This Chemistry Practice Test contains 50 random multiple-choice questions drawn from core chemistry topics to help you prepare for the DOST Junior Level Scholarship Screening (JLSS). Questions cover fundamentals and applied concepts from Matter, Atomic Structure, Molecules, Acids and Bases, Chemical Reactions, Solubility, Stoichiometry, Thermodynamics, Quantum Theory, the Periodic Table, and Chemical Bonding.
This practice test is designed to evaluate both your conceptual understanding and your problem-solving skills. It mixes direct recall items with calculation problems and short conceptual questions that reflect the kinds of chemistry tasks commonly required in science scholarship exams.
Clict the red START button below to proceed to the practice test. Read each question carefully and choose the best answer from the options provided. Correct answers are indicated in green, while incorrect answers are shown in red.
Topics Covered in the Actual JLSS Exam
Expect questions from the following areas:
- Matter: classification, properties, and changes of state
- Atomic Structure: subatomic particles, isotopes, and electron configuration
- Molecular Structure: geometry, polarity, and intermolecular forces
- Acids and Bases: pH, indicators, and neutralization reactions
- Chemical Reactions: reaction types, balancing equations, and stoichiometry
- Solubility: rules, saturation, and concentration problems
- Stoichiometry: mole concept, limiting reagents, and percent yield
- Thermodynamics: enthalpy, heat transfer, and spontaneity
- Quantum Theory: quantized energy levels and atomic spectra
- Periodic Table & Trends: atomic radius, ionization energy, and electronegativity
- Chemical Bonding: ionic, covalent, and metallic bonds
Conceptual Tips and Reasoning Strategies
- Understand why a concept works — not just how.
- Don’t confuse strong acids with concentrated acids.
- Remember: Exothermic = releases heat, Endothermic = absorbs heat.
- Watch for keywords like dilute, concentrated, or neutral.
- For periodic trends, recall the general directions:
- Atomic radius decreases across a period and increases down a group
- Ionization energy and electronegativity show the opposite trend
- For molecular shape, apply VSEPR theory to determine geometry and polarity.
Exam-Day and Time Management Tips
- Aim for 1.5 to 2 minutes per question on average.
- Answer easy questions first to secure points.
- Skip difficult ones temporarily and return later.
- Use elimination to improve your odds on tough items.
- Keep calculations neat for quick review.
Final Reminder for the Actual DOST-JLSS Exam
During the real DOST-JLSS exam, accuracy and focus are more valuable than speed. Read every question carefully and double-check your calculations before finalizing your answer. Manage your time wisely, and don’t get stuck on one problem. Trust your preparation, stay calm, and use elimination for uncertain items.
Get enough sleep before test day, eat light but nourishing food, and bring everything you need for the exam. Stay confident — every correct answer brings you closer to your goal of becoming a DOST scholar.