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Exam Review

Key Facts: Tunisian Baccalauréat Sciences Techniques Exam

10.00/20

Direct passing composite threshold in Session Principale

Ministère de l'Éducation (Tunisie)

22 TND

Candidate registration fiscal stamp fee

Ministère de l'Éducation

Coeff 3

Technologie, Mathématiques and Sciences physiques each carry coefficient 3; TP technologie adds 1

Arrêté du 24 avril 2008 (as amended)

3–10 June 2026

Written papers of the 2026 Session Principale

Ministère de l'Éducation

Free 100-question independent English MCQ study bank for the Tunisian Baccalauréat Section Sciences Techniques. Covers electrical engineering, mechanical engineering, applied mathematics, and physical sciences. Official exams are written and laboratory-based; this is an independent study resource.

Sample Tunisian Baccalauréat Sciences Techniques Practice Questions

Try these sample questions to review concepts for the Tunisian Baccalauréat Sciences Techniques exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Apply De Morgan's laws and Boolean algebra rules to simplify the logic expression F = NOT(A · NOT(B) + C). Which of the following is the minimal product-of-sums form?
A.(NOT(A) · B) + NOT(C)
B.(NOT(A) + B) · NOT(C)
C.(A + NOT(B)) · NOT(C)
D.NOT(A) · NOT(B) + C
Explanation: Applying De Morgan's first theorem to F = NOT(X + C) where X = A · NOT(B) gives F = NOT(X) · NOT(C). Next, applying De Morgan's second theorem to NOT(A · NOT(B)) yields NOT(A) + NOT(NOT(B)) = NOT(A) + B. Combining both parts produces F = (NOT(A) + B) · NOT(C).
2A 4-variable logic function is defined by minterms m(0, 2, 8, 10) with don't-care conditions d(5, 7, 13, 15) for variables (A, B, C, D) where A is the MSB. What is the simplified minimal sum-of-products expression obtained from the Karnaugh map?
A.NOT(A) · NOT(C)
B.NOT(C) · NOT(D)
C.NOT(A) · NOT(D)
D.NOT(B) · NOT(D)
Explanation: Plotting the minterms m(0, 2, 8, 10) on a 4-variable Karnaugh map places 1s at the four corners: m0 (0000), m2 (0010), m8 (1000), and m10 (1010). These four corner cells form a single group of 4 where B = 0 and D = 0 remain constant while A and C vary. Including the don't-care conditions does not yield a larger valid prime implicant without adding redundant terms, resulting in the minimal expression NOT(B) · NOT(D).
3A standard 4-to-1 digital multiplexer has data inputs I0, I1, I2, I3 and select lines S1 (MSB) and S0 (LSB). What is the Boolean expression for its data output Y?
A.Y = NOT(S1)·NOT(S0)·I0 + NOT(S1)·S0·I1 + S1·NOT(S0)·I2 + S1·S0·I3
B.Y = S1·S0·I0 + S1·NOT(S0)·I1 + NOT(S1)·S0·I2 + NOT(S1)·NOT(S0)·I3
C.Y = (S1 + S0 + I0)·(S1 + NOT(S0) + I1)·(NOT(S1) + S0 + I2)·(NOT(S1) + NOT(S0) + I3)
D.Y = NOT(S1)·I0 + NOT(S0)·I1 + S0·I2 + S1·I3
Explanation: A multiplexer routes one of its 4 data inputs to the output based on the binary combination of its select lines. When S1S0 = 00, I0 is selected; when S1S0 = 01, I1 is selected; when S1S0 = 10, I2 is selected; and when S1S0 = 11, I3 is selected. Summing these mutually exclusive product terms gives Y = NOT(S1)·NOT(S0)·I0 + NOT(S1)·S0·I1 + S1·NOT(S0)·I2 + S1·S0·I3.
4A 74HC148 priority encoder has 8 active-low inputs /I0 through /I7 (where /I7 has highest priority) and 3 active-low binary outputs /A2, /A1, /A0. If inputs /I5 and /I2 are both held at logic 0 while all other inputs are at logic 1, what are the output states (/A2, /A1, /A0)?
A./A2=1, /A1=0, /A0=1
B./A2=0, /A1=0, /A0=0
C./A2=0, /A1=1, /A0=0
D./A2=1, /A1=1, /A0=0
Explanation: Because /I7 is the highest priority input, when both /I5 and /I2 are asserted (logic 0), the encoder prioritizes /I5 over /I2. Decimal 5 in 3-bit binary is 101_2 (A2=1, A1=0, A0=1). Since the 74HC148 outputs are active-low, the logic levels are inverted: /A2 = NOT(1) = 0, /A1 = NOT(0) = 1, /A0 = NOT(1) = 0, giving the output vector 010.
5The 74HC138 is a 3-to-8 line decoder/demultiplexer featuring three enable inputs: G1 (active-high), /G2A (active-low), and /G2B (active-low). Which condition is required for the IC to decode the select inputs A, B, C and activate one of its outputs?
A.G1 = 1, /G2A = 0, /G2B = 0
B.G1 = 0, /G2A = 1, /G2B = 1
C.G1 = 1, /G2A = 1, /G2B = 0
D.G1 = 0, /G2A = 0, /G2B = 0
Explanation: The internal enable logic of the 74HC138 computes Enable = G1 · NOT(/G2A) · NOT(/G2B). Therefore, to enable the decoder, G1 must be held high (logic 1) while both /G2A and /G2B must be held low (logic 0). If any enable condition is violated, all 8 outputs remain inactive high.
6In a 1-bit binary full adder with data inputs A and B and carry-in C_in, what is the exact Boolean expression for the carry-out bit C_out?
A.C_out = A ⊕ B ⊕ C_in
B.C_out = (A · B) ⊕ C_in
C.C_out = A · B + C_in · (A ⊕ B)
D.C_out = (A + B) · (A ⊕ C_in)
Explanation: A full adder generates a carry-out either when both primary inputs are 1 (A · B = 1) or when at least one primary input is 1 (propagated via A ⊕ B) and a carry-in is present (C_in = 1). This gives C_out = A · B + C_in · (A ⊕ B). This expression can also be written in equivalent two-level form as A·B + B·C_in + A·C_in.
7A digital transmission system requires an even parity bit P to accompany a 4-bit data word (D3, D2, D1, D0). Which logic expression correctly generates P such that the total number of 1s in the 5-bit transmitted word (D3, D2, D1, D0, P) is always even?
A.P = NOT(D3 ⊕ D2 ⊕ D1 ⊕ D0)
B.P = D3 · D2 · D1 · D0
C.P = D3 + D2 + D1 + D0
D.P = D3 ⊕ D2 ⊕ D1 ⊕ D0
Explanation: The XOR sum of bits D3 ⊕ D2 ⊕ D1 ⊕ D0 evaluates to 1 if there is an odd number of 1s in the data word, and 0 if there is an even number. Adding P = D3 ⊕ D2 ⊕ D1 ⊕ D0 ensures that whenever the data word has an odd number of 1s, P = 1, making the total count of 1s in (D3, D2, D1, D0, P) even. If the data word already has an even number of 1s, P = 0, preserving parity.
8In edge-triggered synchronous sequential logic, what is the definition of the setup time (t_su) of a D flip-flop?
A.The time elapsed between the clock transition and the valid change at output Q
B.The minimum time the data input D must remain stable before the active clock edge occurs
C.The minimum time the data input D must remain stable after the active clock edge has occurred
D.The minimum duration the clock pulse must stay at high voltage to ensure triggering
Explanation: Setup time (t_su) is the minimum time interval required for the input signal D to remain stable before the arrival of the active clock edge. Violating the setup time can lead to internal metastability, where output Q oscillates or hovers between valid logic states. In contrast, hold time (t_h) is the interval the data must remain stable after the clock edge.
9A negative-edge-triggered JK flip-flop has its inputs tied to J = 1 and K = 1. What occurs at output Q upon the arrival of each falling clock edge?
A.Output Q is reset to logic 0 regardless of its previous state
B.Output Q is set to logic 1 regardless of its previous state
C.Output Q toggles to its complement (Q_next = NOT(Q))
D.Output Q enters a high-impedance state
Explanation: In the characteristic table of a JK flip-flop, the condition J = 1 and K = 1 specifies the toggle mode: Q(n+1) = NOT(Q(n)). On each active clock edge, the output inverts its previous state, effectively dividing the input clock frequency by two.
10What is the primary technical limitation of an asynchronous (ripple) binary counter compared to a synchronous counter as the number of bits increases?
A.Cumulative propagation delays cause glitches and limit the maximum clock frequency
B.Asynchronous counters require significantly more logic gates per stage than synchronous counters
C.Asynchronous counters cannot count in reverse (down-count) mode
D.Asynchronous counters consume significantly higher static power when idle
Explanation: In an asynchronous ripple counter, each flip-flop is clocked by the output of the preceding stage. The total propagation delay is the sum of the individual delays of all flip-flops (t_total = N · t_pd). This cumulative delay causes false transient intermediate states (glitches) during decoding and severely restricts the maximum allowable clock frequency.

About the Tunisian Baccalauréat Sciences Techniques Exam

The Section Sciences Techniques of the Tunisian Baccalauréat is the national secondary school engineering and technology pathway administered nationwide by the Direction Générale des Examens under the Ministère de l'Éducation. Designed for students pursuing careers in engineering, polytechnic institutions (such as IPEST, ENIT, INSAT, ENIS, ENIM), and higher institutes of technological studies (ISET), the curriculum integrates electrical engineering (génie électrique), mechanical engineering (génie mécanique), advanced mathematics, and physical sciences. Note: This practice collection is an independent English-language MCQ study adaptation by OpenExamPrep designed for concept review; it is not an official examination or official translation.

Exam sponsor: Ministère de l'Éducation (Direction Générale des Examens), République Tunisienne. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Official coefficients: Technologie 3, Mathématiques 3, Sciences physiques 3, Travaux pratiques de technologie 1, and Français, Anglais, Philosophie, Arabe, Informatique and Sport 1 each (total 16). An optional subject adds only the points above 10/20. Written papers are sat in the June Session Principale (2026: 3–10 June); candidates averaging 7.00–9.99/20 sit the Session de Contrôle (2026: 29 June–2 July), where the better of the two marks counts for each subject retaken. This bank is an independent English-language MCQ study adaptation, not an official translation or format simulation.

Time Limit

Written papers in the June Session Principale (2026: 3–10 June); durations vary by subject, plus a practical technology (TP) paper

Passing Score

10.00/20 composite weighted average for direct pass (Session Principale); 7.00–9.99/20 qualifies for Session de Contrôle

Exam / Certification Fees

22 TND (electronic fiscal stamp / timbre fiscal électronique)

Exam sponsor website

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

Official sources

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.

~35% of this bank

Electrical Engineering (Génie Électrique)

Combinational and sequential logic, counters and registers, GRAFCET, DC, stepper and three-phase induction motors, three-phase supplies and operational amplifiers.

~35% of this bank

Mechanical Engineering (Génie Mécanique)

Kinematic joints, statics and friction, kinematics of solids, strength of materials (tension, shear, torsion, bending), gears and epicyclic trains, bearings, clutches and brakes, and ISO fits.

~15% of this bank

Physical Sciences

RC, RL and RLC circuits, resonance, mechanical oscillations and electrochemistry.

~10% of this bank

Industrial Computing

Microcontroller registers, interrupts and timers, analog-to-digital conversion and PWM, PLC scan cycles and embedded C bit operations.

~5% of this bank

Applied Mathematics

Calculus and differential equations applied to technical problems.

Preparing for the Tunisian Baccalauréat Sciences Techniques Exam

What You Need to Know

  • Passing score: 10.00/20 composite weighted average for direct pass (Session Principale); 7.00–9.99/20 qualifies for Session de Contrôle
  • Assessment: Official coefficients: Technologie 3, Mathématiques 3, Sciences physiques 3, Travaux pratiques de technologie 1, and Français, Anglais, Philosophie, Arabe, Informatique and Sport 1 each (total 16). An optional subject adds only the points above 10/20. Written papers are sat in the June Session Principale (2026: 3–10 June); candidates averaging 7.00–9.99/20 sit the Session de Contrôle (2026: 29 June–2 July), where the better of the two marks counts for each subject retaken. This bank is an independent English-language MCQ study adaptation, not an official translation or format simulation.
  • Time limit: Written papers in the June Session Principale (2026: 3–10 June); durations vary by subject, plus a practical technology (TP) paper
  • Exam / certification fees: 22 TND (electronic fiscal stamp / timbre fiscal électronique) Official sources

Using Our Practice Resources

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Tunisian Baccalauréat Sciences Techniques: Suggested Study Strategy

1Master GRAFCET automation design principles, including single sequence, OR-divergence, and AND-divergence synchronization rules.
2Practice operational amplifier circuit analysis, determining closed-loop gains for inverting, non-inverting, differential, and comparator configurations.
3Work through rigid body statics problems using the Fundamental Principle of Statics (PFS) in both planar and three-dimensional coordinate frames.
4Consolidate strength of materials (RDM) formulas for normal stress in tension, shear stress in connections, and flexural stress in beam bending.
5Drill gear train ratio calculations, planetary gear Willis formulas, and ISO fit clearance/interference determinations.

Frequently Asked Questions

What is the Tunisian Baccalauréat Section Sciences Techniques?

The Section Sciences Techniques is Tunisia's secondary school specialization dedicated to technological sciences and engineering fundamentals. It equips students with theoretical and practical competencies in electrical engineering, mechanical engineering, mathematics, and physical sciences, preparing them for engineering preparatory cycles (classes préparatoires) and technological university degrees.

What are the subject coefficients in this section?

The official coefficients are Technologie 3, Mathématiques 3, Sciences physiques 3, Travaux pratiques de technologie 1, and Français, Anglais, Philosophie, Arabe, Informatique and Sport 1 each (total 16). The overall average is the coefficient-weighted mean of the marks out of 20; an optional subject adds only the points above 10. A candidate passes directly with an average of 10.00/20 or more in the Session Principale.

What happens if a candidate averages between 7.00 and 9.99/20?

Candidates with an average of at least 7.00 and below 10.00/20 in the Session Principale sit the Session de Contrôle (29 June–2 July in 2026), retaking selected subjects; for each subject retaken, the better of the two marks is kept.

Is the official Tunisian Baccalauréat a multiple-choice examination?

No. The official Tunisian Baccalauréat Section Sciences Techniques consists of constructed-response written technical papers, engineering drawing analyses, calculations, and hands-on laboratory practicals (Travaux Pratiques). This OpenExamPrep collection is an independent English-language MCQ study adaptation developed to reinforce core engineering and scientific concepts.