CR-21 LANDSCAPES AND
IRRIGATION AZROC TEST PREP
EXAM, QUESTIONS WITH
ACCURATE ANSWERS | MULTIPLE
CHOICES |2025\2026!!
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 ANS -8 Inches
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 ANS -Thatch Layer
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 ANS -4 inches of pea gravel
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 ANS -In rows, each row staggered
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?
1
, a) 7.3
b) 6.3
c) 3.3
d) 4.3 - CORRECT ANS -4.3 cubic yards
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 ANS -Twice the width of the
block
7. 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 - CORRECT ANS -The specifications
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 ANS -1014 blocks
9. 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 - CORRECT ANS -29 inches
10. 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 - CORRECT ANS -Without calculations, it is better to
go with a bigger weir
11. How high can a segmented wall be built?
2
, a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet - CORRECT ANS -4 feet
12. 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 - CORRECT ANS -24 volt AC
13. 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 - CORRECT ANS -Decrease fruit bearing capacity
14. What type of tree would make a good focal point and screen?
a) wide oval shaped
b) pyramidal
c) spreading
d) vase shaped - CORRECT ANS -Wide oval Shaped
15. 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 - CORRECT ANS -Schedule 40 conduit
16. 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 - CORRECT ANS -90 degree slip elbow
17. 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
3
, 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 - CORRECT ANS -Apply
fertilizer to the soil during conditioning
18. 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 - CORRECT ANS -12 inches
19. 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 - CORRECT ANS -South side
20. 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 - CORRECT ANS -Absolutely no pour
21. 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 - CORRECT ANS -After soil
preparation
22. 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 - CORRECT ANS -Remove
the nails before stacking or piling it
23. What is the required slope of the ground immediately adjacent to a residential
structure?
4
IRRIGATION AZROC TEST PREP
EXAM, QUESTIONS WITH
ACCURATE ANSWERS | MULTIPLE
CHOICES |2025\2026!!
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 ANS -8 Inches
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 ANS -Thatch Layer
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 ANS -4 inches of pea gravel
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 ANS -In rows, each row staggered
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?
1
, a) 7.3
b) 6.3
c) 3.3
d) 4.3 - CORRECT ANS -4.3 cubic yards
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 ANS -Twice the width of the
block
7. 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 - CORRECT ANS -The specifications
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 ANS -1014 blocks
9. 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 - CORRECT ANS -29 inches
10. 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 - CORRECT ANS -Without calculations, it is better to
go with a bigger weir
11. How high can a segmented wall be built?
2
, a) 3 feet
b) 6 feet
c) 9 feet
d) 4 feet - CORRECT ANS -4 feet
12. 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 - CORRECT ANS -24 volt AC
13. 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 - CORRECT ANS -Decrease fruit bearing capacity
14. What type of tree would make a good focal point and screen?
a) wide oval shaped
b) pyramidal
c) spreading
d) vase shaped - CORRECT ANS -Wide oval Shaped
15. 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 - CORRECT ANS -Schedule 40 conduit
16. 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 - CORRECT ANS -90 degree slip elbow
17. 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
3
, 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 - CORRECT ANS -Apply
fertilizer to the soil during conditioning
18. 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 - CORRECT ANS -12 inches
19. 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 - CORRECT ANS -South side
20. 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 - CORRECT ANS -Absolutely no pour
21. 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 - CORRECT ANS -After soil
preparation
22. 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 - CORRECT ANS -Remove
the nails before stacking or piling it
23. What is the required slope of the ground immediately adjacent to a residential
structure?
4
