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Key Facts: Iran Nezam Civil Supervision Exam Exam

60 Questions

Total Questions

INBR / MRUD

150 minutes

Time Limit

INBR

50 / 100

Passing Threshold (clause 6-4, 1405 instruction)

INBR

3 wrong = 1 right

Negative Marking Rule

INBR

Open-Book

Exam Delivery Mode

INBR

Grade 3

Initial License Grade Awarded

IRCEO

The Iran Nezam Civil Supervision examination is a 150-minute open-book paper of 60 four-option multiple-choice questions, held nationwide under the Office of National Building Regulations. It tests supervisory procedures, concrete inspection, structural steel erection, geotechnical shoring, and Standard 2800 seismic detailing. Negative marking applies and the pass threshold is 50 out of 100. The official paper is in Persian; OpenExamPrep provides independent English-language practice questions for the same topics.

Sample Iran Nezam Civil Supervision Exam Practice Questions

Try these sample questions to review concepts for the Iran Nezam Civil Supervision Exam exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1During pre-pour inspection of a reinforced concrete mat foundation cast directly against blinding (lean concrete / beton-e magar) over soil, what is the mandatory minimum clear concrete cover to the bottom rebar under INBR Topic 9?
A.40 mm
B.50 mm
C.75 mm
D.100 mm
Explanation: Under INBR Topic 9 (Section on concrete durability and clear cover), the minimum concrete cover for foundation elements cast against a prepared lean concrete bed (beton-e magar) is 50 mm. If concrete were cast directly against unformed earth without any lean concrete layer, the mandatory minimum cover would be 75 mm.
2When inspecting the longitudinal reinforcement in a primary cast-in-place concrete girder, the supervising engineer measures the horizontal clear distance between adjacent parallel longitudinal bars (diameter db = 25 mm). What is the minimum clear spacing required by INBR Topic 9 assuming a maximum coarse aggregate size of 20 mm?
A.25 mm
B.27 mm
C.35 mm
D.40 mm
Explanation: According to INBR Topic 9, the minimum clear horizontal distance between parallel longitudinal bars in beams must not be less than db (25 mm), 25 mm, and 1.33 times the maximum nominal aggregate size (1.33 * 20 mm = 26.6 mm ~ 27 mm). Therefore, the controlling minimum clear spacing is 27 mm.
3On a construction site, an executing contractor proposes to lap splice 100% of the longitudinal tension reinforcement bars at the exact same critical cross-section in a flexural beam. How must the supervising civil engineer rule under INBR Topic 9?
A.Approve the splice provided a Class A lap splice length is maintained
B.Reject the proposal because lap splices in tension members must be staggered and cannot lap 100% of bars at a single section in critical zones
C.Approve the proposal only if the contractor increases the concrete compressive strength by 5 MPa
D.Approve the splice provided stirrups within the lap zone are completely omitted to prevent congestion
Explanation: Under INBR Topic 9, tension lap splices must be staggered; lapping 100% of tension bars at a single cross-section in critical tension zones is prohibited. Splicing more than 50% of bars at one section requires a Class B lap (1.3 times the development length ld) and is restricted to non-critical moment locations.
4In a building designed with special moment frames (Dab-e Khass) under Standard 2800 and INBR Topic 9, where are lap splices of column longitudinal bars strictly prohibited?
A.Within the middle third of the clear column height
B.Within the critical end confinement zones (plastic hinge regions) and inside beam-column joint cores
C.Anywhere along the entire height of intermediate stories
D.On all bars having a diameter smaller than 20 mm
Explanation: Under INBR Topic 9 and Standard 2800, lap splices in column longitudinal reinforcement of special moment frames must be located within the middle half of the member height and are strictly prohibited within the critical plastic hinge regions (length L0 at column ends) and within beam-column joints.
5When mechanical rebar splices (couplers) are used for longitudinal column bars in a special moment-resisting concrete frame, what tensile performance criterion must the mechanical splice satisfy under INBR Topic 9 (Type 2 mechanical splice)?
A.At least 100% of the specified yield strength (fy) of the bar
B.At least 125% of the specified yield strength (fy) and develop the specified tensile strength (fu) of the bar
C.Exactly 110% of the nominal bar yield strength
D.Couplers are completely prohibited in special moment-resisting concrete frames under Topic 9
Explanation: Under INBR Topic 9, mechanical splices used in seismic framing must qualify as Type 2 splices if placed in critical locations. Type 2 mechanical splices must be capable of developing at least 1.25 times the specified yield strength (fy) of the bar as well as the specified ultimate tensile strength (fu) of the spliced rebar.
6A ready-mix concrete truck arrives at the site on a warm day (ambient temperature 28°C). According to INBR Topic 9, what is the maximum permissible time from initial batching (water contact with cement) to complete discharge without retarding admixtures?
A.45 minutes
B.90 minutes
C.120 minutes
D.150 minutes
Explanation: Under INBR Topic 9 and standard Iranian ready-mix concrete specifications, the maximum elapsed time between the introduction of mixing water to the dry ingredients and the completion of concrete discharge from the truck mixer must not exceed 90 minutes (or 300 drum revolutions), whichever comes first, unless an approved retarding admixture is used.
7A structural concrete mix has a specified design slump of 80 mm. When the supervising engineer performs a site slump test on a sampled truckload under INBR Topic 9, what is the allowable slump tolerance range?
A.±10 mm
B.±25 mm
C.±40 mm
D.±50 mm
Explanation: Under INBR Topic 9 and ASTM C143/ISIRI standards, for a specified slump between 50 mm and 100 mm (inclusive), the permissible acceptance tolerance on the measured site slump is ±25 mm. A slump reading between 55 mm and 105 mm is therefore acceptable.
8During concrete pouring for an intermediate floor slab, the pump operator claims the mix is too stiff and instructs the truck driver to add 50 liters of tap water into the mixer drum. What is the immediate professional duty of the supervising civil engineer?
A.Permit the water addition provided the drum is mixed for at least 30 revolutions
B.Order the immediate rejection and removal of the entire truckload from the jobsite
C.Allow the pour to proceed but instruct the contractor to cure the slab for 14 extra days
D.Allow the water addition only if the contractor signs an informal handwritten waiver
Explanation: Under INBR Topic 9, unauthorized addition of water at the jobsite after batching is strictly forbidden as it arbitrarily increases the water-cement ratio, drastically reducing compressive strength, durability, and increasing shrinkage cracking. The supervising engineer must immediately reject the adulterated truckload, record the incident in the site log, and prohibit its placement.
9To prevent aggregate segregation during placement in tall vertical forms (such as RC columns and shear walls), what is the maximum unrestricted free-fall height for fresh concrete permitted under INBR Topic 9?
A.0.8 meters
B.1.2 meters
C.2.5 meters
D.3.5 meters
Explanation: Under INBR Topic 9, the free vertical drop of fresh concrete during placement must not exceed 1.2 meters (unless using tremie pipes, drop chutes, or elephant trunks) to prevent coarse aggregate separation from the cement paste, which causes severe basal honeycombing and voiding.
10When inspecting internal mechanical consolidation (vibration) of a newly placed concrete slab-column joint, which of the following practices observed by the supervising engineer represents a code violation under INBR Topic 9?
A.Inserting the vibrator head vertically into the layer at uniform spacing of 1.5 times the radius of action
B.Penetrating the vibrator head 100 mm into the previously placed underlying layer
C.Using the vibrator head horizontally to push and transport fresh concrete across the formwork
D.Withdrawing the vibrator head slowly at a rate of approximately 50 to 75 mm per second
Explanation: Using an internal vibrator to move or drag concrete horizontally is strictly forbidden under INBR Topic 9 because it drives the mortar forward while leaving coarse aggregate behind, causing severe segregation, surface honeycombing, and weakening of the structure.

About the Iran Nezam Civil Supervision Exam Exam

The Iran Nezam Civil Supervision exam is the official licensure assessment administered by the Ministry of Roads and Urban Development for civil engineers seeking the supervision (Nezarat) practicing grade in the Construction Engineering Organization of Iran. Supervising civil engineers oversee structural execution, excavation safety, reinforced concrete framing, steel erection, and seismic detailing to ensure strict compliance with approved structural drawings and National Building Regulations.

Exam sponsor: Office of National Building Regulations and Building Control (inbr.ir), Ministry of Roads and Urban Development; delivered nationwide by the National Organization for Educational Testing (Sazman-e Sanjesh) educational services company. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

60 four-option multiple-choice questions covering supervisory procedures (Topic 2), concrete supervision (Topic 9), steel supervision (Topic 10), geotechnical/foundation supervision (Topic 7), and seismic detailing (Standard 2800)

Time Limit

150 minutes

Passing Score

50 out of 100 (50%) — clause 6-4 of the official 1405 registration instruction, calculated after the negative-marking deduction

Exam / Certification Fees

Set per sitting and shown in the inbr.ir registration cart; the official 1405 registration instruction does not publish a fixed amount

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

25%

Concrete Structure Supervision (INBR Topic 9)

Inspection of reinforcement cages, clear rebar cover, formwork alignment and bracing, concrete mix delivery tickets, fresh concrete sampling, slump testing, compressive strength acceptance, NDT methods, and remedial repairs

20%

Steel Structure Supervision (INBR Topic 10)

Material mill certificates, steel grades, weld visual inspection and NDT (penetrant, magnetic, ultrasonic, radiographic), preloaded high-strength bolts, base plate leveling and grouting, and erection column plumbness

20%

Supervisory Procedures & Legal Liabilities (INBR Topic 2 & Law)

Statutory responsibilities of the supervising engineer, civil and disciplinary liabilities, mandatory stage inspection reporting, stop-work notice protocols, municipal enforcement, and coordinating supervisor roles

20%

Geotechnical & Foundation Supervision (INBR Topic 7)

Verification of geotechnical boreholes and soil reports, safety of deep excavations, shoring systems (soldier beams, struts, anchoring, nailing), adjacent structure settlement monitoring, lean concrete, and foundation waterproofing

15%

Seismic Detailing & Building Safety (Standard 2800 & Topic 12)

Seismic separation joints (darz-e enqeta), confinement reinforcement at critical beam-column plastic hinge regions, 135-degree seismic hooks, masonry infill isolation and wall-post (walpost) detailing, and jobsite safety

Preparing for the Iran Nezam Civil Supervision Exam Exam

What You Need to Know

  • Passing score: 50 out of 100 (50%) — clause 6-4 of the official 1405 registration instruction, calculated after the negative-marking deduction
  • Assessment: 60 four-option multiple-choice questions covering supervisory procedures (Topic 2), concrete supervision (Topic 9), steel supervision (Topic 10), geotechnical/foundation supervision (Topic 7), and seismic detailing (Standard 2800)
  • Time limit: 150 minutes
  • Exam / certification fees: Set per sitting and shown in the inbr.ir registration cart; the official 1405 registration instruction does not publish a fixed amount Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Iran Nezam Civil Supervision Exam: Suggested Study Strategy

1Thoroughly index the tables and inspection chapters of INBR Topics 7, 9, 10, and Standard 2800 for rapid page lookup during the 150-minute exam
2Master the concrete sampling and acceptance criteria in Topic 9, including cube-to-cylinder conversion formulas and the 3-consecutive test average rule
3Understand the statutory administrative reporting timeline under Topic 2, including the exact stage reports and coordinating supervisor obligations
4Carefully study weld defect tolerances and NDT inspection regimes under INBR Topic 10 and AWS D1.1 structural welding requirements
5Manage negative marking strictly by leaving questions completely blank when uncertain rather than taking speculative gambles

Frequently Asked Questions

What is the format of the Iran Nezam Civil Supervision exam?

The examination consists of 60 four-option multiple-choice questions administered over 150 minutes. Under clause 6-2 of the official 1405 registration instruction, it is conducted open book (ketab-baz), permitting candidates to bring approved Iranian National Building Regulations (Mabahes) volumes and personal reference notes. Negative marking is enforced: each incorrect response deducts 1/3 of a point, meaning three wrong answers cancel out one correct answer.

What is the passing score for the Civil Supervision exam?

According to clause 6-4 of the official registration instruction, candidates must achieve a net score of at least 50% (50 points out of 100). Because negative marking deducts points for wrong answers, guessing blindly can pull a passing candidate below the threshold. A passing score is valid for up to 3 years toward obtaining the Grade 3 (Payeh 3) practicing license.

Which National Building Regulations (Mabahes) are tested on the Civil Supervision paper?

The primary syllabus comprises INBR Topic 2 (Administrative Systems & Supervision), Topic 7 (Geotechnics and Foundation Engineering), Topic 9 (Design and Execution of Reinforced Concrete Structures), Topic 10 (Design and Execution of Steel Structures), Iranian Code of Practice for Seismic Resistant Design of Buildings (Standard 2800, 4th edition), Topic 12 (Safety and Health During Construction), Topic 5 (Building Materials), Topic 11 (Industrialized Building), and Topic 22 (Building Maintenance).

What is the legal duty of a supervising civil engineer if a critical structural violation occurs?

Under INBR Topic 2 and Article 34 of the Construction Engineering and Building Control Law, if an executing contractor deviates from approved structural drawings or safety mandates, the supervising civil engineer must immediately record the defect in the official site log, notify the executing constructor in writing, issue a formal stage report or violation notice to the municipal building authority, and formally request a stop-work order (dastoor-e tavaqqof-e kar).

What are the eligibility requirements for the Iran Nezam Civil Supervision licensure exam?

Candidates must hold an accredited Bachelor's, Master's, or Ph.D. degree in Civil Engineering recognized by the Ministry of Science, Research and Technology. A mandatory period of verified post-graduation work experience is required: 3 years for Bachelor's degree holders, 2 years for Master's degree holders, and 1 year for Ph.D. holders. Male applicants must also possess proof of completed military service or official military exemption.