IICRC OCT PRACTICE EXAM QUESTIONS AND
ANSWERS GRADED A+. 2025.
1. The is the technician's best instrument for detecting the presence
and intensity of an odor.: Nose
2. Odor is a gas interpreted by the .: Olfac-
tory lobe
3. The "pure" sensation of smell that is transmitted from the nose to the
olfactory lobe by way of the olfactory nerve is called .: real
odor
4. is a term used by some to de-
scribe odors which people believe they smell, based on experiences, sugges-
tions and past impressions.: Psychological odors
5. The human sense that is capable of distinguishing odors at very low con-
centrations is the .: Olfactory sense
6. An important property for a substance to have a detectable odor is
solubility.: water
7. is a condition where an individual becomes accus-
tomed to an odor.: Aclamation
8. Odor is most apparent when and
are high.: humidity ; temperature
9. Most deodorizations usually begin with the removal of the .-
: source
10. Cleaning the source area is the principle of odor
control.: 2nd
11. is the third general principle in effective de-
odorization.: Penetration
12. is the fourth principle of odor control.: Sealing
13. A is a compound that "locks-in" vaporous odor mol-
ecules.: sealer
14. Oxidizing agents break down organic matter by adding
.: oxygen
15. Chlorine bleach and ozone gas are .: oxidizers
16. Most deodorants used in smoke odor removal contain a combination of
and agents.: masking ; pairing
17. A combines with and changes a malodor-
ous substance to create a new odorless compound.: pairing agent
1/7
, 18. is a method of disguising a malodor with a stronger
more pleasant odor.: Masking
19. Oils, gels or solid materials impregnated with fragrances to mask odors
work on the - principle.: time-released
2/7
ANSWERS GRADED A+. 2025.
1. The is the technician's best instrument for detecting the presence
and intensity of an odor.: Nose
2. Odor is a gas interpreted by the .: Olfac-
tory lobe
3. The "pure" sensation of smell that is transmitted from the nose to the
olfactory lobe by way of the olfactory nerve is called .: real
odor
4. is a term used by some to de-
scribe odors which people believe they smell, based on experiences, sugges-
tions and past impressions.: Psychological odors
5. The human sense that is capable of distinguishing odors at very low con-
centrations is the .: Olfactory sense
6. An important property for a substance to have a detectable odor is
solubility.: water
7. is a condition where an individual becomes accus-
tomed to an odor.: Aclamation
8. Odor is most apparent when and
are high.: humidity ; temperature
9. Most deodorizations usually begin with the removal of the .-
: source
10. Cleaning the source area is the principle of odor
control.: 2nd
11. is the third general principle in effective de-
odorization.: Penetration
12. is the fourth principle of odor control.: Sealing
13. A is a compound that "locks-in" vaporous odor mol-
ecules.: sealer
14. Oxidizing agents break down organic matter by adding
.: oxygen
15. Chlorine bleach and ozone gas are .: oxidizers
16. Most deodorants used in smoke odor removal contain a combination of
and agents.: masking ; pairing
17. A combines with and changes a malodor-
ous substance to create a new odorless compound.: pairing agent
1/7
, 18. is a method of disguising a malodor with a stronger
more pleasant odor.: Masking
19. Oils, gels or solid materials impregnated with fragrances to mask odors
work on the - principle.: time-released
2/7
