ENEM Practice Test 2026
AI-generated ENEM practice sets for Languages & Codes, Human Sciences, Natural Sciences, Mathematics, with scoring and explanations. Start with 30 free question credits on signup.
About the ENEM exam
The Exame Nacional do Ensino Médio (ENEM) is a university entrance examination administered in Brazil. It is designed to assess candidates' knowledge and proficiency across 5 key subject areas including Languages & Codes, Human Sciences, Natural Sciences, Mathematics. This exam is widely recognized as an essential benchmark for students and professionals.
Use short ENEM practice sets to identify topics to revisit. Choose a subject and difficulty, answer questions, then review the explanations. New accounts get 30 question credits; further new questions use paid credits. Retaking previously seen questions is free.
Whether you're a first-time candidate or retaking the ENEM to improve your score, InfinityMock helps you identify your strengths and weaknesses through detailed performance analytics. Our platform covers Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing, with questions available at Easy, Medium, and Hard difficulty levels. Track your progress, review detailed explanations, and build the confidence you need to pass on exam day.
ENEM — quick answers
What is the ENEM?
The Exame Nacional do Ensino Médio (ENEM) is a university entrance examination taken in Brazil. It assesses 5 subject areas: Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing.
Where can I find free ENEM practice questions?
This page carries 8 free ENEM practice questions, each with a worked explanation. No account is needed to read them. Sign up for 30 free question credits to continue with a subject practice set.
What subjects does the ENEM cover?
Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing. On InfinityMock you can practise a single subject or take a mixed test across all 5.
How much does InfinityMock cost?
New accounts get 30 question credits free. After that, 30 credits cost $1 and 150 credits cost $5. One credit covers one new question; re-attempting a question you have already seen is always free.
ENEM at a glance
| Exam | Exame Nacional do Ensino Médio (ENEM) |
|---|---|
| Category | University Entrance |
| Country / region | Brazil |
| Subjects covered | 5 — Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing |
8 free ENEM practice questions (2026)
Answer these first — no signup, no card. Every answer is explained. For more practice, sign up for 30 free question credits and choose a subject above.
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A discharge of untreated domestic sewage into a lake increases nutrients like nitrogen and phosphorus. This causes rapid multiplication of algae, which blocks light and eventually depletes oxygen in the water, causing fish to die. What is the name of this environmental phenomenon?
- Biomagnification
- Eutrophication
- Acidification
- Salinization
Show answer & explanation
Answer: B. Eutrophication
Eutrophication is the process where water bodies receive excess nutrients, stimulating excessive plant and algae growth, which depletes dissolved oxygen and harms aquatic life.
Topic: Natural Sciences · easy
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Thermos flasks are designed to keep liquids hot or cold for long periods. Their inner glass walls are silvered (reflective) to prevent heat transfer. Which heat transfer process is mainly minimized by the silvered surfaces of a thermos flask?
- Conduction
- Convection
- Radiation
- Evaporation
Show answer & explanation
Answer: C. Radiation
The silvered walls of a thermos flask reflect infrared radiation back into the liquid (or away from it), minimizing heat transfer via electromagnetic waves (radiation).
Topic: Natural Sciences · easy
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In a municipal water treatment plant, solid impurities suspended in the raw water are allowed to settle to the bottom of large tanks over time before the water is filtered. What is the name of this physical separation process?
- Decantation
- Distillation
- Centrifugation
- Chromatography
Show answer & explanation
Answer: A. Decantation
Decantation uses gravity to separate suspended solid particles from a liquid by letting them settle at the bottom of a container over time.
Topic: Natural Sciences · easy
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A person bitten by a venomous snake needs immediate treatment containing ready-made antibodies to neutralize the toxin, whereas a healthy person receives a weakened pathogen to stimulate their own body to produce antibodies for future protection. What are these two types of immunizing agents called, respectively?
- Vaccine and Serum
- Serum and Vaccine
- Antibiotic and Vaccine
- Serum and Antibiotic
Show answer & explanation
Answer: B. Serum and Vaccine
Serum provides passive, immediate immunity using pre-formed antibodies (crucial for venom), while a vaccine provides active, long-term immunity by stimulating the immune system to produce its own antibodies.
Topic: Natural Sciences · easy
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Wind farms convert the kinetic energy of moving air masses into electrical energy using large turbines. What is the primary source of energy that drives the global wind cycles on Earth?
- Geothermal heat
- Solar radiation
- Tidal forces
- Gravitational pull
Show answer & explanation
Answer: B. Solar radiation
Solar radiation heats the Earth's atmosphere unevenly, creating temperature and atmospheric pressure differences that generate wind.
Topic: Natural Sciences · easy
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Wet clothes hung on a outdoor clothesline dry over time even when the ambient temperature is well below 100 degrees Celsius. What is the name of the state transition process occurring in this scenario?
- Boiling
- Evaporation
- Condensation
- Sublimation
Show answer & explanation
Answer: B. Evaporation
Evaporation is the gradual vaporization of a liquid that occurs only at its surface and can happen at any temperature below the boiling point.
Topic: Natural Sciences · easy
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Muscle cells require a large amount of energy to perform contractions during physical exercise. Consequently, these cells contain a high concentration of a specific organelle responsible for aerobic cellular respiration. Which organelle is responsible for this function?
- Lysosome
- Mitochondrion
- Ribosome
- Golgi apparatus
Show answer & explanation
Answer: B. Mitochondrion
Mitochondria are the organelles responsible for aerobic cellular respiration, which converts glucose and oxygen into ATP, the primary energy currency of the cell.
Topic: Natural Sciences · easy
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When a straight straw or spoon is partially submerged in a transparent glass of water, it appears to be bent or broken at the water's surface when viewed from the side. Which wave phenomenon explains this visual effect?
- Reflection
- Refraction
- Diffraction
- Polarization
Show answer & explanation
Answer: B. Refraction
Refraction is the bending of light as it passes from one medium (water) to another (air) due to the change in its propagation speed.
Topic: Natural Sciences · easy
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ENEM Exam Subjects
Available practice subjects: Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing. Select a subject for focused preparation. Coverage is not a guarantee of the complete official syllabus.
📖 ENEM Study Guide
Read our comprehensive How to Pass the ENEM in 2026 — Complete Study Guide for expert preparation tips, study plans, and strategies.
🔗 Related Exams
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Frequently Asked Questions
Is this ENEM practice test free?
Yes! InfinityMock offers free ENEM practice tests with 30 complimentary credits on signup. Each AI-generated question costs 1 credit, and previously seen questions are always free to retake.
How many ENEM practice questions are available?
InfinityMock offers AI-generated practice in Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing. One new question costs one credit; new accounts receive 30 free credits. These are independent practice questions, not official exam questions.
What subjects does the ENEM practice test cover?
Our ENEM mock test covers: Languages & Codes, Human Sciences, Natural Sciences, Mathematics, Essay Writing. You can choose specific subjects or take a comprehensive test across all areas.
Does this reproduce the official ENEM exam?
No. InfinityMock provides multiple-choice practice sets with explanations and progress tracking. Question types, timing, syllabus coverage, and scoring can differ from the official exam. Use your exam body's current syllabus and official practice materials alongside these sets.
How does the AI-powered ENEM mock test work?
Simply select ENEM from our exam list, choose your subject and difficulty level, and our AI instantly generates a custom mock test. After completing the test, you get detailed explanations, performance analytics, and a grade.
Can I retake the ENEM practice test?
Absolutely! You can retake any ENEM mock test as many times as you want. Previously seen questions are always free, so retakes cost no credits. You can also generate completely new questions each time.
What is the best way to prepare for the ENEM?
The most effective strategy is consistent practice with realistic questions. Use InfinityMock to take regular mock tests, review your wrong answers with detailed explanations, track your progress over time, and focus on your weakest subjects. Start with easy difficulty and gradually increase to hard.
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