Official PCT Exam (Physics - Chemistry - Technology) — BEPC Session 2020

This document contains the official Physics - Chemistry - Technology (PCT) exam from the 2020 session of the Brevet d'Études du Premier Cycle (BEPC). It offers a varied and stimulating paper that draws on cross-cutting skills in chemistry, physics, and technology, accompanied by its complete answer key.

Exam Structure

The exam unfolds in three distinct sections:

• Knowledge Assessment: this section adopts a diversified format with true/false exercises, MCQs (multiple choice questions), and definitions to formulate. The concepts assessed include the definition of chemical element, simple machine, and motor, the plastics PET and PS, the concept of non-biodegradable materials, and the role of the camshaft in an engine. This variety of formats tests different facets of understanding: recognition, recall, and precise formulation.

• Applications Assessment: the second section offers problem-solving exercises. Students work on simple machines with force and efficiency calculations, the synthesis of water with chemical equation balancing and stoichiometric calculations, the study of a gear system with transmission ratio and rotational speed, and the creation of a standardized electrical circuit diagram. These exercises assess the ability to apply laws and formulas in concrete contexts.

• Competency Assessment: the most complex section focuses on the identification of chemical solutions through experimental tests. Students must implement an investigative approach to identify unknown solutions by performing characteristic tests: detection of chloride ions (silver nitrate test), hydroxide ions (pH paper or indicator test), and identification of calcium sulfate. This section emphasizes scientific reasoning and experimental rigor.

Complete Answer Key Included

The document provides a comprehensive answer key with justified answers, balanced chemical equations, and explanatory diagrams. Each resolution step is detailed to facilitate understanding and self-assessment.

Target Audience

This exam paper is an excellent revision resource for BEPC candidates, a pedagogical tool for teachers, and a study guide for students preparing independently. The emphasis on chemical experimentation and investigative methodology makes it a particularly enriching paper.