CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
What is the minimum thickness of brick for the exterior wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - ans8 Inches
What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - ansThatch Layer
What should be provided as a cover for the drain tile before installing the pond liner where
subdrain is used?
a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - ans4 inches of pea gravel
How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - ansIn rows, each row staggered
You are going to pour a concrete pad that is 16 feet by 22 feet and 4 inches thick, how many
cubic yards of concrete are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - ans4.3 cubic yards
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
How wide should the footer be for a CMU wall?
a) equal to the width of the block
,CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
b) equal to the depth of the frostline
c) three times the width of the block
d) twice the width of the block - ansTwice the width of the block
How does a contractor know how to fill a trench to a certain grade?
a) by guessing
b) the type of soil
c) by available backfill
d) the specifications - ansThe specifications
How many 8inch x 8inchx16inch concrete masonry blocks will be required for a wall that is 8
feet 8 inches high and 104 feet long?
a) 936
b) 1088
c) 1124
d) 1014 - ans1014 blocks
8 feet * 12 inches = 96 inches + 8 inches = 104 inches
104 inches / 8 inches = 13 for height
104 feet * 12 inches = 1248 inches
1248 inches / 16 inches = 78 for length
13 * 78 = 1014 blocks
What is the maximum height above grade of a wooden deck that a CR-21 license may build?
a) 36 inches
b) 48 inches
c) 18 inches
d) 29 inches - ans29 inches
How do you choose a weir?
a) by the cost
b) without calculations, it is better to go with a bigger weir
c) without calculations, it is better to go with a smaller weir
d) by the material used - ansWithout calculations, it is better to go with a bigger weir
How high can a segmented wall be built?
a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet - ans4 feet
,CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
Which is the most common voltage requirement for the operation of a typical irrigation
system remote control valve?
a) 24 volt DC
b) 12 volt DC
c) 12 volt AC
d) 24 volt AC - ans24 volt AC
All of the following are reasons for pruning plants except to:
a) restricted size
b) rejuvenate growth
c) decrease fruit bearing capacity
d) improve flowering - ansDecrease fruit bearing capacity
What type of tree would make a good focal point and screen?
a) wide oval shaped
b) pyramidal
c) spreading
d) vase shaped - ansWide oval Shaped
What is necessary to supply power to the electrical source on a water fixture?
a) 12-3 wire
b) flexible conduit
c) 3 phase motor
d) schedule 40 conduit - ansSchedule 40 conduit
What fitting is used for changing directions with a pipe vertically or horizontally?
a) reducing 90 degree threaded elbow
b) 90 degree slip elbow
c) 90 degree threaded elbow
d) reducing 90 degree slip elbow - ans90 degree slip elbow
Which of the following should NEVER be done when transplanting a Balled and Burlapped
(B&B) evergreen?
a) loosen the burlap around the soil ball
b) water deeply when the hole is half full
c) dig the hole 100 percent larger than the soil ball
d) apply fertilizer to the soil during conditioning - ansApply fertilizer to the soil during
conditioning
What is the minimum distance that a portable heater should be placed away from a wall?
, CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
a) 24 inches
b) 12 inches
c) 18 inches
d) 36 inches - ans12 inches
What side of a cactus develops a thicker tougher skin due to sun exposure?
a) east side
b) west side
c) south side
d) north side - ansSouth side
If pouring concrete and the ground is frozen (or, when the temperature is freezing), what do
you do?
a) O.K to pour once the ground is wet
b) O.K if you cover with straw afterwards
c) is common practice during cold
d) absolutely no pour - ansAbsolutely no pour
Pavers should be laid?
a) after grading
b) after soil preparation
c) after soil preparation but before grading
d) before soil preparation and after grading - ansAfter soil preparation
What should be done with scrap wood with nails in it?
a) movie it out of the work area
b) grind the nails flush
c) collect in a labeled container
d) remove the nails before stacking or pulling it - ansRemove the nails before stacking or
piling it
What is the required slope of the ground immediately adjacent to a residential structure?
a) 1 in 12 for min of 12 feet
b) 6 inches for a min of 10 feet
c) 1 in 12 for a min of 6 feet
d) 2 in 12 for a min of 12 feet - ans6 inches for a minimum of 10 feet
What is the benefit of an as-built plan?
a) purchase leverage
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
What is the minimum thickness of brick for the exterior wall of a fireplace?
a) 6 inches
b) 8 inches
c) 10 inches
d) 9 inches - ans8 Inches
What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer - ansThatch Layer
What should be provided as a cover for the drain tile before installing the pond liner where
subdrain is used?
a) 4 inches of pea gravel
b) screen with 1/4 inch mesh
c) a pool grate
d) 8 inches of medium sized rock - ans4 inches of pea gravel
How do you properly plant ground cover?
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - ansIn rows, each row staggered
You are going to pour a concrete pad that is 16 feet by 22 feet and 4 inches thick, how many
cubic yards of concrete are needed?
a) 7.3
b) 6.3
c) 3.3
d) 4.3 - ans4.3 cubic yards
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16*22*0.333=117.3333
117.3333/27 = 4.3 cubic yards
How wide should the footer be for a CMU wall?
a) equal to the width of the block
,CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
b) equal to the depth of the frostline
c) three times the width of the block
d) twice the width of the block - ansTwice the width of the block
How does a contractor know how to fill a trench to a certain grade?
a) by guessing
b) the type of soil
c) by available backfill
d) the specifications - ansThe specifications
How many 8inch x 8inchx16inch concrete masonry blocks will be required for a wall that is 8
feet 8 inches high and 104 feet long?
a) 936
b) 1088
c) 1124
d) 1014 - ans1014 blocks
8 feet * 12 inches = 96 inches + 8 inches = 104 inches
104 inches / 8 inches = 13 for height
104 feet * 12 inches = 1248 inches
1248 inches / 16 inches = 78 for length
13 * 78 = 1014 blocks
What is the maximum height above grade of a wooden deck that a CR-21 license may build?
a) 36 inches
b) 48 inches
c) 18 inches
d) 29 inches - ans29 inches
How do you choose a weir?
a) by the cost
b) without calculations, it is better to go with a bigger weir
c) without calculations, it is better to go with a smaller weir
d) by the material used - ansWithout calculations, it is better to go with a bigger weir
How high can a segmented wall be built?
a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet - ans4 feet
,CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
Which is the most common voltage requirement for the operation of a typical irrigation
system remote control valve?
a) 24 volt DC
b) 12 volt DC
c) 12 volt AC
d) 24 volt AC - ans24 volt AC
All of the following are reasons for pruning plants except to:
a) restricted size
b) rejuvenate growth
c) decrease fruit bearing capacity
d) improve flowering - ansDecrease fruit bearing capacity
What type of tree would make a good focal point and screen?
a) wide oval shaped
b) pyramidal
c) spreading
d) vase shaped - ansWide oval Shaped
What is necessary to supply power to the electrical source on a water fixture?
a) 12-3 wire
b) flexible conduit
c) 3 phase motor
d) schedule 40 conduit - ansSchedule 40 conduit
What fitting is used for changing directions with a pipe vertically or horizontally?
a) reducing 90 degree threaded elbow
b) 90 degree slip elbow
c) 90 degree threaded elbow
d) reducing 90 degree slip elbow - ans90 degree slip elbow
Which of the following should NEVER be done when transplanting a Balled and Burlapped
(B&B) evergreen?
a) loosen the burlap around the soil ball
b) water deeply when the hole is half full
c) dig the hole 100 percent larger than the soil ball
d) apply fertilizer to the soil during conditioning - ansApply fertilizer to the soil during
conditioning
What is the minimum distance that a portable heater should be placed away from a wall?
, CR-21 Landscapes and Irrigation
AZROC Exam Study Guide with
100% Correct Answers.
Latest Updated Guide 2026/2027.
a) 24 inches
b) 12 inches
c) 18 inches
d) 36 inches - ans12 inches
What side of a cactus develops a thicker tougher skin due to sun exposure?
a) east side
b) west side
c) south side
d) north side - ansSouth side
If pouring concrete and the ground is frozen (or, when the temperature is freezing), what do
you do?
a) O.K to pour once the ground is wet
b) O.K if you cover with straw afterwards
c) is common practice during cold
d) absolutely no pour - ansAbsolutely no pour
Pavers should be laid?
a) after grading
b) after soil preparation
c) after soil preparation but before grading
d) before soil preparation and after grading - ansAfter soil preparation
What should be done with scrap wood with nails in it?
a) movie it out of the work area
b) grind the nails flush
c) collect in a labeled container
d) remove the nails before stacking or pulling it - ansRemove the nails before stacking or
piling it
What is the required slope of the ground immediately adjacent to a residential structure?
a) 1 in 12 for min of 12 feet
b) 6 inches for a min of 10 feet
c) 1 in 12 for a min of 6 feet
d) 2 in 12 for a min of 12 feet - ans6 inches for a minimum of 10 feet
What is the benefit of an as-built plan?
a) purchase leverage
