100+ Free ITI/NCVT Mason Building Constructor (AITT Theory) Practice Questions

Pass your DGT/NCVT Craftsmen Training Scheme — Mason (Building Constructor) (Job role: Mason Building Construction, NCO 7112.0100) All India Trade Test Trade Theory exam on the first try — instant access, no signup required.

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Sample ITI/NCVT Mason Building Constructor (AITT Theory) Practice Questions

Try these sample questions to test your ITI/NCVT Mason Building Constructor (AITT Theory) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What type of safety sign is circular with a blue background and a white symbol?

A.Mandatory sign

B.Warning sign

C.Prohibitory sign

D.Information sign

Explanation: Circular safety signs with a blue background and white symbols are mandatory signs. They indicate actions that must be taken to comply with safety regulations, such as wearing safety goggles, safety shoes, or helmets. These signs instruct workers on protective measures to prevent workplace injuries.

2Which type of fire extinguisher is most suitable for extinguishing wood, paper, and textile fires (Class A)?

A.Water-filled or Foam extinguisher

B.Carbon Dioxide (CO2) extinguisher

C.Dry Powder extinguisher (Class D)

D.Halon extinguisher

Explanation: Class A fires involve ordinary combustible materials like wood, paper, and cloth. Water-filled or foam extinguishers are highly effective because they cool the fuel below its ignition temperature and smother the flames, preventing re-ignition. They should never be used on electrical or chemical fires due to safety risks.

3Which hand tool is specifically used by a mason to check the horizontal level of a brick course?

A.Spirit level

B.Plumb rule

C.Try square

D.Bolster

Explanation: A spirit level contains a bubble tube filled with alcohol or ether, leaving a small air bubble. When placed on a surface, the position of the bubble relative to the center marks indicates whether the surface is perfectly horizontal (level). Masons use it continuously to lay even brick and stone courses.

4What is the primary purpose of a plumb bob and line in masonry?

A.To check the verticality of a wall or column

B.To measure horizontal distances

C.To cut bricks to exact angles

D.To apply mortar to joints

Explanation: A plumb bob is a heavy, pointed metal weight suspended from a string. Due to gravity, the string hangs in a perfectly vertical line, allowing the mason to align walls, doors, and window frames vertically during construction. It is a fundamental tool for maintaining structural stability.

5According to safety regulations on a construction site, what color helmet is typically worn by safety officers?

A.Green

B.White

C.Yellow

D.Blue

Explanation: helmet color coding on construction sites helps identify personnel roles quickly. Green helmets are designated for safety officers. White helmets are worn by engineers, supervisors, and managers, yellow by general laborers, and blue by electricians or technical sub-contractors.

6Which type of trowel is specifically designed for spreading mortar over a large area of brickwork?

A.London pattern trowel

B.Pointing trowel

C.Margin trowel

D.Float

Explanation: The London pattern trowel features a diamond-shaped blade with a rounded heel, which is optimized for holding and spreading large volumes of mortar. It also allows the mason to easily tap bricks into place. Pointing trowels are much smaller and are used for finishing joint profiles.

7What is the first action to take when a co-worker suffers an electric shock from a live power tool?

A.Turn off the main power supply or isolate the source safely

B.Pull the victim away with bare hands

C.Throw water on the victim to cool them

D.Call for an ambulance before doing anything else

Explanation: The first rule of rescue is to ensure the scene is safe for the rescuer. You must immediately shut off the electrical power supply or use a dry, non-conductive object (like a wooden stick or rubber glove) to separate the victim from the live source. Touching the victim directly while they are in contact with electricity will shock the rescuer.

8How does a mason verify that the corner of two walls meets at exactly a 90-degree angle?

A.By using a Try Square or Mason's Square

B.By using a Plumb rule

C.By using a Boning rod

D.By using a Line and pins

Explanation: A Mason's Square (or Try Square) is a large, L-shaped metal tool with legs set at exactly 90 degrees. By placing the square flat against the corner of a newly laid brick course, the mason can adjust the bricks to ensure the corner is perfectly square and perpendicular. For larger layouts, the 3-4-5 rule is also used.

9At what height above the ground is it mandatory for a mason to wear a safety harness and secure a lifeline?

A.1.8 meters or above

B.1.0 meter or above

C.0.5 meters or above

D.3.0 meters or above

Explanation: Under standard occupational safety regulations (such as IS and OSHA guidelines), any work performed at a height of 1.8 meters (approximately 6 feet) or more above the ground requires fall protection. Masons must wear a full-body safety harness anchored securely to a lifeline to prevent fatal falls.

10Which hammer is most commonly used in combination with a bolster chisel to cut bricks and stones?

A.Club hammer (double-faced sledge)

B.Claw hammer

C.Ball-peen hammer

D.Brick hammer

Explanation: A club hammer (also known as a lump hammer) has a heavy, double-faced steel head weighting about 1 to 1.5 kg. Its short handle and heavy weight allow the mason to deliver heavy, controlled blows to a bolster chisel for clean cuts through bricks and stones.

About the ITI/NCVT Mason Building Constructor (AITT Theory) Exam

The CTS Mason (Building Constructor) trade trains candidates in brick and stone masonry, block work, scaffolding, concrete preparation and placement, plastering, pointing, tiling, and setting out foundation layouts. Professional knowledge covers safety, hand tools, material properties (cement, aggregates, lime, bricks, stone), mortar preparation, masonry bonds, curing, and building drainage. Successful trainees earn the National Trade Certificate (NTC) after AITT.

Assessment

One-year CTS trade (1200 hours + 150 hours OJT/group project), NSQF Level 4, trade code DGT/1020. Summative AITT includes Trade Practical plus Computer-Based Test. Engineering-trade CBT: 75 questions / 150 marks / 2 hours covering Trade Theory (with Workshop Science & Calculation and Engineering Drawing items) and Employability Skills.

Time Limit

2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule.

Passing Score

33% minimum in Trade Theory and in Employability Skills; 60% minimum in Trade Practical and Formative Assessment (DGT CTS pass regulation / AITT July 2026 guidelines). No grace marks.

Exam Fee

CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI. (Directorate General of Training (DGT), Ministry of Skill Development and Entrepreneurship)

ITI/NCVT Mason Building Constructor (AITT Theory) Exam Content Outline

10%

Safety & Hand Tools

Workshop safety, PPE, use of trowels, plumb bobs, spirit levels, square, and handling of masonry tools.

20%

Construction Materials

Properties, storage, and application of bricks, stones, cement, sand, aggregates, and mortar mix ratios.

25%

Brick & Stone Masonry

Types of brick bonds (English, Flemish, stretcher, header), stone masonry (rubble, ashlar), and construction principles.

20%

Plastering, Pointing & Tiling

Methods of plastering, plaster mixes, curing, types of pointing, and installation of wall/floor tiles.

15%

Scaffolding & Concrete Work

Types of scaffolding (single, double), concrete mixing, pouring, consolidation, and formwork construction.

10%

Building Drainage & Layout

Basic setting out of buildings, foundation types, damp proof courses (DPC), and building drainage basics.

How to Pass the ITI/NCVT Mason Building Constructor (AITT Theory) Exam

What You Need to Know

Passing score: 33% minimum in Trade Theory and in Employability Skills; 60% minimum in Trade Practical and Formative Assessment (DGT CTS pass regulation / AITT July 2026 guidelines). No grace marks.
Assessment: One-year CTS trade (1200 hours + 150 hours OJT/group project), NSQF Level 4, trade code DGT/1020. Summative AITT includes Trade Practical plus Computer-Based Test. Engineering-trade CBT: 75 questions / 150 marks / 2 hours covering Trade Theory (with Workshop Science & Calculation and Engineering Drawing items) and Employability Skills.
Time limit: 2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule.
Exam fee: CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical fees are separate — confirm with your ITI.

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

ITI/NCVT Mason Building Constructor (AITT Theory) Study Tips from Top Performers

1Focus heavily on brick bonds, mortar ratios, and stone masonry classifications, as they form the bulk of the Trade Theory paper.

2Understand the correct usage of safety equipment (PPE) and masonry hand tools like the plumb bob and spirit level.

3Review the basic properties of concrete (slump, curing time) and scaffolding types.

Frequently Asked Questions

Is ITI Mason (Building Constructor) a one-year or two-year trade?

It is a one-year trade under the CTS scheme of the Directorate General of Training (DGT), consisting of 1200 hours of training plus 150 hours of OJT.

What is the passing score for the ITI Mason AITT exam?

Trainees must score a minimum of 33% in Trade Theory CBT and Employability Skills, and a minimum of 60% in Trade Practical and Formative Assessment.

What topics are covered in the Mason Trade Theory exam?

The theory exam focuses on building materials, masonry tools, brick masonry bonds (English, Flemish), stone masonry, scaffolding, plastering, pointing, and tiling.

100+ Free ITI/NCVT Mason Building Constructor (AITT Theory) Practice Questions

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