CR- 21 Landscapes and Irrigation
AZROC Exam – Arizona Registrar of
Contractors (AZROC) Commercial
Landscaping and Irrigation –
2026/2027 Edition – Verified
Questions and Answers
What thickness in millimeters of pavers is used for residences?
A. .6
B. .5
C. .75
D. 63.5
D. 63.5
Brick (paving brick, pavers). Rectangular fired clay brick with typical dimensions of 4 inches x 8
inches x 2.5 inches thick. Available in a range of colors, paving bricks have no mortar holes and
an average strength of approximately 5,000 PSI.
,What is the length of a standard concrete block including the mortar joint?
A. 8 inches
B. 10 inches
C. 12 inches
D. 16 inches
D. 16 inches
Sizes are usually given in their nominal dimensions.A unit measuring 7 5/8" wide, 7 5/8" high,
and 15 5/8"long is known as an 8" x 8" x 16" unit. The mortar jointis intended to be 3/8" to fit
the modular design basedon a 4" module.
When should you seal the bottom of a piece of wood fencing?
A. If water pools under them
B. when within 5 feet of a sprinkler head
C. If there is less than 2 inches of clearance from the ground.
D. If it touches the earth
D. If it touches the earth
,If the boards have to touch the earth, seal the board ends before you install them.
How is transplant shock avoided?
A. NEED HELP WITH THIS CHOICE
B. Anti transpirants
C. increase water
D. Fertilize
B. Anti transpirants
Antitranspirants, also called antidesiccants, are chemicals that reduce the amount of water plants
lose through transpiration. Antitranspirants are useful because excessive water loss can result in
transplant shock. They normally act either to induce closing of the stomata or to cover the
stomata with a water-impermeable coating.
A trench has been prepared for a gray water irrigation lines, according to the International
Residential Code, what shall be the minimum depth of the filter material beneath the perforated
line?
A. 12 inches
B. 3 inches
, C. 8 inches
D. 6 inches
D. 6 inches
Not less than 6 inches in depth of aggregate, ranging in size from 1/2 to 2-1/2 inches (12.7 mm to
64 mm), shall be laid into the trench below the distribution piping elevation.
A CR-21 licensee may install residential misting systems under what PSI?
A. 1000 psi
B. 120 psi
C. 90 psi
D. 500 psi
A. 1000 psi
HARDSCAPING AND IRRIGATION SYSTEMS This classification allows the licensee to
install, alter, and repair:
Residential outdoor misting systems. Free standing or attached to existing appurtenance, not
more than 1000 PSI.
AZROC Exam – Arizona Registrar of
Contractors (AZROC) Commercial
Landscaping and Irrigation –
2026/2027 Edition – Verified
Questions and Answers
What thickness in millimeters of pavers is used for residences?
A. .6
B. .5
C. .75
D. 63.5
D. 63.5
Brick (paving brick, pavers). Rectangular fired clay brick with typical dimensions of 4 inches x 8
inches x 2.5 inches thick. Available in a range of colors, paving bricks have no mortar holes and
an average strength of approximately 5,000 PSI.
,What is the length of a standard concrete block including the mortar joint?
A. 8 inches
B. 10 inches
C. 12 inches
D. 16 inches
D. 16 inches
Sizes are usually given in their nominal dimensions.A unit measuring 7 5/8" wide, 7 5/8" high,
and 15 5/8"long is known as an 8" x 8" x 16" unit. The mortar jointis intended to be 3/8" to fit
the modular design basedon a 4" module.
When should you seal the bottom of a piece of wood fencing?
A. If water pools under them
B. when within 5 feet of a sprinkler head
C. If there is less than 2 inches of clearance from the ground.
D. If it touches the earth
D. If it touches the earth
,If the boards have to touch the earth, seal the board ends before you install them.
How is transplant shock avoided?
A. NEED HELP WITH THIS CHOICE
B. Anti transpirants
C. increase water
D. Fertilize
B. Anti transpirants
Antitranspirants, also called antidesiccants, are chemicals that reduce the amount of water plants
lose through transpiration. Antitranspirants are useful because excessive water loss can result in
transplant shock. They normally act either to induce closing of the stomata or to cover the
stomata with a water-impermeable coating.
A trench has been prepared for a gray water irrigation lines, according to the International
Residential Code, what shall be the minimum depth of the filter material beneath the perforated
line?
A. 12 inches
B. 3 inches
, C. 8 inches
D. 6 inches
D. 6 inches
Not less than 6 inches in depth of aggregate, ranging in size from 1/2 to 2-1/2 inches (12.7 mm to
64 mm), shall be laid into the trench below the distribution piping elevation.
A CR-21 licensee may install residential misting systems under what PSI?
A. 1000 psi
B. 120 psi
C. 90 psi
D. 500 psi
A. 1000 psi
HARDSCAPING AND IRRIGATION SYSTEMS This classification allows the licensee to
install, alter, and repair:
Residential outdoor misting systems. Free standing or attached to existing appurtenance, not
more than 1000 PSI.
