NICET Construction Materials Testing – Soils Level II practice exam Questions
and Correct Answers (Verified Answers) Plus Rationales
Domain 1: Compaction & Moisture-Density Relationships (Proctor Tests) (Q1–25)
1. The primary purpose of performing a Proctor compaction test is to determine:
A) Soil shear strength
B) Soil permeability
C) Maximum dry density and optimum moisture content
D) Soil classification
Answer: C
Rationale: The Proctor test establishes the moisture–density relationship, which is
used as a reference for field compaction specifications .
2. Which ASTM standard covers the Standard Proctor compaction test?
,A) ASTM D4318
B) ASTM D698
C) ASTM D1557
D) ASTM D2166
Answer: B
Rationale: ASTM D698 specifies the standard (light energy) Proctor compaction
procedure. ASTM D1557 covers Modified Proctor .
3. The Modified Proctor test differs from the Standard Proctor primarily by:
A) Smaller mold size
B) Lower moisture content
C) Higher compactive effort
D) Finer soil gradation
Answer: C
Rationale: Modified Proctor uses a heavier hammer (10 lbs vs. 5.5 lbs), greater
drop height (18 inches vs. 12 inches), and more blows, simulating heavier field
compaction equipment .
,4. The standard hammer weight for the Standard Proctor test is:
A) 5.5 lbs with a 12-inch drop
B) 10 lbs with an 18-inch drop
C) 5.5 lbs with an 18-inch drop
D) 10 lbs with a 12-inch drop
Answer: A
Rationale: Standard Proctor uses a 5.5 lb hammer dropped from 12 inches.
Modified Proctor uses a 10 lb hammer dropped from 18 inches .
5. In the Standard Proctor test using a 4-inch mold, how many layers and blows
per layer are required?
A) 3 layers, 25 blows per layer
B) 5 layers, 25 blows per layer
C) 3 layers, 56 blows per layer
D) 5 layers, 56 blows per layer
Answer: A
Rationale: A 4-inch Proctor mold requires 3 lifts with 25 blows per lift. A 6-inch
mold requires 5 lifts with 56 blows per lift .
, 6. The Modified Proctor test uses a 10 lb hammer dropped from:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B
Rationale: Modified Proctor compactive effort is achieved with a 10 lb hammer
dropped 18 inches .
7. Which Proctor method should be used when the material passes the 3/4-inch
sieve?
A) Method A only
B) Method C
C) Method B only
D) Methods C and D
Answer: D
and Correct Answers (Verified Answers) Plus Rationales
Domain 1: Compaction & Moisture-Density Relationships (Proctor Tests) (Q1–25)
1. The primary purpose of performing a Proctor compaction test is to determine:
A) Soil shear strength
B) Soil permeability
C) Maximum dry density and optimum moisture content
D) Soil classification
Answer: C
Rationale: The Proctor test establishes the moisture–density relationship, which is
used as a reference for field compaction specifications .
2. Which ASTM standard covers the Standard Proctor compaction test?
,A) ASTM D4318
B) ASTM D698
C) ASTM D1557
D) ASTM D2166
Answer: B
Rationale: ASTM D698 specifies the standard (light energy) Proctor compaction
procedure. ASTM D1557 covers Modified Proctor .
3. The Modified Proctor test differs from the Standard Proctor primarily by:
A) Smaller mold size
B) Lower moisture content
C) Higher compactive effort
D) Finer soil gradation
Answer: C
Rationale: Modified Proctor uses a heavier hammer (10 lbs vs. 5.5 lbs), greater
drop height (18 inches vs. 12 inches), and more blows, simulating heavier field
compaction equipment .
,4. The standard hammer weight for the Standard Proctor test is:
A) 5.5 lbs with a 12-inch drop
B) 10 lbs with an 18-inch drop
C) 5.5 lbs with an 18-inch drop
D) 10 lbs with a 12-inch drop
Answer: A
Rationale: Standard Proctor uses a 5.5 lb hammer dropped from 12 inches.
Modified Proctor uses a 10 lb hammer dropped from 18 inches .
5. In the Standard Proctor test using a 4-inch mold, how many layers and blows
per layer are required?
A) 3 layers, 25 blows per layer
B) 5 layers, 25 blows per layer
C) 3 layers, 56 blows per layer
D) 5 layers, 56 blows per layer
Answer: A
Rationale: A 4-inch Proctor mold requires 3 lifts with 25 blows per lift. A 6-inch
mold requires 5 lifts with 56 blows per lift .
, 6. The Modified Proctor test uses a 10 lb hammer dropped from:
A) 12 inches
B) 18 inches
C) 24 inches
D) 30 inches
Answer: B
Rationale: Modified Proctor compactive effort is achieved with a 10 lb hammer
dropped 18 inches .
7. Which Proctor method should be used when the material passes the 3/4-inch
sieve?
A) Method A only
B) Method C
C) Method B only
D) Methods C and D
Answer: D
