Page 1 of 288
ISA ARBORIST CERTIFICATION EXAM BANK |
{LATEST 2026/ 2027 UPDATE} COMPLETE
ACTUAL AND AUTHENTIC EXAM | BRAND NEW!
For an ideal soil ratio, what component takes up the least
amount of space within the overall
makeup of the soil structure?
(A) Water
(B) Air
(C) Organic matter
(D) Mineral rich soil
Ideal soil is 50 percent solids and 50 percent pore space. Within
the pore space is water and air
and the solids are composed of mineral rich soil and organic
matter. The organic matter is the
smallest percentage of the overall make up.
The answer is (C)
,Page 2 of 288
What is not a correct requirement for chainsaw safety?
(A) Fuel the saw at least 10 feet from ignition sources
(B) The fuel container shall be either metal or plastic
(C) The fuel container shall be at least 10 gallons
(D) The engine is an appropriate size for the job
Chainsaw safety requirements include:
· Metal or plastic fuel container
· Fueling at least 10 feet away from any ignition source
· Is approved by the appropriate entities
· Fuel tank is no greater than 5 gallons
The answer is (C)
What soil horizon category is most likely to include a large
amount of organic material?
(A) A
(B) E
(C) B
(D) C
Organic material decomposes near the top of the soil structure
and is responsible for facilitating
,Page 3 of 288
a biologically active area. The O layer is mostly organic which is
followed by the A, a layer
composed of both organic and inorganic material. Once the E
layer is reached a noticeable lack
of organic material is present.
The answer is (A)
What soil below most likely has the highest infiltration rate?
(A) Loose sand
(B) Compacted silt
(C) Loose silt
(D) Compacted clay
The infiltration rate is a measure of how quickly water drains
through soil. This is determined by
the pore space which is a function of the size of the soil particles
and the level of compaction. A
soil with larger particles such as sand will have larger pore
spaces and allow water to drain
more freely. This is the opposite with clay that has fine particles.
Also, the higher the level of
, Page 4 of 288
compaction, the smaller the pore space and therefore the lower
the infiltration rate. The
combination of the large particles and low compaction would
indicate loose sand as having a
high infiltration rate
The answer is (A)
What substance may be added to soil to temporarily lower the
PH?
(A) Lime
(B) Ash
(C) Sulfur
(D) Calcium
Substances may be used to adjust the PH of soil if it is not at an
appropriate level. Lime is
commonly used to raise the PH whereas sulfur is used to lower
it.
The answer is (C)
ISA ARBORIST CERTIFICATION EXAM BANK |
{LATEST 2026/ 2027 UPDATE} COMPLETE
ACTUAL AND AUTHENTIC EXAM | BRAND NEW!
For an ideal soil ratio, what component takes up the least
amount of space within the overall
makeup of the soil structure?
(A) Water
(B) Air
(C) Organic matter
(D) Mineral rich soil
Ideal soil is 50 percent solids and 50 percent pore space. Within
the pore space is water and air
and the solids are composed of mineral rich soil and organic
matter. The organic matter is the
smallest percentage of the overall make up.
The answer is (C)
,Page 2 of 288
What is not a correct requirement for chainsaw safety?
(A) Fuel the saw at least 10 feet from ignition sources
(B) The fuel container shall be either metal or plastic
(C) The fuel container shall be at least 10 gallons
(D) The engine is an appropriate size for the job
Chainsaw safety requirements include:
· Metal or plastic fuel container
· Fueling at least 10 feet away from any ignition source
· Is approved by the appropriate entities
· Fuel tank is no greater than 5 gallons
The answer is (C)
What soil horizon category is most likely to include a large
amount of organic material?
(A) A
(B) E
(C) B
(D) C
Organic material decomposes near the top of the soil structure
and is responsible for facilitating
,Page 3 of 288
a biologically active area. The O layer is mostly organic which is
followed by the A, a layer
composed of both organic and inorganic material. Once the E
layer is reached a noticeable lack
of organic material is present.
The answer is (A)
What soil below most likely has the highest infiltration rate?
(A) Loose sand
(B) Compacted silt
(C) Loose silt
(D) Compacted clay
The infiltration rate is a measure of how quickly water drains
through soil. This is determined by
the pore space which is a function of the size of the soil particles
and the level of compaction. A
soil with larger particles such as sand will have larger pore
spaces and allow water to drain
more freely. This is the opposite with clay that has fine particles.
Also, the higher the level of
, Page 4 of 288
compaction, the smaller the pore space and therefore the lower
the infiltration rate. The
combination of the large particles and low compaction would
indicate loose sand as having a
high infiltration rate
The answer is (A)
What substance may be added to soil to temporarily lower the
PH?
(A) Lime
(B) Ash
(C) Sulfur
(D) Calcium
Substances may be used to adjust the PH of soil if it is not at an
appropriate level. Lime is
commonly used to raise the PH whereas sulfur is used to lower
it.
The answer is (C)
