CR-21 HARDSCAPING AND IRRIGATION
SYSTEMS EXAM WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS|FREQUENTLY TESTED
QUESTIONS AND SOLUTIPONS |AND
ALREADY GRADED
A+|NEWEST|GUARANTEED PASS 2026|2027
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
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
4.3 cubic yards
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16220.333=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
c) three times the width of the block
d) twice the width of the block
Twice the width of the block
1|Page
,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
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
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
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
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
Without calculations, it is better to go with a bigger weir
2|Page
,How high can a segmented wall be built?
a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet
4 feet
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
24 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
Decrease 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
Wide oval Shaped
What is necessary to supply power to the electrical source on a water fixture?
a) 12-3 wire
b) flexible conduit
3|Page
, c) 3 phase motor
d) schedule 40 conduit
Schedule 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
90 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
Apply fertilizer to the soil during conditioning
What is the minimum distance that a portable heater should be placed away from a wall?
a) 24 inches
b) 12 inches
c) 18 inches
d) 36 inches
12 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
4|Page
SYSTEMS EXAM WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS|FREQUENTLY TESTED
QUESTIONS AND SOLUTIPONS |AND
ALREADY GRADED
A+|NEWEST|GUARANTEED PASS 2026|2027
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
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
4.3 cubic yards
4.3 cubic yards
4inches ---> 0.333ft
Cubic feet to cubic yards /27
16220.333=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
c) three times the width of the block
d) twice the width of the block
Twice the width of the block
1|Page
,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
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
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
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
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
Without calculations, it is better to go with a bigger weir
2|Page
,How high can a segmented wall be built?
a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet
4 feet
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
24 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
Decrease 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
Wide oval Shaped
What is necessary to supply power to the electrical source on a water fixture?
a) 12-3 wire
b) flexible conduit
3|Page
, c) 3 phase motor
d) schedule 40 conduit
Schedule 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
90 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
Apply fertilizer to the soil during conditioning
What is the minimum distance that a portable heater should be placed away from a wall?
a) 24 inches
b) 12 inches
c) 18 inches
d) 36 inches
12 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
4|Page
