Free Practice Questions for Bac SI (Sciences de l'Ingenieur)

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Key Facts: Bac SI (Sciences de l'Ingenieur) Exam

The Bac Sciences de l'Ingenieur speciality carries a coefficient of 16 in the French baccalaureat general (Ministere de l'Education nationale).

The written exam lasts 3 h 30 and is built around the engineering study of a real pluri-technologique product.

On the written paper the Sciences de l'ingenieur part counts for about 75% and the associated sciences physiques part for about 25%, each marked out of 20.

Every automated system is modelled as a chaine d'energie and a chaine d'information that exchange orders and feedback.

Instantaneous power equals an effort variable times a flow variable, for example torque times angular velocity (P = C x omega) for rotation.

The SI programme uses SysML for systems modelling, limited to the bases strictly necessary rather than as an end in itself.

A Terminale collaborative project of about 48 hours supports the separate Grand oral.

The 2026 written speciality exams are scheduled for 16-17 June 2026, set nationally by the Ministere de l'Education nationale.

Coefficient-16 French baccalaureat speciality: a 3 h 30 written exam combining Sciences de l'ingenieur (~75%, /20) with an associated physics part (~25%, /20) plus a 1-hour practical, covering systems engineering, mechanics, automatic control and information processing.

Sample Bac SI (Sciences de l'Ingenieur) Practice Questions

Try these sample questions to review concepts for the Bac SI (Sciences de l'Ingenieur) exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the French Sciences de l'Ingenieur (SI) approach, a technical system is described by two interacting chains. Which pair correctly names them?

A.The energy chain (chaine d'energie) and the information chain (chaine d'information)

B.The input chain and the output chain

C.The mechanical chain and the electrical chain

D.The analog chain and the digital chain

Explanation: In SI, every automated system is modelled as a chaine d'energie (power flow) and a chaine d'information (signal flow) that communicate through orders and feedback. This decomposition structures almost all SI analysis.

2The classic functions of the chaine d'energie, in order, are usually given as:

A.Acquerir, Traiter, Communiquer

B.Alimenter, Distribuer, Convertir, Transmettre

C.Modeliser, Simuler, Valider

D.Capter, Amplifier, Afficher

Explanation: The energy chain delivers power to act on the matiere d'oeuvre through Alimenter (supply), Distribuer (e.g. preactionneur), Convertir (actionneur), Transmettre, then Agir. Stocker may also appear.

3The functions of the chaine d'information are best summarised as:

A.Alimenter, Distribuer, Convertir

B.Amplifier, Filtrer, Rectifier

C.Acquerir, Traiter, Communiquer

D.Stocker, Transmettre, Agir

Explanation: The information chain handles signals: Acquerir (sensors capture a physical quantity), Traiter (a processor/microcontroller computes), and Communiquer (send orders or display). It controls the energy chain.

4Instantaneous power in a power link is the product of an effort variable and a flow variable. For mechanical rotation, this is:

A.Force x velocity

B.Pressure x volume flow rate

C.Voltage x current

D.Torque x angular velocity

Explanation: For rotational mechanics the effort is the torque C (N.m) and the flow is the angular velocity omega (rad/s), so P = C x omega. SI couples effort and flow variables for each physical domain.

5In an electrical power link, the effort and flow variables that multiply to give power are respectively:

A.Voltage (V) and current (A)

B.Current and resistance

C.Charge and time

D.Power and energy

Explanation: Electrical power is P = U x I, where the effort variable is the voltage U in volts and the flow variable is the current I in amperes. This mirrors the general effort-flow product used throughout SI.

6The systems-modelling language recommended by the SI programme for describing complex systems is:

A.UML only

B.SysML

C.GRAFCET only

D.VHDL

Explanation: The SI programme uses SysML (Systems Modeling Language), a profile of UML created for systems engineering. The programme insists it be limited to the bases strictly necessary, not taught as an end in itself.

7Which SysML diagram is used to express the system requirements (the exigences) a product must satisfy?

A.Block definition diagram (bdd)

B.Sequence diagram

C.Requirement diagram (diagramme des exigences)

D.State machine diagram

Explanation: The requirement diagram (diagramme des exigences / req) captures the system's exigences and their relationships (containment, derivation, satisfaction). It links needs to the structural and behavioural blocks.

8An engineer wants to model the internal structure of a system showing its parts, ports and the flows between them. The most appropriate SysML diagram is the:

A.Activity diagram

B.Use case diagram

C.Requirement diagram

D.Internal block diagram (ibd)

Explanation: The internal block diagram (ibd) shows the internal composition of a block: its parts, ports and the item/flow connections between them. It is ideal for tracing energy and information flows inside the system.

9In functional analysis, the matiere d'oeuvre (working matter) acted on by a system can be of three types. Which list is correct?

A.Product (matter), energy, information

B.Solid, liquid, gas

C.Input, process, output

D.Hardware, firmware, software

Explanation: The matiere d'oeuvre is what the system transforms and to which it adds value: it is a product/material, energy, or information. The added value (valeur ajoutee) is the change produced by the system.

10Within the energy chain, the component that physically converts the supplied energy into the useful energy (for example an electric motor turning electrical into mechanical energy) realises the function:

A.Alimenter

B.Convertir

C.Distribuer

D.Acquerir

Explanation: The Convertir function is realised by the actionneur (e.g. motor, vErin), which transforms one form of energy into the form needed to act. A motor converts electrical to rotational mechanical energy.

About the Bac SI (Sciences de l'Ingenieur) Exam

The Sciences de l'Ingenieur (SI) speciality of the French baccalaureat general is one of two coefficient-16 speciality subjects taken in the Terminale year. The terminal written exam lasts 3 h 30 and is built around the engineering study of a real, pluri-technologique product: it combines a Sciences de l'Ingenieur part (about 3 h, worth roughly 75%) with an associated sciences physiques part (about 1 h, worth roughly 25%), each marked out of 20 on a separate copy, and is completed by a 1-hour practical. The official Eduscol programme covers systems engineering and SysML modelling, the chaine d'energie and chaine d'information, mechanics (statics, kinematics, dynamics, energetics), automatic control and asservissements, electricity and electronics, transmission of power, information processing and a simplified view of artificial intelligence, all framed by performance and sustainable development. A 48-hour collaborative project in Terminale supports the separate Grand oral. The subject prepares students for engineering schools and scientific higher education in France.

Exam sponsor: Ministere de l'Education nationale (France). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Questions

100 questions

Time Limit

Written: 3 h 30 (SI ~3 h + associated physics ~1 h); practical: 1 h

Passing Score

Marked out of 20; baccalaureat awarded at average 10/20. SI speciality coefficient 16, with the written SI part ~75% and the associated sciences physiques part ~25%.

Exam / Certification Fees

No separate fee for candidats scolaires (free public exam); candidats libres may pay minor administrative costs.

Exam sponsor website

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

Official sources

Ministere de l'Education nationale (France): official exam information

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.

20%

Analyse, modelisation et ingenierie systeme

Systems engineering, functional analysis, SysML diagrams, chaine d'energie and chaine d'information, effort-flow power links and the engineering approach.

22%

Mecanique (statique, cinematique, dynamique, energetique)

Static equilibrium and moments, torseurs and liaisons, kinematic diagrams, circular motion, Newton's second law, kinetic and potential energy and work.

18%

Automatique et asservissements

Open- and closed-loop control, comparator and error, transfer functions, block diagrams, proportional/PID correctors, first-order response, stability, accuracy and speed.

18%

Electricite, electronique et transmission de puissance

Ohm's law and Joule effect, resistor networks, DC motors and PWM, gears and reduction ratios, epicyclic trains, belt drives and screw-nut systems.

12%

Traitement de l'information et programmation

Sensors, analog-to-digital conversion, GRAFCET, simplified artificial intelligence, data rates, modulation and network frames and encapsulation.

10%

Resistance des materiaux, developpement durable et physique associee

Stress and strain, Hooke's law, structural loadings and safety factor, life-cycle analysis and sustainability, and the associated physics.

Preparing for the Bac SI (Sciences de l'Ingenieur) Exam

What You Need to Know

Passing score: Marked out of 20; baccalaureat awarded at average 10/20. SI speciality coefficient 16, with the written SI part ~75% and the associated sciences physiques part ~25%.
Exam length: 100 questions
Time limit: Written: 3 h 30 (SI ~3 h + associated physics ~1 h); practical: 1 h
Exam / certification fees: No separate fee for candidats scolaires (free public exam); candidats libres may pay minor administrative costs. Official sources

Using Our Practice Resources

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Bac SI (Sciences de l'Ingenieur): Suggested Study Strategy

1Master the effort-flow power pairs and the two functional chains: chaine d'energie (alimenter, distribuer, convertir, transmettre) and chaine d'information (acquerir, traiter, communiquer).

2Practise the core formulas and SI units: P = C x omega, v = R x omega, sigma = F/S, U = R x I, P = R x I^2, eta = P_out/P_in, and the FTBF A/(1+A).

3Work full past papers (annales) under timed conditions; treat the SI study and the associated physics part as separate ~3 h and ~1 h tasks on separate copies.

4Be fluent with the standard SysML diagrams (requirements, bdd, ibd) and with normalised liaisons (pivot, glissiere, rotule) and their degrees of freedom.

5For asservissements, remember the trade-off between stability, accuracy and speed, and the roles of proportional, integral and derivative actions.

6Always check units and orders of magnitude; many marks are lost converting rpm to rad/s, minutes to seconds, or mm^2 to m^2.

Frequently Asked Questions

How long is the Bac Sciences de l'Ingenieur written exam and how is it structured?

The written paper lasts 3 h 30. It is built around the engineering study of a real product, with a Sciences de l'ingenieur part of about 3 hours and an associated sciences physiques part of about 1 hour, each marked out of 20 on a separate copy. A 1-hour practical is taken separately.

What is the coefficient of the Sciences de l'Ingenieur speciality?

It carries a coefficient of 16 in the baccalaureat general, like every Terminale speciality. The two retained specialities together count for 32 of the 100 total points of the diploma.

How are the SI and physics parts weighted?

On the written paper the Sciences de l'ingenieur part counts for about 75% of the mark and the associated sciences physiques part for about 25%. Each part is marked out of 20.

What topics are on the Terminale SI programme?

Systems engineering and SysML, the chaine d'energie and chaine d'information, mechanics (statics, kinematics, dynamics, energetics), automatic control and asservissements, electricity and electronics, transmission of power, information processing, a simplified view of artificial intelligence, and sustainable development, plus the associated physics.

What is the 48-hour project used for?

In Terminale, SI students carry out a collaborative project of about 48 hours to design all or part of a product. This project serves as the support for the separate Grand oral (epreuve orale terminale), not for the written exam.

When does the 2026 Bac SI exam take place?

The written speciality exams are held on 16-17 June 2026, on dates set nationally by the Ministere de l'Education nationale, with the practical organised by the academies.