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Quizzes > General Knowledge & Mixed

Smart Brain Test: Quick IQ and Logic Puzzles

Quick, free IQ brain test with logic puzzles. Instant results.

Editorial: Review CompletedCreated By: Venkatesh GaarlapatiUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art brain puzzle pieces, lightbulb icons floating over quiz questions on golden yellow background

This smart brain test helps you check logic and IQ through quick, tricky puzzles. For more challenge, try our free online iq test, compare scores on an instant results iq test, or push yourself with a brainiac iq test. Take a few minutes, see where you shine, and build sharper problem-solving skills.

What is the next number in the sequence: 2, 4, 6, 8, ?
10
16
14
12
This is a sequence of even numbers starting at 2 and increasing by 2 each time. The next even number after 8 is 10. Recognizing simple arithmetic progressions helps build foundational pattern recognition skills. For more on even numbers, see .
Dog is to puppy as cat is to?
Calf
Cub
Foal
Kitten
This question tests analogical reasoning by matching an adult animal to its young. A puppy is a young dog, and a kitten is a young cat. Identifying these relationships is a common verbal IQ task. Learn more about analogies at .
If x + y = 10 and x - y = 2, what is the value of x?
6
2
8
4
Solving the system: adding the two equations gives 2x = 12, so x = 6. Substituting back confirms y = 4. This tests basic algebraic manipulation and logical deduction. See more on linear equations at .
What number comes next in the Fibonacci sequence: 1, 1, 2, 3, 5, 8, 13, ?
20
21
18
15
Each Fibonacci number is the sum of the two preceding numbers: 8 + 13 = 21. Recognizing recursive sequences is key in pattern-based IQ questions. The Fibonacci sequence appears in many natural phenomena as well. For details, visit .
Find the missing number in the sequence: 2, 5, 10, 17, 26, ?
34
36
35
37
Differences between terms are 3, 5, 7, 9, so the next difference is 11. Adding 11 to 26 gives 37. Spotting patterns in differences is a common numerical reasoning skill. More on numeric sequences at .
All mammals are warm-blooded. All whales are mammals. Are all whales warm-blooded?
No
Only some
Yes
Cannot say
This is a basic syllogism: since all whales belong to the category of mammals, and all mammals are warm-blooded, whales must be warm-blooded. Syllogistic logic tests categorical reasoning. For more on syllogisms, see .
On an island of knights and knaves, a resident says "I am a knave." What is the resident?
Knave
Liar
Knight
Visitor
Knights always tell the truth and knaves always lie. If the speaker were a knight, he couldn't truthfully say he was a knave. Therefore he must be a knave lying about his identity. Learn more about these puzzles at .
What is the next number in the sequence: 3, 6, 18, 72, ?
288
432
504
360
Each term is multiplied by an increasing integer: 3×2=6, 6×3=18, 18×4=72, then 72×5=360. Recognizing a changing multiplier tests more advanced pattern skills. Further examples of such sequences are available at .
If a = 2, b = 3, and c = 4, what is the value of (a^b) mod c?
0
1
4
2
First compute a^b = 2^3 = 8. Then 8 mod 4 equals the remainder when 8 is divided by 4, which is 0. This question tests understanding of exponents and modular arithmetic. Read more at .
If the statement "If p then q" is true, and "not q" is true, what can be logically inferred about p?
p is false
Cannot determine
p is true
p is sometimes true
This is an example of modus tollens: from 'if p then q' and 'not q', you can deduce 'not p'. It's a fundamental rule in propositional logic. Mastery of these inferences is critical for high-level logical reasoning. More on modus tollens at .
0
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Study Outcomes

  1. Assess Logical Reasoning -

    Sharpen pattern recognition and deduction skills by tackling brain teasers in our smart brain game.

  2. Measure IQ Performance -

    Use this free brain quiz to gauge your intelligence level against average scores and interpret your IQ test results.

  3. Enhance Problem-Solving Skills -

    Develop effective strategies for approaching puzzles and logic questions to level up your problem-solving toolkit.

  4. Identify Cognitive Strengths -

    Pinpoint your strongest intelligence domains and leverage them when facing new challenges in tests or real”world scenarios.

  5. Boost Mental Agility -

    Improve quick-thinking abilities under time constraints, enhancing your performance in fast-paced brain teaser rounds.

  6. Apply Critical Thinking -

    Transfer logical insights from the quiz to everyday situations, making more reasoned and informed decisions.

Cheat Sheet

  1. Pattern Recognition Strategies -

    Developing your pattern recognition is key to excelling in a smart brain game or brain quiz; practice with matrix puzzles like Raven's Progressive Matrices (Journal of Experimental Psychology: Applied, 2018). Break down visual sequences into shapes or numerical increments to spot the rule faster - e.g., identify that each row adds two more dots. Consistent daily drills improve neural connections that underlie top-tier IQ test performance.

  2. Logical Deduction Techniques -

    Logical reasoning underpins many brain teasers and intelligence tests, so learn to structure arguments using truth tables and Venn diagrams (American Psychological Association, 2020). For example, map premises "All A are B" and "Some B are C" to see which conclusions must follow. Building this habit reduces errors when answering complex syllogisms in timed quizzes.

  3. Core Mathematical & Verbal Aptitude Formulas -

    Memorize foundational formulas like IQ = 100 × (mental age ÷ chronological age) and revisit algebraic shortcuts such as completing the square or using the quadratic formula (x = [ - b±√(b² - 4ac)]/2a). Combine this with vocabulary-building techniques from the GRE Verbal Reasoning syllabus to boost both quantitative and verbal scores. Cross-reference with open courseware from MIT or Stanford to ensure accuracy.

  4. Memory & Mnemonic Devices -

    Leverage mnemonics to lock in critical facts: use "PEMDAS" for order of operations (Parentheses, Exponents, Multiplication, Division, Addition, Subtraction) or "Roy G. Biv" for the spectrum of light (research from the Journal of Cognitive Enhancement, 2019). Chunking information into 5 - 9 item groups also aligns with Miller's Law for working memory limits. These tricks speed recall during high-pressure brain teaser rounds.

  5. Time Management & Cognitive Load -

    Applying the Pomodoro Technique (25-minute focused bursts with 5-minute breaks) helps maintain peak mental agility in IQ tests and smart brain quizzes (European Journal of Applied Psychology, 2021). Prioritize easier questions first to build confidence and free working memory for tougher problems. Monitoring stress levels with brief mindfulness exercises preserves cognitive resources when tackling advanced logic puzzles.

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