REHS Exam |Questions and Verified
Answers| 100% Correct |Grade A (NEW
2023/ 2024 Update)
QUESTION
What size particle can reach the lowest parts of the lung?
a. 10 microns
b. 25 microns
c. 2.5 microns
d. any size particle
Answer:
2.5 microns
QUESTION
Street dust would be considered what type of pollution?
a. paradox pollutant
b. fugitive pollutant
c. uncontrolled pollutant
d. laps rate
Answer:
fugitive pollutant
QUESTION
A primary pollutant is
a. one that is formed in the atmosphere as a result of reactions such as hydrolysis, oxidation, and
photochemistry
b. one that is found in the atmosphere due to natural reactions
c. one that is found in the atmosphere in the same form as it exists
Answer:
one that is found in the atmosphere due to natural reactions
,QUESTION
How are total suspended particles measured?
a. flame photometry and weighing
b. gas filtration
c. flame ionization
d. collection and weighing
Answer:
collection and weighing
QUESTION
Which of the following inversions develop at night under conditions of relatively clear skies and
very light
winds?
a. subsidence inversion
b. frontal inversion
c. radiational inversion
d. stack emission inversion
Answer:
radiational inversion
QUESTION
The pitch of a sound is determined primarily by
a. frequency
b. wavelengths
c. sound pressure
d. all of the above
Answer:
frequency
QUESTION
The distance that a sound wave travels in on cycle of period is the
,a. sound intensity
b. wavelength of the sound
c. sound pressure
d. frequency
Answer:
wavelength of the sound
QUESTION
The speed with which sound travels through a particular medium is dependent on
a. the compressibility of the medium
b. the density of the medium
c. the compressibility and density of the medium
d. none of the above
Answer:
the density of the medium
QUESTION
A __________is a dimensionless unit to express physical intensity or sound pressure levels.
a. noise level
b. decibel
c. hertz
d. sound pressure level (SPL)
Answer:
decibel
QUESTION
If 10 decibels is 10 times more intense than one decibel, how many times more intense in 20
decibels than
one decibel?
a. 20
b. 30
c. 100
d. 1000
, Answer:
100
QUESTION
The first Federal standards for occupational exposure to noise were issued by
a. the Department of Transportation
b. the Federal Aviation Administration
c. the Department of Housing and Urban Development
d. the Department of Labor
Answer:
the Department of Labor
QUESTION
The shorter the wave length
a. the higher the frequency and lower the energy
b. the lower the frequency and energy
c. the lower the frequency and higher the energy
d. the higher the frequency and energy
Answer:
the higher the frequency and energy
QUESTION
The roentgen is a measure of the ionization in air produced by exposure to
a. x-rays or gamma rays
b. alpha particles
c. beta particles
d. all of the above
Answer:
x-rays or gamma rays
Answers| 100% Correct |Grade A (NEW
2023/ 2024 Update)
QUESTION
What size particle can reach the lowest parts of the lung?
a. 10 microns
b. 25 microns
c. 2.5 microns
d. any size particle
Answer:
2.5 microns
QUESTION
Street dust would be considered what type of pollution?
a. paradox pollutant
b. fugitive pollutant
c. uncontrolled pollutant
d. laps rate
Answer:
fugitive pollutant
QUESTION
A primary pollutant is
a. one that is formed in the atmosphere as a result of reactions such as hydrolysis, oxidation, and
photochemistry
b. one that is found in the atmosphere due to natural reactions
c. one that is found in the atmosphere in the same form as it exists
Answer:
one that is found in the atmosphere due to natural reactions
,QUESTION
How are total suspended particles measured?
a. flame photometry and weighing
b. gas filtration
c. flame ionization
d. collection and weighing
Answer:
collection and weighing
QUESTION
Which of the following inversions develop at night under conditions of relatively clear skies and
very light
winds?
a. subsidence inversion
b. frontal inversion
c. radiational inversion
d. stack emission inversion
Answer:
radiational inversion
QUESTION
The pitch of a sound is determined primarily by
a. frequency
b. wavelengths
c. sound pressure
d. all of the above
Answer:
frequency
QUESTION
The distance that a sound wave travels in on cycle of period is the
,a. sound intensity
b. wavelength of the sound
c. sound pressure
d. frequency
Answer:
wavelength of the sound
QUESTION
The speed with which sound travels through a particular medium is dependent on
a. the compressibility of the medium
b. the density of the medium
c. the compressibility and density of the medium
d. none of the above
Answer:
the density of the medium
QUESTION
A __________is a dimensionless unit to express physical intensity or sound pressure levels.
a. noise level
b. decibel
c. hertz
d. sound pressure level (SPL)
Answer:
decibel
QUESTION
If 10 decibels is 10 times more intense than one decibel, how many times more intense in 20
decibels than
one decibel?
a. 20
b. 30
c. 100
d. 1000
, Answer:
100
QUESTION
The first Federal standards for occupational exposure to noise were issued by
a. the Department of Transportation
b. the Federal Aviation Administration
c. the Department of Housing and Urban Development
d. the Department of Labor
Answer:
the Department of Labor
QUESTION
The shorter the wave length
a. the higher the frequency and lower the energy
b. the lower the frequency and energy
c. the lower the frequency and higher the energy
d. the higher the frequency and energy
Answer:
the higher the frequency and energy
QUESTION
The roentgen is a measure of the ionization in air produced by exposure to
a. x-rays or gamma rays
b. alpha particles
c. beta particles
d. all of the above
Answer:
x-rays or gamma rays
