Deck 1: Understanding Sound and Acoustics in Building Design

Question 1

The ratio of the total floor area inclusive of all the floors to the area of the plot on which building stands is known as ___________

A)groundage
B)plot area
C)floor area
D)built-up area

Answer 1

built-up area

Question 2

Which of the following is not a characteristic of sound?

A)intensity
B)frequency
C)speed
D)quality

Answer 2

speed

Question 3

Sound travels faster in gases than in solids.

Answer 3

False

Question 4

The velocity of sound in bricks is __________

A)1450 m/sec
B)343 m/sec
C)3000 m/sec
D)4300 m/sec

Question 5

The intensity of sound is proportional to __________ of amplitude.

A)square root
B)cube root
C)square
D)cube

Question 6

Which of the following relations between loudness and intensity is correct?

A)i ? log l
B)i ? log l2
C)l ? log i
D)l ? log i2

Question 7

Which law states that the magnitude of a sensation is directly proportional to the logarithm of the physical stimulus producing it?

A)beer-lambert law
B)huygens-fresnel law
C)lorentz law
D)weber and fechner's law

Question 8

The intensity of sound depends on the ear of the listener.

Question 9

The amount of sound transmitted outside a room depends on the surface while the amount of
sound reflected or absorbed depends on the sound insulation properties of the surface.

Question 10

Which of the following statements is correct?

A)pitch of the sound increases with increase in frequency
B)pitch of the sound decreases with increase in frequency
C)decibel is equal to 1/100 of bel
D)increase in the amplitude of the sound decreases the intensity

Question 11

For an echo to be distinguished as separate, it should reach the ear _________ of a second after the direct sound.

A)one-fourth
B)one-fifth
C)one-eighth
D)one-tenth

Question 12

Reverberation time is directly proportional to ____________

A)effective surface area
B)lateral surface area
C)volume of the room
D)shape of the room

Question 13

In the Sabine's expression for reverberation time t=0.16V/A, A represents __________

A)area of the room
B)volume of the room
C)total absorbing power
D)total adsorbing power

Question 14

Reverberation time is independent of the shape of the room.

Question 15

The absorption of a surface is the product of the __________ of the surface and its absorption coefficient.

A)length
B)area
C)volume
D)width

Question 16

Calculate the transmission loss given the sound levels measured on either side of the wall is 60 dB and 40 dB.

A)20 db
B)100 db
C)60 db
D)2400 db

Question 17

Hard materials used for sound insulation are good absorbers.

Question 18

In rigid homogeneous walls, the transmission loss of a one-brick wall is _________

A)10 db
B)20 dbc.
C)50 db
D)70 db

Question 19

In cavity wall construction for soundproofing, the width of the cavity should be at least _________

A)3 cm
B)5 cm
C)8 cm
D)12 cm

Question 20

The sound insulation offered by rigid homogenous walls decreases with the increase in the
thickness of the wall.

Question 21

Concrete floor floating construction provides good insulation against __________ sounds.

A)impact
B)air-borne
C)water-borne
D)structural

Question 22

If the direction of the wind is at 90° to one of the faces, positive pressure will be produced on __________

A)windward face
B)leeward face
C)two windward faces
D)two leeward faces

Question 23

Ventilation arising from the temperature difference between outside and inside takes place due to ____________ effect.

A)stack
B)stark
C)zeeman
D)spark

Question 24

The maximum rate of air change is __________

A)30 per min
B)30 per hour
C)60 per min
D)60 per hour

Question 25

The general temperature difference between inside and outside of a room is not more than ____________

A)3°c
B)5°c
C)6°c
D)8°c