CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
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 - ANSWER---8 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 - ANSWER---Thatch 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 - ANSWER---4 inches of pea gravel
How do you properly plant ground cover?
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - ANSWER---In 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 - ANSWER---4.3 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
b) equal to the depth of the frostline
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
c) three times the width of the block
d) twice the width of the block - ANSWER---Twice 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 - ANSWER---The 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 - ANSWER---1014 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
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
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 - ANSWER---29 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 - ANSWER---Without 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 - ANSWER---4 feet
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
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 - ANSWER---8 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 - ANSWER---Thatch 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 - ANSWER---4 inches of pea gravel
How do you properly plant ground cover?
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
a) in a circular pattern
b) in rows, each row staggered
c) in groups of 2
d) 18 inches apart in rows - ANSWER---In 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 - ANSWER---4.3 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
b) equal to the depth of the frostline
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
c) three times the width of the block
d) twice the width of the block - ANSWER---Twice 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 - ANSWER---The 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 - ANSWER---1014 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
, CR – 21 LANDSCAPES AND IRRIGATION AZROC TEST
PREP EXAM (ACTUAL EXAM) WITH CORRECT
QUESTIONS AND WELL ANSWERED LATEST GRADED A+
2025 – 2026
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 - ANSWER---29 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 - ANSWER---Without 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 - ANSWER---4 feet
