100+ Free ITI Mechanic Auto Body Repair (AITT Theory) Practice Questions

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Sample ITI Mechanic Auto Body Repair (AITT Theory) Practice Questions

Try these sample questions to test your ITI Mechanic Auto Body Repair (AITT Theory) exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which type of fire extinguisher should be used on a flammable liquid fire, such as thinners or petrol, in an auto body workshop?

A.Class A water extinguisher

B.Class B foam or dry powder extinguisher

C.Class D metal powder extinguisher

D.Wet chemical extinguisher

Explanation: Class B fires involve flammable liquids like petrol, paint thinners, and solvents. Foam, carbon dioxide, or dry powder extinguishers starve the fire of oxygen. Water must never be used on liquid fires because it will spread the burning fuel.

2What does a circular blue safety sign with a white symbol represent in an auto body workshop?

A.Prohibition (something you must not do)

B.Warning (caution of potential hazards)

C.Mandatory action (PPE requirements or rules you must follow)

D.Emergency information and first aid location

Explanation: Circular blue signs with white pictograms indicate mandatory actions under standard safety rules. Examples include wearing safety goggles, safety shoes, or welding masks. They inform workers of required safety behaviours.

3What is the primary danger of breathing in dust created during dry sanding of old paint or body filler?

A.Immediate carbon monoxide poisoning

B.Long-term respiratory damage and inhalation of lead or toxic particulates

C.Absorption of moisture from the eyes and mouth

D.Sudden skin discoloration around the nose

Explanation: Dry sanding body fillers and old paint releases microscopic dust particles, which can contain lead and toxic chemicals. Chronic exposure can cause respiratory diseases like silicosis and lead poisoning. Dust masks and dust extraction units are essential safety equipment.

4Which body hammer is best suited for finishing work to remove minor high spots and smooth out small irregularities?

A.Heavy bumping hammer

B.Planishing hammer

C.Cross-peen hammer

D.Sledge hammer

Explanation: Planishing hammers have flat or slightly crowned faces designed to smooth and finish metal surfaces after rough shaping. They are used in combination with a dolly to level out high and low spots. They are precision tools rather than force tools.

5Why does a dinging hammer have a slightly crowned (convex) face instead of a perfectly flat face?

A.To prevent the edge of the hammer from making sharp nicks or creases in the sheet metal

B.To allow the hammer to strike around corners easily

C.To increase the weight of the hammer head

D.To allow the hammer to be used as a cutting tool

Explanation: If a hammer face were perfectly flat, striking at a slight angle would cause the sharp outer edge to cut or crease the sheet metal. A slightly crowned face ensures the impact remains flat on the crown, preventing nicks and making finishing easier.

6Which type of dolly is characterized by a flat top surface and a curved side profile, making it highly versatile for general fender and panel contours?

A.Heel dolly

B.Toe dolly

C.Utility dolly

D.Spoon dolly

Explanation: The utility dolly features several flat, crowned, and radiused surfaces. This variety makes it the most versatile hand block for general dent repair on various panel shapes and curved contours.

7What type of power source is most commonly used for tools like sanders, chisels, and grinders in a professional auto body workshop?

A.Hydraulic pressure

B.Internal combustion engines

C.Pneumatic (compressed air)

D.High-voltage direct current

Explanation: Pneumatic tools are standard in body shops. They are lighter and more compact than electric tools, and they eliminate the risk of electrical sparks, which is critical in workspaces where flammable solvents and paint fumes are present.

8When using a metric micrometer with a pitch of 0.5 mm, what is the value of one division on the thimble if the thimble has 50 graduations?

A.0.1 mm

B.0.05 mm

C.0.01 mm

D.0.001 mm

Explanation: The resolution of a micrometer is calculated by dividing the pitch of the spindle screw by the number of thimble divisions: 0.5 mm / 50 = 0.01 mm. This allows precise checks of sheet thickness and clearances.

9Which tool is best suited to check the curvature of a body panel against an undamaged symmetrical panel on the opposite side of the vehicle?

A.Tram gauge

B.Contour gauge (profile gauge)

C.Feeler gauge

D.Thread pitch gauge

Explanation: A contour gauge has adjustable pins that match the shape of any surface when pressed against it. This captured shape can then be used to check symmetry on the opposite panel.

10Why must battery ground cables be disconnected before performing any welding or major body repair on a modern vehicle?

A.To prevent the battery from discharging due to lights being left on

B.To protect the vehicle’s electronic control units (ECUs) and wiring from high-voltage surges

C.To make it easier to lift the vehicle on a hydraulic hoist

D.To prevent the coolant from boiling in the radiator

Explanation: Welding introduces high electrical currents. Disconnecting the battery grounds isolates sensitive vehicle computers (ECUs) and protects them from high-voltage surges that could fry internal components.

About the ITI Mechanic Auto Body Repair (AITT Theory) Exam

Mechanic Auto Body Repair is a one-year engineering CTS trade delivered through ITIs. Trainees learn safety precautions, hand and power tools, sheet metal properties, fitting, welding processes (MIG/TIG, spot, gas), collision damage analysis, dent removal, panel shrinking, body filler, plastic repair, structural alignment on frame machines, 3D measurement, windshield replacement, and safety accessories like airbags. AITT theory CBT plus practical assessment lead to the NTC.

Assessment

Summative AITT under DGT/NCVT for the one-year CTS Mechanic Auto Body Repair trade. Engineering-trade CBT: 75 MCQs / 150 marks in 2 hours — Trade Theory 38 + Workshop Calculation & Science 6 + Engineering Drawing 6 (100 marks) and Employability Skills 25 (50 marks). Trade Practical is assessed separately; formative (internal) assessment is maintained by the ITI. Successful candidates receive the National Trade Certificate (NTC).

Time Limit

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

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 and other institute fees are notified separately on SIDH — confirm with your ITI. (Directorate General of Training (DGT) / National Council for Vocational Training (NCVT))

ITI Mechanic Auto Body Repair (AITT Theory) Exam Content Outline

15%

Safety and Tools

Occupational safety, PPE, fire safety, body hammers, dollies, spoons, and precision measurement.

15%

Sheet Metal and Fitting

Sheet metal properties, cutting, bending, hemming, flanging, and mechanical fasteners.

20%

Welding and Cutting

Gas welding, MIG/MAG, TIG, spot welding, plasma cutting, and weld defects.

25%

Damage Analysis and Dent Repair

Collision analysis, hammer/dolly techniques, hot/cold metal shrinking, fillers, and plastic welding.

15%

Structural Repair and Alignment

Frame construction, frame machines, tram and 3D measuring systems, and panel alignments.

Fittings and Glass

Windshield bonding, ceramic frit, door latch systems, trim, and airbag safety.

Workshop Math and Science

Numeracy calculations, mechanical advantage of hydraulic jacks, stress-strain, and thermal properties.

How to Pass the ITI Mechanic Auto Body Repair (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: Summative AITT under DGT/NCVT for the one-year CTS Mechanic Auto Body Repair trade. Engineering-trade CBT: 75 MCQs / 150 marks in 2 hours — Trade Theory 38 + Workshop Calculation & Science 6 + Engineering Drawing 6 (100 marks) and Employability Skills 25 (50 marks). Trade Practical is assessed separately; formative (internal) assessment is maintained by the ITI. Successful candidates receive the National Trade Certificate (NTC).
Time limit: 2 hours for CBT (AITT July 2026 DGT guidelines). Practical duration follows the DGT/State Directorate schedule for the sitting.
Exam fee: CBT fee ₹213 per trainee for AITT July 2026 mains (plus applicable payment-gateway charges). Practical and other institute fees are notified separately on SIDH — 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 Mechanic Auto Body Repair (AITT Theory) Study Tips from Top Performers

1Focus revision on high-yield professional skills: MIG/MAG and spot welding, hammer/dolly metal finishing, body fillers, and unibody frame measurement/pulling.

2Practice numerical calculations for area, volume, levers, and stress-strain, as these topics represent the Workshop Calculation & Science components of the CBT Trade Theory block.

3Integrate practical workshop observations—such as correct windshield urethane preparation, plastic bumper weld smearing, and safety precautions around SRS airbags—into your study routine.

Frequently Asked Questions

What is the ITI/NCVT Mechanic Auto Body Repair AITT theory exam?

It is the All India Trade Test theory CBT administered by DGT for trainees completing the one-year CTS Mechanic Auto Body Repair course at ITIs. The CBT covers Trade Theory (with Workshop Calculation & Science and Engineering Drawing) plus Employability Skills; a separate Trade Practical exam is also required for the National Trade Certificate.

How many questions and how much time are in the AITT CBT?

Per DGT AITT July 2026 guidelines, the CBT is 75 multiple-choice questions for 150 marks in two hours: 50 questions (100 marks) in the Trade Theory block (38 trade theory + 6 WSC + 6 engineering drawing) and 25 Employability Skills questions (50 marks).

What are the pass marks for Mechanic Auto Body Repair AITT?

DGT requires at least 33% in Trade Theory and 33% in Employability Skills, and at least 60% in Trade Practical and Formative Assessment. There are no grace marks. Confirm any session-specific notifications on the DGT exam corner or SIDH.

What is the CBT examination fee?

For AITT July 2026 mains, DGT notified a CBT fee of ₹213 per trainee (plus payment-gateway charges), payable online via SIDH. Practical fees are separate — ask your ITI for the exact amount for your sitting.