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Quizzes > General Knowledge & Mixed

Free online IQ test: measure your thinking skills

Quick, free intelligence test to check your thinking. Instant results.

Editorial: Review CompletedCreated By: Szymon RogaczewskiUpdated Aug 27, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art brain and quiz symbols on dark blue background for free Psych Test IQ quiz

Use this quiz to gauge your IQ and see how you handle logic, patterns, and memory. When you finish, keep learning with an instant results iq test, try our free intelligence test, or explore an intelligence test online for a different mix of questions and timing.

What does IQ stand for?
Intelligence Quotient
Intellectual Quality
Intelligence Quality
Intellectual Quotient
IQ is an abbreviation for Intelligence Quotient, a ratio first coined by William Stern in 1912. It is traditionally calculated by dividing mental age by chronological age and multiplying by 100. This metric became widely used to compare cognitive abilities across individuals.
Who developed the first widely used modern intelligence test?
Francis Galton
Lewis Terman
Alfred Binet
David Wechsler
Alfred Binet, along with his colleague Théodore Simon, created the first practical intelligence test in 1905 for French schoolchildren, known as the Binet - Simon scale. This test laid the groundwork for modern IQ testing and was later adapted by psychologists worldwide.
Which scale is commonly used to measure adult intelligence?
Raven's Progressive Matrices
Wechsler Adult Intelligence Scale
Kaufman Assessment Battery
Stanford-Binet Intelligence Scales
The Wechsler Adult Intelligence Scale (WAIS) is among the most widely used tests for assessing adult intelligence. First introduced by David Wechsler in 1955, it measures various cognitive domains including verbal comprehension and perceptual reasoning.
In a normal distribution of IQ scores (mean=100, SD=15), approximately what percentage of people score between 85 and 115?
50%
68%
95%
34%
According to the empirical rule for normal distributions, about 68% of values lie within one standard deviation of the mean. Thus, scores between 85 and 115 on an IQ scale fall within this range.
What distribution do IQ scores typically follow in the population?
Bimodal distribution
Skewed distribution
Uniform distribution
Normal distribution
IQ scores are specifically standardized to fit a bell-shaped or normal distribution. Test developers use large norming samples and statistical techniques to ensure this property for ease of interpretation.
Which IQ score is considered two standard deviations above the mean?
115
120
140
130
With a mean IQ of 100 and a standard deviation of 15, two standard deviations above is calculated as 100 + (2 × 15) = 130. Scores around this level are often classified as very superior.
The Flynn effect refers to which phenomenon?
Decline in test anxiety over generations
Improvement in short-term memory
Increase in emotional intelligence with age
A rise in average IQ scores over time
Named after researcher James R. Flynn, the Flynn effect describes the steady increase in average IQ scores observed in many populations during the 20th century. It is attributed to factors like better nutrition, education, and environmental complexity.
Dog is to Puppy as Cat is to:
Calf
Foal
Pup
Kitten
This analogy matches a young animal to its adult form: a puppy is a young dog, and a kitten is a young cat. Analogical reasoning tests are common in IQ assessments.
Find the next number in the series: 2, 4, 8, 16, __.
30
24
20
32
Each term in this sequence is double the previous one: 2×2=4, 4×2=8, and so on. Therefore, after 16 comes 16×2=32.
Identify the next letter in the sequence: A, C, F, J, O, __.
V
S
U
T
The intervals between letters increase by one each time: A(+2)=C, C(+3)=F, F(+4)=J, J(+5)=O, so O(+6)=U.
Which reasoning type is used in this syllogism: All mammals are warm-blooded. All whales are mammals. Therefore, whales are warm-blooded.
Inductive reasoning
Abductive reasoning
Analogical reasoning
Deductive reasoning
Deductive reasoning starts from general premises to reach a specific conclusion. Here, the general statement about mammals applies to whales as a specific case.
Which subtest primarily measures crystallized intelligence?
Matrix reasoning
Block design
Vocabulary
Digit span
Crystallized intelligence reflects acquired knowledge and verbal skills, often assessed via vocabulary tasks. In contrast, matrix reasoning and block design measure fluid reasoning.
Who proposed the triarchic theory of intelligence?
Charles Spearman
Howard Gardner
Robert Sternberg
Louis Thurstone
Robert Sternberg's triarchic theory divides intelligence into analytical, creative, and practical domains. Gardner is known for his multiple intelligences theory, and Spearman introduced the 'g' factor.
In test theory, reliability refers to:
Difficulty level of the test
Accuracy of what the test measures
Variety of test items
Consistency of test scores
Reliability indicates the degree to which a test consistently measures a construct, producing stable results across administrations or item sets. It differs from validity, which assesses accuracy.
Approximately what percentile rank corresponds to an IQ of 130 in a normal distribution?
75th percentile
98th percentile
95th percentile
84th percentile
An IQ of 130 is two standard deviations above the mean, placing it around the 97.5th to 98th percentile. This means only about 2 - 3% of the population scores higher.
In factor analysis of intelligence, what does the 'g' factor represent?
Emotional intelligence
Physical coordination
Specific skill sets
General intelligence
Spearman's 'g' factor refers to a general cognitive ability that supports performance across diverse tasks. It emerged from correlations between different mental tests.
Raven's Progressive Matrices are designed to assess:
Memory capacity
Numerical computation
Verbal comprehension
Nonverbal abstract reasoning
Raven's Progressive Matrices measure fluid intelligence by presenting abstract patterns that test-takers must complete, without relying on language or arithmetic.
Divergent thinking tasks in IQ tests assess the ability to:
Recognize familiar objects
Reach a single correct answer quickly
Memorize information verbatim
Generate multiple solutions to open-ended problems
Divergent thinking involves creativity and coming up with many possible answers or approaches. It contrasts with convergent thinking, which aims for one correct solution.
Which type of validity evaluates how well a test predicts future performance?
Predictive validity
Construct validity
Face validity
Content validity
Predictive validity assesses the correlation between test scores and future performance on related tasks or criteria. It is crucial for tests used in educational and occupational settings.
A high Cronbach's alpha coefficient indicates:
High test difficulty
High internal consistency among test items
Wide score range
Strong test bias
Cronbach's alpha measures internal consistency reliability, showing how closely related a set of items are within a test. Values closer to 1 indicate better consistency.
Which of the following is NOT a subtest on the Wechsler Adult Intelligence Scale?
Vocabulary
Similarities
Raven's Progressive Matrices
Block Design
Raven's Progressive Matrices is a separate nonverbal reasoning test and not part of the WAIS battery. WAIS subtests include Vocabulary, Block Design, and Similarities, among others.
The phenomenon of improved test scores due to familiarity with the test content is known as:
Observer effect
Placebo effect
Hawthorne effect
Practice effect
The practice effect refers to score improvements resulting from repeated exposure to the same or similar tests, due to increased familiarity rather than true ability gains.
In item response theory, a steep item characteristic curve implies:
Small ability differences greatly affect the probability of a correct response
The item has low reliability
The item does not discriminate between abilities
The item is too easy for all test-takers
A steep item characteristic curve indicates high item discrimination, meaning small changes in examinee ability lead to large changes in the likelihood of answering correctly. This is a key concept in item response theory.
The Flynn effect suggests average IQ scores increase by approximately how many points per decade?
5 points
1 point
3 points
10 points
Research on the Flynn effect estimates gains of about three IQ points per decade in many regions, reflecting changes in education, nutrition, and environment.
The Spearman-Brown prophecy formula is used to estimate:
The validity of a test across cultures
The standard error of measurement
The average score of a population
The reliability of a test after changing its length
The Spearman-Brown formula predicts how the reliability of a test will change when its length is increased or decreased by adding or removing items.
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Study Outcomes

  1. Understand key intelligence theories -

    Understand the core concepts behind the psych test IQ, including logical reasoning and memory models that form the basis of modern intelligence testing.

  2. Analyze reasoning and memory skills -

    Analyze your logical thinking and memory capabilities through our interactive online intelligence quiz tailored to measure mental agility.

  3. Evaluate IQ test performance -

    Evaluate your IQ test online free results to identify cognitive strengths and areas for improvement, with immediate feedback for each section.

  4. Apply problem-solving techniques -

    Apply effective problem-solving strategies to test your IQ across various question formats, improving your accuracy and speed.

  5. Interpret score insights -

    Interpret detailed insights from your psych test IQ results, understanding what your score reveals about your cognitive profile.

  6. Compare against psychometric standards -

    Compare your performance with established psychological intelligence test norms to see where your IQ stands relative to others.

  7. Engage with a free interactive quiz -

    Engage with a fun and informative IQ test online free that makes assessing your intelligence both entertaining and educational.

Cheat Sheet

  1. Spearman's g Factor -

    Charles Spearman introduced the general intelligence factor (g) to explain why performance on various cognitive tasks tends to correlate. Researchers use factor analysis (e.g., correlating math and verbal scores) to isolate g from specific skills. Mnemonic trick: think "g" for "general" to recall the common thread in all subtests.

  2. IQ Score Calculation -

    The classic IQ formula is (Mental Age ÷ Chronological Age) × 100, as seen in early Stanford-Binet scales. For example, a 12-year-old with a mental age of 15 would score (15/12)×100 = 125. Modern tests adjust norms rather than age ratios, but understanding the original formula helps when you test your IQ across different formats.

  3. Wechsler Verbal and Performance Scales -

    David Wechsler's scales divide intelligence into Verbal IQ and Performance IQ to capture both language-based and nonverbal skills. Subtests include Vocabulary and Similarities for verbal reasoning, plus Block Design and Matrix Reasoning for visual-spatial problem solving. Reviewing sample items from a psychology intelligence test site can boost familiarity with each subscale.

  4. Fluid vs. Crystallized Intelligence -

    Raymond Cattell's model distinguishes fluid intelligence (novel problem solving) from crystallized intelligence (accumulated knowledge). Fluid tasks might include pattern puzzles under time pressure, while crystallized tasks involve vocabulary or general facts. Recognizing which type you're using helps you focus practice - solve new IQ puzzles for fluid gains and read or review facts for crystallized growth.

  5. Test-Taking Strategies and Practice -

    When you take a psych test IQ or an online intelligence quiz, time management and strategic guessing are key. Use an "E.L.I.M." mnemonic: Eliminate wrong options, Label confidence levels, Invest time wisely, Move on quickly if stuck. Regular use of an IQ test online free platform will sharpen your pacing and increase your score when you test your IQ under timed conditions.

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