NEHA REHS/RS EXAM FULL QUESTIONS AND
CORRECT ANSWERS UPDATED 2026 FINAL
PAPER
⫸ Question 4
Marks: 1
Fluorocarbons in the atmosphere are of concern because they may
Choose one answer.
a. react with the ozone in the upper atmosphere, thus reducing the
total amount of ozone available
b. cause an increase in ultraviolet radiation reaching the earth
c. cause an increase in skin cancers and changes in our climate,
animal, and plant life
d. all of the above. Answer: all of the above
⫸ Question 5
Marks: 1
The terms "washout" and "rainout" both refer to a cleansing process
of pollutants in the atmosphere.
Choose one answer.
,a. True
b. False. Answer: True
⫸ Question 6
Marks: 1
A ______ is a dimensionless unit to express physical intensity or
sound pressure levels.
Choose one answer.
a. noise level
b. decibel
c. hertz
d. sound pressure level (SPL). Answer: decibel
⫸ Question 7
Marks: 1
The frequency of a sound determines its pitch.
Choose one answer.
,a. True
b. False. Answer: True
⫸ Question 8
Marks: 1
When two pollutants are combined, the effects are greater than the
sum of the individual effects. This is called
Choose one answer.
a. commensalism
b. synergism
c. magnification
d. multiplication. Answer: synergism
⫸ Question 9
Marks: 1
Scrubbers are wet collectors generally used to remove particles that
form as a
Choose one answer.
, a. nonsoluable vapor
b. mist, solid, or vapor
c. fog, mist, or dust
d. fume, dust, or mist. Answer: fog, mist, or dust
⫸ Question 10
Marks: 1
Precipitation accomplishes an effective cleansing process of
pollutants in the atmosphere by
Choose one answer.
a. accumulation of small particles in the formation of raindrops or
snowflakes in clouds
b. the washing out of scavenging of large particles by falling
raindrops or snowflakes
c. removal of gaseous pollutants by dissolution and absorption
d. all of the above. Answer: all of the above
CORRECT ANSWERS UPDATED 2026 FINAL
PAPER
⫸ Question 4
Marks: 1
Fluorocarbons in the atmosphere are of concern because they may
Choose one answer.
a. react with the ozone in the upper atmosphere, thus reducing the
total amount of ozone available
b. cause an increase in ultraviolet radiation reaching the earth
c. cause an increase in skin cancers and changes in our climate,
animal, and plant life
d. all of the above. Answer: all of the above
⫸ Question 5
Marks: 1
The terms "washout" and "rainout" both refer to a cleansing process
of pollutants in the atmosphere.
Choose one answer.
,a. True
b. False. Answer: True
⫸ Question 6
Marks: 1
A ______ is a dimensionless unit to express physical intensity or
sound pressure levels.
Choose one answer.
a. noise level
b. decibel
c. hertz
d. sound pressure level (SPL). Answer: decibel
⫸ Question 7
Marks: 1
The frequency of a sound determines its pitch.
Choose one answer.
,a. True
b. False. Answer: True
⫸ Question 8
Marks: 1
When two pollutants are combined, the effects are greater than the
sum of the individual effects. This is called
Choose one answer.
a. commensalism
b. synergism
c. magnification
d. multiplication. Answer: synergism
⫸ Question 9
Marks: 1
Scrubbers are wet collectors generally used to remove particles that
form as a
Choose one answer.
, a. nonsoluable vapor
b. mist, solid, or vapor
c. fog, mist, or dust
d. fume, dust, or mist. Answer: fog, mist, or dust
⫸ Question 10
Marks: 1
Precipitation accomplishes an effective cleansing process of
pollutants in the atmosphere by
Choose one answer.
a. accumulation of small particles in the formation of raindrops or
snowflakes in clouds
b. the washing out of scavenging of large particles by falling
raindrops or snowflakes
c. removal of gaseous pollutants by dissolution and absorption
d. all of the above. Answer: all of the above
