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Quizzes > Science

Mensa IQ Test Practice: Free IQ Test Online

Quick, free online IQ practice test. Instant results.

Editorial: Review CompletedCreated By: Lynne WilsonUpdated Aug 28, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art brain made of puzzle pieces above quiz title on coral background with IQ scale markers.

This quiz helps you practice for a Mensa-style IQ test and understand what common scores mean. Try a few timed questions and get simple feedback, then explore more with our free online iq test, the instant results iq test, or a tougher high iq test.

What is considered the average IQ score in most standardized IQ tests?
115
100
90
85
The average IQ score is defined as 100 because test creators norm the results to center around this point. During standardization, raw scores are converted so that the mean equals 100. This method maintains consistency across different test forms and populations.
Which distribution shape do IQ scores typically follow?
Uniform distribution
Normal distribution
Exponential distribution
Bimodal distribution
IQ scores are designed to follow a normal distribution (bell curve) because of the central limit theorem. This shape ensures that most scores cluster around the mean. It allows for predictable percentages within each standard deviation.
In IQ testing, what does the term "standard deviation" usually refer to?
5 points
20 points
10 points
15 points
Standard deviation in IQ testing refers to how spread out scores are around the mean. Most modern IQ tests use a standard deviation of 15 to interpret score differences. This value ensures meaningful distinctions between score ranges on the bell curve.
IQ tests are primarily designed to measure which of the following?
Emotional intelligence
Physical fitness
Cognitive abilities
Social skills
IQ tests primarily measure cognitive abilities such as reasoning, problem-solving, and memory. They are not designed to directly assess emotional intelligence, physical fitness, or social skills. This focus has made IQ a key metric in psychological and educational assessment.
Approximately what percentage of the population falls within one standard deviation of the mean IQ (between 85 and 115)?
95%
50%
75%
68%
In a normal distribution, approximately 68% of the population falls within one standard deviation of the mean on either side. For IQ scores with mean 100 and SD 15, that range is 85 to 115. This property is known as the 68-95-99.7 rule.
What IQ score is typically considered the threshold for "gifted" classification?
115
125
140
130
An IQ score of 130 is commonly used as the threshold for gifted classification because it lies two standard deviations above the mean. This cutoff identifies roughly the top 2.5% of the population. Different organizations may adjust this threshold, but 130 remains standard in many assessments.
Which psychologist developed the first standardized test of intelligence?
Alfred Binet
Lewis Terman
David Wechsler
Charles Spearman
Alfred Binet, along with Théodore Simon, developed the first practical intelligence test in the early 20th century. They aimed to identify students needing educational assistance. Later adaptations by researchers like Lewis Terman expanded Binet's work into the Stanford-Binet test.
The term "IQ" originally stands for?
Intelligent Quality
Intensity Quotient
Innate Quotient
Intelligence Quotient
IQ stands for Intelligence Quotient, a term introduced by German psychologist William Stern in 1912. It originally referred to the ratio of mental age to chronological age multiplied by 100. The acronym has become the standard label for quantifying cognitive performance.
In William Stern's original IQ formula, which variable represents the tester's performance age?
Raw score
Z-score
Mental age
Chronological age
William Stern defined IQ as the ratio of mental age to chronological age multiplied by 100, where mental age reflects performance level. Mental age was determined by comparing test results to the average performance at different ages. This approach was later replaced by deviation IQ but laid the groundwork for modern assessments.
Which of the following is NOT a core subtest in the Wechsler Adult Intelligence Scale (WAIS)?
Block Design
Vocabulary
Digit Span
Analogies
The WAIS core subtests include Vocabulary, Digit Span, Block Design, and others across multiple indexes. Analogies is not one of the core WAIS subtests, though similar tasks appear under different names. This selection ensures a broad measure of verbal and performance skills.
A person scoring 70 on a standardized IQ test would most likely be categorized as having which classification?
Average intelligence
Gifted
High average intelligence
Intellectual disability
An IQ of 70 falls approximately two standard deviations below the mean, indicating potential intellectual disability. This classification often corresponds to challenges in adaptive functioning. Diagnostic guidelines use a similar threshold to identify cases requiring support services.
In a standard IQ scale with a mean of 100 and a standard deviation of 15, an IQ of 115 corresponds approximately to which percentile rank?
95th percentile
50th percentile
84th percentile
68th percentile
An IQ score of 115 is one standard deviation above the mean in a normal distribution. Approximately 84.13% of scores lie below this point, placing it around the 84th percentile. Percentile ranks help compare individual scores to the broader population.
In Spearman's theory of intelligence, what does the 'g factor' represent?
Grouped intelligence
General intelligence factor
Genetic intelligence
Growth factor
Spearman's g factor represents a general intelligence component underlying performance across diverse cognitive tasks. He proposed that this 'general intelligence' contributes to success in intellectually demanding activities. The concept remains influential in theories of intelligence and psychometrics.
In item response theory (IRT), the three-parameter logistic model includes 'a' for discrimination and 'b' for difficulty. What does the third parameter 'c' represent?
Time
Speed
Bias
Guessing
In the three-parameter logistic IRT model, 'c' represents the probability of guessing the item correctly. 'a' measures item discrimination and 'b' indicates difficulty, while 'c' accounts for slip or random correct responses. Including guessing improves model accuracy for multiple-choice formats.
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Study Outcomes

  1. Understand average IQ fundamentals -

    Grasp the definition of "what is average IQ" and learn the typical IQ score range that represents an average IQ score in the general population.

  2. Identify IQ score categories -

    Recognize and differentiate between key IQ score categories, from below average and average to gifted and genius levels.

  3. Interpret specific IQ values -

    Learn what an IQ of 145 means compared to the norm and understand how higher IQ scores relate to gifted categories.

  4. Analyze quiz questions -

    Engage with a variety of question types that test your knowledge of IQ level definitions and benchmarks.

  5. Evaluate your IQ knowledge -

    Use the free IQ quiz to assess your understanding of IQ concepts and see where you stand.

  6. Compare personal scores to benchmarks -

    Discover how your quiz results measure up against average IQ score ranges and gifted thresholds.

Cheat Sheet

  1. Wechsler Scale and IQ Formula -

    The Wechsler Adult Intelligence Scale (WAIS) sets the average IQ at 100 with a standard deviation of 15, using the formula IQ = 100 + 15·Z. Mnemonic: "Mean of 100, ±15" helps you recall the core structure of most modern IQ tests. This standardization ensures consistency across diverse populations (source: American Psychological Association).

  2. IQ Score Categories and Percentiles -

    To answer "what is average IQ?" remember that an average IQ score ranges from 85 to 115, capturing about 68% of test-takers. Categories include borderline (70 - 84), average (85 - 114), high average (115 - 129), and gifted (130+), with percentiles aligning to these bands (source: APA).

  3. Interpreting an IQ of 145 -

    An IQ of 145 places you above the 99.7th percentile, often classified as "highly gifted" and well above the Mensa cutoff of approximately 130. This means exceptional problem-solving skills and reasoning ability compared to the general population (source: Mensa International).

  4. Reliability and Validity of IQ Tests -

    Modern IQ assessments demonstrate test - retest reliability coefficients above 0.9 and strong validity through correlations with academic and occupational success (r ≈ 0.5 - 0.8). These psychometric properties ensure that IQ scores meaningfully reflect cognitive ability (source: Journal of Educational Psychology).

  5. Preparing for a Free IQ Quiz -

    Practice verbal analogies, pattern recognition, and arithmetic puzzles under timed conditions to boost familiarity and speed. Use free IQ quiz platforms (e.g., OpenPsychometrics.org) and follow the mnemonic "FAST" (Familiarize, Apply strategies, Speed practice, Test review) to maximize your score.

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