AZROC CR-21 LANDSCAPES AND IRRIGATION
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
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
CORRECT ANSWER
8 Inches
Question 2
What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer
CORRECT ANSWER
Thatch Layer
1
@THE STUDY VAULT
,Question 3
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
CORRECT ANSWER
4 inches of pea gravel
Question 4
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
CORRECT ANSWER
In rows, each row staggered
Question 5
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
2
@THE STUDY VAULT
,b) 6.3
c) 3.3
d) 4.3
CORRECT 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
Question 6
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
c) three times the width of the block
d) twice the width of the block
CORRECT ANSWER
Twice the width of the block
Question 7
How does a contractor know how to fill a trench to a certain grade?
a) by guessing
3
@THE STUDY VAULT
, b) the type of soil
c) by available backfill
d) the specifications
CORRECT ANSWER
The specifications
Question 8
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
CORRECT 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
Question 9
What is the maximum height above grade of a wooden deck that a CR-21 license may
build?
4
@THE STUDY VAULT
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
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
CORRECT ANSWER
8 Inches
Question 2
What is 1/2 inch of accumulated organic material in a grassy area called?
a) mulch
b) ground cover
c) stolons
d) thatch layer
CORRECT ANSWER
Thatch Layer
1
@THE STUDY VAULT
,Question 3
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
CORRECT ANSWER
4 inches of pea gravel
Question 4
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
CORRECT ANSWER
In rows, each row staggered
Question 5
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
2
@THE STUDY VAULT
,b) 6.3
c) 3.3
d) 4.3
CORRECT 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
Question 6
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
c) three times the width of the block
d) twice the width of the block
CORRECT ANSWER
Twice the width of the block
Question 7
How does a contractor know how to fill a trench to a certain grade?
a) by guessing
3
@THE STUDY VAULT
, b) the type of soil
c) by available backfill
d) the specifications
CORRECT ANSWER
The specifications
Question 8
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
CORRECT 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
Question 9
What is the maximum height above grade of a wooden deck that a CR-21 license may
build?
4
@THE STUDY VAULT
