in one room and propagate along the

duct into adjacent rooms? A. Break-in Noise B. Break-out Noise C. Break-on Noise D. Break-through A

19 What is the reduction of sound level? A. Reverberation B. Attenuation C. Consonance D. Resonance B

20 What indicates how much of the sound is absorbed in the actual material? A. Transmission Loss B.

Decay Rate C. Sound Absorption Coefficient D. Reverberation Time C

21

What is the bending of waves around small obstacles and the spreading out

of waves beyond small openings or leak? A. Refraction B. Rarefaction C. Diffraction D. Deflection

C

22 What is sound reflected back with sufficient time delay? A. Flutter B. Echo C. Reverberation D. Reverbed B

23

Bats can produce and detect what kind of sound waves which when produced on reflection from the

obstacles like building would guide them to remain away from the obstacles during night? A. Ultrasonic B.

Infrasonic C. Midrange Wave D. High-Intensity Sound Wave A

24 An anechoic chamber is an example of what? A. Live Room B. Dead Room C. Sound-absorbing Room B

25 When there is a reverberation, and low attenuation of low frequency, the room is what? A. Live Room B.

Dead Room C. Attenuated Room A

26

What is the addition of sound created by special digital generators and distributed by normally unseen

speakers through an area to reduce distractions or provide confidentiality where needed? A. Sound

Proofing B. Sound Breaking C. Sound Masking D. Incrementalism C

27

What is the arithmetic average, rounded to the nearest multiple of 0.05, of the absorption coefficients for a

specific material and mounting condition determined at the one octave band center frequencies of 250,

500, 1000 and 2000 Hz? A. Noise Reduction Coefficient (NRC) B. Noise Reduction (NR) C. Noise

Isolation Class (NIC) D> Outdoor-Indoor Transmission Class (OITC)

A

28

What is a phenomenon that consists of a given system being driven by another vibrating system of by

external forces to oscillate with greater amplitude at some preferential frequencies? A. Damping B.

Attenuation C. Nuclear Magnetic Resonance (NMR) D. Resonance D

29

What is an integer rating of how well a building partition attenuates airborne sound, which at some

countries like USA, it is widely used to rate interior partitions, ceiling/floors, doors, windows and exterior

wall configurations (ASTM E413 and E90)? A. Sound Intensity Level (SIL) B. Sound Transmission Level

(STL) C. Sound Transmission Class (STC) D. Sound Intensity (SI)

C

30 Materials like what are great for sound isolation? A. Masonry & Concrete B. Foams C. Sound Curtains A

31 If you are going to use wood as denser sound isolator on interior partitions, what type should you use? A.

Medium-Density Fiberboard (MDF) B. 4 Plyboard C. High-Density Fiberboard (HDF) D. Corkboard C

DIRECTION: Select the best answer.

EXAMINEE: RATING: TOPIC CODE: AC 01-02 ARCHITECTURAL ACOUSTICS

02

Reference: Hodge-podge

SAMONIAN DIGITAL LIBRARY

Dubai, United Arab Emirates

ITEM QUESTION & CHOICES ANSWER REMARK

32

Which material can be used to absorb sound by slowing the velocity of the air particles carrying the wave,

like when in the pressure zone of a sound wave? A. Rook Wool & Fiberglass B. Carpet Tiles C. Panel

Absorbers D. Plastics & Rubbers (Neoprene) E. Fabrics A

33

Most rooms have their fundamental resonances in the 20 Hz to 200 Hz region, each frequency being

related to one or more of the rooms dimensions or a divisor thereof. Collection of resonance is called what? A. Anechoic Chamber B. Room Flutter C. Room Mode D. Intensification

C

34

When two waves interfere, the resulting displacement of the medium at any location is the algebraic sum

of the displacements of the individual waves at that same location. A. Principle of Displacement B.

Inverse-Square Law C. Principle of Wave Interference D. Principle of Superposition D

35 3 Calculations of Room Modes by Geometry: What is the mode involving 2

surfaces of a room? A. Oblique Mode B. Axial Mode C. Tangential Mode A

36 3 Calculations of Room Modes by Geometry: What is the mode involving 4

surfaces of a room? A. Oblique Mode B. Axial Mode C. Tangential Mode C

37 3 Calculations of Room Modes by Geometry: What is the mode involving 6

surfaces of a room? A. Oblique Mode B. Axial Mode C. Tangential Mode A

38 Dissipating sound is what? A. Sound Deflection B. Sound Refraction C. Sound Absorption C

39

The sound-absorbing coefficients for a given material may vary depending on the following except:

A. Thickness of the material B. How it is supported or mounted C. Depth of the air space behind the

material D. Facing in front of the material E. None of the Above E

40

The more sound absorption (sabins) inside a room, the lower the noise levels (approaching the drop-off

with distance outdoors. A. True B. False C. Sometimes noise level is constant depending on the

consistency of materials used D. Both B and C A

41

What is the property of a material or construction system that blocks the transfer of sound energy from

one side to another? A. Transmission Loss (TL) B. Sound Absorption C. Sound Absorbing Coefficient

(SAC) D. Sound Transmission Class (STC) A

42

What is a rating system designed to combine TL values from many frequencies of different construction

materials? A. Transmission Loss (TL) B. Sound Absorption C. Sound Absorbing Coefficient (SAC) D.

Sound Transmission Class (STC) D

43 ____ depends on the properties of a room and is the actual difference in sound pressure level between

two spaces. A. Noise Reduction Coefficient (NRC) B. Noise Reduction (NR) C. Transmission Loss (TL) B

44

A. Isolation Board

B. Weatherproofing

C. Batt Insulation

D. Resilient Channel

E. Gypsum Board

F. Furring

A

DIRECTION: Select the best answer.

EXAMINEE: RATING: TOPIC CODE: AC 01-02 ARCHITECTURAL ACOUSTICS

03