100+ Free Bac STI2D Practice Questions

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Question 1

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An automated system is classically decomposed into a 'chaine d'energie' and a 'chaine d'information'. What is the primary role of the chaine d'information?

To acquire, process and transmit data to control the system

To provide the structural frame of the product

To convert electrical energy into motion

To store mechanical energy in flywheels

to track

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2026 Statistics

Key Facts: Bac STI2D Exam

STI2D is a French technological bac whose two terminal specialty exams (2I2D and Physique-Chimie et Mathematiques) each count coefficient 16; from 2026 the 2I2D adds a 2h practical to a shortened 3h30 written paper.

Sample Bac STI2D Practice Questions

Try these sample questions to test your Bac STI2D exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the STI2D systemic approach, every technical system is analysed through three interacting domains. Which set correctly names these three domains?

A.Matter, energy and information

B.Mass, force and speed

C.Cost, quality and time

D.Hardware, firmware and software

Explanation: The whole STI2D transversal programme is built on the 'matiere - energie - information' triad. Every studied object or installation is analysed in terms of the matter it processes, the energy it converts, and the information it handles.

2An automated system is classically decomposed into a 'chaine d'energie' and a 'chaine d'information'. What is the primary role of the chaine d'information?

A.To store mechanical energy in flywheels

B.To convert electrical energy into motion

C.To acquire, process and transmit data to control the system

D.To provide the structural frame of the product

Explanation: The chaine d'information acquires data (sensors), processes it (controller) and communicates it, in order to pilot the chaine d'energie. The chaine d'energie alimente, distribue, convertit and transmits energy to the effector.

3In the standard chaine d'energie 'Alimenter - Distribuer - Convertir - Transmettre', which block does a gear reducer (reducteur) belong to?

A.Alimenter

B.Distribuer

C.Convertir

D.Transmettre

Explanation: A gear reducer adapts the mechanical energy (torque/speed) coming from the converter to the effector, so it belongs to the 'Transmettre' function. It transmits and adapts mechanical energy without converting its form.

4In SysML, which diagram is typically used to describe the use cases (cas d'utilisation) of a system, i.e. the services it renders to its actors?

A.Use case diagram (uc)

B.Sequence diagram (seq)

C.Block definition diagram (bdd)

D.State machine diagram (stm)

Explanation: The use case diagram (diagramme de cas d'utilisation, uc) shows the functions/services a system offers and the actors who interact with it. It answers 'what does the system do for whom?'.

5An ecart de performance is defined in STI2D as the difference between which two of the following?

A.The cost and the selling price of a product

B.The performance of two competing products

C.The energy in and the energy out of a system

D.Expected/measured performance and simulated/required performance

Explanation: STI2D analyses three 'ecarts': between expected and measured (cahier des charges vs reality), between measured and simulated (real vs model), and between expected and simulated (specification vs model). These gaps drive the engineering analysis of a system.

6A FAST diagram (Function Analysis System Technique) is read from left to right answering successive questions. The arrow from a function to a sub-function answers which question?

A.Why is this function performed?

B.When is this function performed?

C.How is this function performed?

D.Who performs this function?

Explanation: In a FAST diagram, moving rightward (towards technical solutions) answers 'How?' (comment), while moving leftward answers 'Why?' (pourquoi). This decomposes a service function into technical solutions.

7The 'bete a cornes' (horned-beast) diagram used in functional analysis answers three questions about a product. Which question does it NOT directly address?

A.A qui le produit rend-il service? (Whom does it serve?)

B.Sur quoi agit-il? (What does it act upon?)

C.Dans quel but? (For what purpose?)

D.Combien coute-t-il a fabriquer? (What is its production cost?)

Explanation: The bete a cornes captures the need: whom it serves, what it acts on, and in what aim. Production cost is an economic constraint addressed elsewhere (cahier des charges, eco-design), not by this need-expression tool.

8In a flow representation (representation des flux), a flow of information differs from a flow of energy mainly because information flows:

A.Always carry significant power

B.Carry data with negligible power compared with energy flows

C.Cannot be digital

D.Only exist inside the chaine d'energie

Explanation: Information flows transport data (measurements, commands) and convey negligible power compared with energy flows. This is why a low-power sensor signal can pilot a high-power actuator through the chaine d'energie.

9In the I2D exam, the first compulsory exercise asks candidates to analyse a pluritechnological product across the common themes. These themes are:

A.Marketing, finance and law

B.Matter, energy and information

C.Biology, geology and chemistry

D.History, geography and civics

Explanation: The common (transversal) exercise of the 2I2D written paper assesses knowledge in matter, energy and information on a real pluritechnological system, before the specialty-specific exercise.

10A 'systeme asservi' (closed-loop / servo system) is characterised by the presence of which element compared with an open-loop system?

A.A power supply

B.A mechanical reducer

C.A feedback (return / capteur de mesure) comparing output to the setpoint

D.A user interface

Explanation: A closed-loop (asservi) system measures its output with a sensor and compares it to the setpoint (consigne); the error drives a correction. The feedback loop is what distinguishes it from an open-loop command.

About the Bac STI2D Exam

The STI2D baccalaureat is a French technological diploma with scientific and technological dominants, taken at the end of the lycee cycle (Premiere and Terminale). In Terminale, students follow the common I2D core of the specialty 'Ingenierie, innovation et developpement durable' (2I2D) plus one of four fields: Architecture et construction (AC), Energies et environnement (EE), Innovation technologique et eco-conception (ITEC), or Systemes d'information et numerique (SIN), together with Physique-Chimie et Mathematiques. The two terminal specialty exams carry coefficient 16 each and, from the 2026 session, the 2I2D exam combines a 3h30 written paper with a new 2h practical (epreuve pratique). The programme is built around the matter-energy-information triad, the energy and information chains, eco-conception and sustainable development. It prepares students for higher technological and scientific studies such as BTS, BUT, engineering schools and CPGE of the TSI pathway.

Questions

100 scored questions

Time Limit

Physique-Chimie et Mathematiques 3 h; 2I2D 3 h 30 written plus 2 h practical (from 2026)

Passing Score

Overall 10/20 average; 8-9.99 goes to rattrapage. Each specialty exam carries coefficient 16.

Exam Fee

Free for candidates in French public lycees (state-administered examination). (Ministere de l'Education nationale (DGESCO), via the academies)

Bac STI2D Exam Content Outline

12%

Flux and system modeling

Matter-energy-information triad, energy and information chains, SysML, functional analysis, performance gaps.

12%

Design and innovation

Innovation, competitiveness, value analysis, project approach, CAD, prototyping, industrial property.

13%

Eco-design and sustainability

Eco-conception, life-cycle assessment, three pillars of sustainable development, embodied energy, recycling.

13%

Structures and materials

Statics, stress, Young's modulus, yield strength, safety factor, composites, concrete, thermal insulation.

14%

Energy chains and conversion

Efficiency, electrical and AC power, renewables, motors, transformers, energy transport and storage.

13%

Information systems and networks

Sensors, binary/hex/ASCII coding, ADC, algorithmics, networks/IP, IoT, logic, embedded systems.

13%

Applied physics-chemistry

Energy conservation, mechanical/thermal/chemical energy, redox, fuel cells, waves and signals, uncertainty.

10%

Applied mathematics

Integration, exponential and logarithm, sequences, differential equations, complex numbers, probability.

How to Pass the Bac STI2D Exam

What You Need to Know

Passing score: Overall 10/20 average; 8-9.99 goes to rattrapage. Each specialty exam carries coefficient 16.
Exam length: 100 questions
Time limit: Physique-Chimie et Mathematiques 3 h; 2I2D 3 h 30 written plus 2 h practical (from 2026)
Exam fee: Free for candidates in French public lycees (state-administered examination).

Keys to Passing

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

Bac STI2D Study Tips from Top Performers

1Master the matter-energy-information triad and the energy/information chains first, because every 2I2D problem analyses a real system through these lenses.

2Do not neglect any field: the common transversal exercise tests matter, energy and information regardless of your AC, EE, ITEC or SIN specialty.

3Practise core calculations: efficiency (rendement), electrical power (P = R I squared, U I cos phi), statics (triangle des forces) and binary/hex conversions.

4In Physique-Chimie et Mathematiques, train the maths-physics links: energy as the integral of power, exponential/log solutions of differential equations, and uncertainties.

5Work full past papers under timed conditions (3 h and 3 h 30) and prepare the 2-hour practical added from 2026.

6Revise eco-conception and the life-cycle assessment (ACV) vocabulary, since sustainability themes appear across all specialties.

Frequently Asked Questions

What is the STI2D baccalaureat?

STI2D (Sciences et Technologies de l'Industrie et du Developpement Durable) is a French technological baccalaureat with scientific and technological dominants, centred on engineering, technological innovation and sustainable development, administered by the Ministere de l'Education nationale.

What are the four STI2D specialty fields?

In Terminale, students choose one field within 2I2D: Architecture et construction (AC), Energies et environnement (EE), Innovation technologique et eco-conception (ITEC), or Systemes d'information et numerique (SIN), in addition to the common I2D core.

What is the coefficient of the STI2D specialty exams?

Each of the two terminal specialty exams, 'Ingenierie, innovation et developpement durable' (2I2D) and 'Physique-Chimie et Mathematiques', carries coefficient 16, making them the most decisive parts of the bac.

What changed in the 2I2D exam in 2026?

Following the note de service of June 2025 (BO no. 24, 12 June 2025), the 2026 session introduced a 2-hour practical (epreuve pratique) and shortened the written paper to 3 h 30; together they make up coefficient 16.

Is the real STI2D exam multiple-choice?

No. The real exams are written papers with structured analysis of real pluritechnological systems, calculations and a practical. These free MCQs are a revision tool to consolidate the programme's key concepts and formulas.

What studies can STI2D lead to?

STI2D prepares for higher technological and scientific studies such as BTS, BUT, engineering schools, science licences and CPGE of the TSI (Technologie et Sciences Industrielles) pathway.