Deck 7: Understanding Sound and Noise Pollution

Question 1

Main sources of noise pollution are

A)Transportation equipment only
B)Heavy machinery only
C)Musical instruments
D)Transportation equipment and heavy machinery

Answer 1

Transportation equipment and heavy machinery

Question 2

The sound can travel in air when:

A)Particles of medium travel from one place to another
B)There is no moisture in the atmosphere
C)Disturbance travel from one place to another
D)Both particles as well as disturbance travel from one place to another

Answer 2

Disturbance travel from one place to another

Question 3

White noise is random noise that has a audible frequency rangefrom

A)320 to 100 KHz
B)20 to 20KHtz
C)120 to 20KHtz
D)220 to 20KHtz

Answer 3

20 to 20KHtz

Question 4

Which among the following has a constant power spectral density over a wide frequency range?

A)White noise
B)Black noise
C)Pink noise
D)Blue noise

Question 5

Which is correct option for ear protection equipment?

A)Headphone
B)Use of cotton in ears
C)Ear defeders ,Ear plugs
D)All the above

Question 6

The technique or method to absorb undesirable sounds by soft and porous

A)Acoustic protection
B)Unacoustic protection
C)Audible protection
D)Decibel protection

Question 7

When sound interacts with materials and boundaries, it displays all the

A)Heat
B)Waves
C)Light
D)Electricity

Question 8

Soft materials absorb a large amount of

A)Heat energy
B)Light energy
C)Electromagnetic waves
D)Sound energy

Question 9

Reflection coefficient (?) is the rario of intensity of sound ______________.

A)Reflected / Incident.
B)Incident / Reflected.
C)Absorbed / Reflected.
D)None of the above.

Question 10

Absorption coefficient (?) is the rario of intensity of sound ______________.

A)Absorbed / Incident.
B)Incident / Reflected.
C)Absorbed / Incident
D)None of the above.

Question 11

Which best describe the sound wave?

A)It may be longitudinal
B)It is always transverse
C)It is always longitudinal
D)All of the above

Question 12

Which of the following can not travel through a vacuum?

A)Electromagnetic wave
B)Radio wave
C)Sound wave
D)Light wave

Question 13

Sound wave has two main characteristics which are

A)Pitch and loudness
B)Tone and loudness
C)Highness and loudness
D)Rarefaction and compression

Question 14

When waves bend away from straight lines of travel, it is called

A)Reflection
B)Diffraction
C)Rarefaction
D)Refraction

Question 15

_________ is the sound power measured over the area upon which is received.

A)Sound pressure
B)Sound energy
C)Sound intensity
D)Sound pressure level

Question 16

It is an audio transducer that converts acoustic pressure in air into its equivalent electrical impulses

A)Loudspeaker
B)Amplifier
C)Baffle
D)Microphone

Question 17

_________ is a pressure type microphone with permanent coil as a transducing element.

A)Dynamic
B)Condenser
C)Magnetic
D)Carbon

Question 18

A capacitor stores energy in the form of an electrostatic field is a ______.

A)Dynamic Microphone
B)Condenser Microphone
C)Magnetic Microphone
D)Carbon Microphone

Question 19

A microphone that uses the piezoelectric effect

A)Dynamic
B)Condenser
C)Crystal
D)Carbon

Question 20

It describes the output of a microphone over a range of frequencies.

A)Directivity
B)Sensitivity
C)Frequency response
D)All of the above

Question 21

The most important terms that are used to describe the sound field around a sound emitting object

A)Far , Near Field
B)Free ,Diffuse Field
C)A and B both
D)None of the above

Question 22

The sound waves behave in a much more complex fashion, and there is no fixed relationship between ________________.

A)Sound pressure
B)pressure and distance
C)Sound energy
D)Sound intensity

Question 23

The sound far field is beginning at a distance of ____________ .

A)pressure and distance
B)Sound energy
C)Sound pressure
D)2 wavelengths away from the sound source

Question 24

Measurement of noise can be made in following environment ____________

A)Anechoic Chamber
B)Semi - anechoic Chamber
C)Reverberant Chamber
D)All the above