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Quizzes > Personality & Relationships > Puzzles & Riddles

Discover Your IQ With Our Free Online Quiz

Ready to Test Your Intelligence? Dive into this playful IQ challenge!

Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art style brain puzzle pieces and question marks over open quiz sheet titled IQ challenge on dark blue background

This free IQ test quiz helps you check how you think with quick logic puzzles and real-life mini scenarios. You'll see which skills stand out, get instant feedback on your problem-solving style, and walk away with a score you can practice to beat. For more, try another fast brain quiz .

What number should come next in the sequence? 2, 4, 6, 8, ?
12
8
9
10
Each term in this sequence increases by 2, which is the pattern of even numbers. Starting at 2, adding 2 yields the next number: 2, 4, 6, 8. Following this pattern, 8 + 2 = 10, making 10 the correct next term. This is a basic arithmetic progression with a common difference of two.
What is the next number in the Fibonacci sequence? 1, 1, 2, 3, 5, 8, ?
13
14
11
12
The Fibonacci sequence is defined by each term being the sum of the two preceding terms. It starts with 1, 1, and then continues: 2 (1+1), 3 (1+2), 5 (2+3), 8 (3+5). Therefore, the next term is 5 + 8 = 13. This sequence appears in various natural phenomena such as leaf arrangements and shell spirals.
Cat is to meow as dog is to?
purr
moo
tweet
bark
This is an example of onomatopoeic animal sounds. Cats typically meow, and dogs produce the sound we call a bark. The analogy matches the animal to its characteristic noise. Onomatopoeia is often used to represent sounds in writing.
If Tom is older than Bob, and Bob is older than Sam, who is the youngest?
Sam
Cannot determine
Bob
Tom
This uses a simple transitive relationship: if Tom > Bob and Bob > Sam in age, then Tom > Sam by transitivity. Therefore, Sam is the youngest of the three. This logical deduction relies on comparing ordered relationships. Transitive relations are common in basic logic puzzles.
What is the next perfect square after 25?
49
30
28
36
Perfect squares are the squares of whole numbers. After 25, which is 5 squared, the next is 6 squared, which equals 36. This sequence goes 1, 4, 9, 16, 25, 36, and so on. Recognizing squares helps in many numerical pattern puzzles.
Hot is to cold as day is to?
warm
noon
night
bright
This is an antonym analogy. Hot and cold are opposites, just as day and night are opposites. Such analogies test understanding of word relationships. Recognizing antonyms is a key verbal reasoning skill.
Which number does not belong in the series: 2, 4, 6, 9, 8?
9
6
8
2
All numbers in the series are even except for 9, which is odd. Identifying the odd one out requires spotting parity differences. This type of pattern recognition is common in IQ-style questions. Even and odd classifications are basic arithmetic concepts.
If all Bloops are Razzies and all Razzies are Lazzies, are all Bloops definitely Lazzies?
False
Only sometimes
True
Cannot say
By the transitive property, if every Bloop is a Razzie and every Razzie is a Lazzie, then every Bloop must also be a Lazzie. This is a classic example of a logical syllogism. Understanding such deductive reasoning is essential for many IQ tests.
How many edges does a cube have?
6
8
12
16
A cube has 12 edges: each of its 6 faces is a square with 4 edges, but each edge is shared by 2 faces. Counting shared edges correctly gives 12. Spatial reasoning questions like this appear frequently in IQ tests.
What is the next number in the sequence? 2, 6, 18, 54, ?
162
108
216
180
This sequence multiplies each term by 3 to get the next term: 2×3=6, 6×3=18, 18×3=54. Therefore, 54×3=162. Recognizing multiplicative patterns is key in numerical series puzzles.
Find the next letter: A, C, F, J, O, ?
U
T
V
S
The positions of letters in the alphabet increase by 2, 3, 4, 5, then 6: A(1)+2=C(3), +3=F(6), +4=J(10), +5=O(15), +6=U(21). Thus the next letter is U. Step increments in alphabetical order are common in letter series.
In a simple letter-to-number code where A=1, B=2, …, Z=26, what is the coded value of DOG?
26
24
30
28
In this code, D=4, O=15, G=7. Summing these gives 4+15+7=26. Letter-to-number mappings test basic arithmetic and alphabet knowledge. Such coding puzzles are common in logic assessments.
A mother has four daughters: April, May, June, and what is the fourth daughter's name if the riddle refers to her?
July
Mary
Summer
August
This is a trick riddle where the answer is hidden in the question: "the riddle refers to her" means the fourth daughter is the one asking the riddle - Mary. These lateral thinking puzzles require careful reading.
If all squares are rectangles, are all rectangles squares?
Only sometimes
False
Cannot determine
True
All squares meet the definition of rectangles because they have opposite sides equal and four right angles. However, not all rectangles have all sides equal, so they are not all squares. This tests understanding of set inclusion and geometric definitions.
Which number is next in the sequence? 3, 7, 15, 31, ?
45
57
62
63
Each term in this sequence is the previous term multiplied by 2, then adding 1: 3×2+1=7, 7×2+1=15, 15×2+1=31. Following this, 31×2+1=63. Recognizing this recurrence is key in harder numeric patterns.
Which number is the odd one out? 14, 21, 28, 35, 45
28
35
21
45
All numbers except 45 are divisible by 7 (14, 21, 28, 35). The number 45 does not share this property, making it the outlier. Identifying common factors is a typical medium-level IQ question.
What is the next number in the Fibonacci-based sequence? 3, 5, 8, 13, 21, ?
34
29
31
35
This is the Fibonacci sequence where each term is the sum of the two previous terms. After 21, you add the two preceding numbers: 13 + 21 = 34. Recognizing this pattern is foundational in many advanced IQ tests.
What letter comes next in the abbreviation series for months? J, F, M, A, M, J, J, A, S, O, N, ?
E
M
L
D
These letters are the first letters of the months of the year in order: January through November (J, F, M, A, M, J, J, A, S, O, N). The next month is December, so the letter is D. Recognizing cyclical patterns is key in harder puzzles.
You have three boxes labeled "Apples," "Oranges," and "Apples & Oranges." All labels are wrong. By picking one fruit from a single box, which box do you choose to correctly relabel all three?
Box labeled Oranges
Box labeled Apples & Oranges
Box labeled Apples
Any box
Pick one fruit from the box labeled "Apples & Oranges." Since all labels are wrong, this box cannot contain both. If you draw an apple, for example, it must be the apples-only box. You then use elimination to correct the remaining labels. This classic puzzle tests deduction.
A clock's hour and minute hands overlap approximately every how many minutes?
60
75
65
70
The minute and hour hands coincide roughly 11 times every 12 hours, so the interval is about 65.45 minutes. This comes from dividing 720 minutes by 11 overlaps. Clock angle problems are common in advanced reasoning tests.
A square is to cube as circle is to?
Cylinder
Sphere
Cone
Torus
A cube is the three-dimensional extension of a square. Similarly, a sphere is the 3D extension of a circle. This tests understanding of geometric dimensional analogies.
Solve for x: 2(x - 3) = 4x + 10.
-8
-4
8
4
First expand: 2x - 6 = 4x + 10. Then subtract 4x: -2x - 6 = 10, so -2x = 16 and x = -8. Solving linear equations is a key algebraic skill in IQ tests.
If today is Monday, what day will it be in 100 days?
Tuesday
Thursday
Friday
Wednesday
The days of the week cycle every 7 days. 100 mod 7 = 2, so two days after Monday is Wednesday. Modular arithmetic is useful for calendrical calculations.
Two ducks are in front of a duck, two ducks are behind a duck, and a duck is in the middle. How many ducks are there?
4
5
6
3
With three ducks in a row, the first two are in front of the last duck, the last two are behind the first duck, and the middle duck is in between. This riddle tests spatial reasoning and interpretation of language. Trick puzzles often appear on high-level IQ tests.
Which weighs more: a pound of gold or a pound of feathers?
They weigh the same
Cannot determine
Feathers
Gold
Both quantities are measured as one pound, so they have equal weight. This riddle tests attention to wording and units. Many IQ quizzes include such trick questions to assess careful reading.
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Study Outcomes

  1. Dissect Logic Puzzles -

    Break down classic logic puzzles to understand underlying rules and relationships, improving your analytical skills.

  2. Apply Creative Reasoning -

    Use playful life and relationship scenarios from the quiz to apply lateral thinking techniques and uncover unconventional solutions.

  3. Recognize Patterns -

    Identify numerical and visual patterns within challenge IQ questions to enhance your pattern recognition abilities during the free online IQ test.

  4. Refine Problem-Solving Strategies -

    Evaluate different approaches under simulated time constraints, learning to optimize your tactics for faster and more accurate answers.

  5. Interpret IQ Scores Holistically -

    Go beyond raw numbers by understanding how various question types measure different aspects of intelligence in this playful IQ quiz.

  6. Enhance Critical Thinking -

    Challenge your mind with diverse puzzles that encourage thinking outside the box, boosting your overall cognitive flexibility.

Cheat Sheet

  1. Fluid vs. Crystallized Intelligence -

    Fluid intelligence refers to your capacity for novel problem-solving and logical reasoning, while crystallized intelligence relies on accumulated knowledge and verbal skills (Cattell, 1941). In an IQ test quiz context, fluid tasks might involve pattern completion, whereas crystallized tasks could include vocabulary analogies. Remember the mnemonic "Fluid flows, Crystals store" to distinguish these subtypes quickly.

  2. Logical Reasoning Frameworks -

    Logical puzzles often hinge on deductive structures like "If A then B; A is true, so B must be true" (Modus Ponens). Practice with syllogisms and conditional statements from Stanford's Logic in Computing course to sharpen your reasoning. A simple tip: diagram premises in columns to visualize relationships before jumping to conclusions.

  3. Pattern Recognition Techniques -

    Pattern recognition tasks test your ability to detect regularities in shapes or sequences, a core fluid IQ component (APA). Work with matrix problems, like Raven's Progressive Matrices, starting with 2×2 and 3×3 grids. Use the "spot the change" trick: compare only one feature at a time - shape, number, or orientation - to reduce cognitive load.

  4. Working Memory Training -

    Working memory capacity predicts performance on many IQ test quiz items (Journal of Experimental Psychology, 2014). Exercises like dual n-back or digit-span drills from research repositories (e.g., PNAS) can boost your online quiz scores. Try the "chunking" strategy: group digits or patterns into meaningful units to increase recall efficiency.

  5. Mnemonic Strategies for Problem-Solving -

    Mnemonic systems such as the Method of Loci (place objects along a mental path) can help you remember multi-step logic puzzles or scenario details (University College London Memory Lab). When facing a life-scenario question, assign each key element a familiar location in your home to recall sequentially. The phrase "Home holds the hints" will jog you to use this spatial mnemonic.

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