25 IQ Questions and Answers 2026: Test Your Intelligence with Answers

25 IQ Questions and Answers 2026

Test Your Intelligence

Can you solve these 25 IQ questions without looking at the answers? This collection includes number series, logical reasoning, patterns, coding-decoding, mathematical puzzles, and tricky brain teasers. Try all the questions first and then check your score.

What Are IQ Questions?

IQ questions are designed to test different types of thinking skills, including logical reasoning, numerical ability, pattern recognition, problem-solving, observation, and analytical thinking.

These questions are useful for students and candidates preparing for competitive exams, aptitude tests, placement tests, interviews, and general reasoning practice.

25 IQ Questions and Answers

Question 1: Number Series

Find the next number: 2, 6, 12, 20, 30, ?

A) 36
B) 40
C) 42
D) 44

Answer: C) 42

Explanation: The differences are:

2 → 6 = +4
6 → 12 = +6
12 → 20 = +8
20 → 30 = +10

The next difference is +12. Therefore: 30 + 12 = 42

Question 2: Find the Odd One Out

Which number does not belong to the group?

16, 25, 36, 49, 63, 81

A) 25
B) 36
C) 63
D) 81

Answer: C) 63

Explanation: 16, 25, 36, 49 and 81 are perfect squares: 4², 5², 6², 7² and 9². But 63 is not a perfect square.

Question 3: Number Pattern

Find the missing number: 3, 9, 27, 81, ?

A) 162
B) 216
C) 243
D) 324

Answer: C) 243

Explanation: Each number is multiplied by 3:

3 × 3 = 9
9 × 3 = 27
27 × 3 = 81
81 × 3 = 243

Question 4: Logical Reasoning

If all roses are flowers and some flowers are red, which statement is definitely true?

A) All roses are red
B) Some roses are red
C) All roses are flowers
D) No roses are red

Answer: C) All roses are flowers

Explanation: The first statement directly tells us that all roses belong to the category of flowers. We cannot conclude that roses are necessarily red.

Question 5: Age Puzzle

A father is 30 years older than his son. After 5 years, the father will be twice as old as his son. What is the son's present age?

A) 20 years
B) 25 years
C) 30 years
D) 35 years

Answer: B) 25 years

Explanation: Let the son's age = x. Father's age = x + 30. After 5 years: Son = x + 5 Father = x + 35

According to the question:

• x + 35 = 2(x + 5)
• x + 35 = 2x + 10
• x = 25

So, the son is currently 25 years old.

Question 6: Coding-Decoding

If CAT = DBU, then what is DOG?

A) EPH
B) EOG
C) FPH
D) DPH

Answer: A) EPH

Explanation: Each letter moves one step forward:

C → D
A → B
T → U

Similarly:

D → E
O → P
G → H

Therefore, DOG = EPH.

Question 7: Clock Question

What is the angle between the hour hand and minute hand at exactly 3:00?

A) 30°
B) 60°
C) 90°
D) 120°

Answer: C) 90°

Explanation: At 3:00, the minute hand is at 12 and the hour hand is at 3. The angle between them is 90°.

Question 8: Missing Number

4, 8, 16, 32, ?

A) 48
B) 56
C) 64
D) 72

Answer: C) 64

Explanation: Every number is multiplied by 2:

4 × 2 = 8
8 × 2 = 16
16 × 2 = 32
32 × 2 = 64

Question 9: Direction Test

Rahul walks 5 km north, then turns right and walks 3 km. In which direction is he from his starting point?

A) North-West
B) North-East
C) South-East
D) South-West

Answer: B) North-East

Explanation: He first moves north and then turns right, which means he moves east. Therefore, his final position is North-East of the starting point.

Question 10: Find the Missing Number

1, 4, 9, 16, 25, ?

A) 30
B) 32
C) 36
D) 49

Answer: C) 36

Explanation: These are consecutive square numbers:

1² = 1
2² = 4
3² = 9
4² = 16
5² = 25
6² = 36

Question 11: Family Relationship

Pointing to a man, Ravi said: "He is the son of my mother's only son." How is the man related to Ravi?

A) Brother
B) Father
C) Son
D) Uncle

Answer: C) Son

Explanation: Ravi's mother's only son = Ravi himself. Therefore, the man is the son of Ravi.

Question 12: Odd One Out

Which one is different?

A) Apple
B) Mango
C) Potato
D) Banana

Answer: C) Potato

Explanation: Apple, mango and banana are commonly classified as fruits, while potato is a vegetable/tuber.

Question 13: Number Series

Find the missing number: 5, 10, 20, 40, 80, ?

A) 100
B) 120
C) 140
D) 160

Answer: D) 160

Explanation: Each number is multiplied by 2. 80 × 2 = 160

Question 14: Logical Puzzle

A farmer has 10 sheep. All but 3 run away. How many sheep are left?

A) 3
B) 7
C) 10
D) 0

Answer: A) 3

Explanation: "All but 3" means everything except 3 ran away. So, 3 sheep remain.

Question 15: Alphabet Test

What comes next? A, C, F, J, O, ?

A) T
B) U
C) V
D) W

Answer: B) U

Explanation: The gaps increase by one:

A → C = +2
C → F = +3
F → J = +4
J → O = +5

Next: O + 6 = U

Difficult IQ Questions

Now let's increase the difficulty level.

Question 16: Number Puzzle

If:

2 + 3 = 10
3 + 4 = 21
4 + 5 = 36

Then:

5 + 6 = ?

A) 45
B) 50
C) 55
D) 60

Answer: C) 55

Explanation:

The pattern is:

2 × (2 + 3) = 10
3 × (3 + 4) = 21
4 × (4 + 5) = 36

Therefore: 5 × (5 + 6) = 5 × 11 = 55

Question 17: Find the Missing Number

2, 5, 11, 23, 47, ?

A) 91
B) 93
C) 95
D) 97

Answer: C) 95

Explanation: Each number is: ×2 + 1

2 × 2 + 1 = 5
5 × 2 + 1 = 11
11 × 2 + 1 = 23
23 × 2 + 1 = 47

Therefore: 47 × 2 + 1 = 95

Question 18: Seating Logic

Five people — A, B, C, D and E — are standing in a line.

A is taller than B.
B is taller than C.
D is taller than A.
E is shorter than C.

Who is the tallest?

A) A
B) B
C) C
D) D

Answer: D) D

Explanation: We know: D > A > B > C > E Therefore, D is the tallest.

Question 19: Mathematical IQ

A number is multiplied by 4 and then 8 is added. The result is 40. What is the number?

A) 6
B) 7
C) 8
D) 9

Answer: C) 8

Explanation: Let the number be x. 4x + 8 = 40 4x = 32 x = 8

Question 20: Brain Teaser

A man has 4 daughters. Each daughter has one brother. How many children does the man have?

A) 4
B) 5
C) 8
D) 9

Answer: B) 5

Explanation: The four daughters can all have the same brother. Therefore: 4 daughters + 1 brother = 5 children.

Very Tricky IQ Questions

What number should replace the question mark? 1, 1, 2, 3, 5, 8, ?

A) 11
B) 12
C) 13
D) 15

Answer: C) 13

Explanation: Each number is the sum of the previous two:

1 + 1 = 2
1 + 2 = 3
2 + 3 = 5
3 + 5 = 8
5 + 8 = 13

This is the famous Fibonacci sequence.

If BOOK is coded as CPPL, how is PEN coded?

A) QFO
B) QEN
C) PFO
D) RFO

Answer: A) QFO

Explanation: Each letter moves one position forward:

P → Q
E → F
N → O

Therefore: PEN → QFO

A bat and a ball together cost ₹110. The bat costs ₹100 more than the ball. What is the cost of the ball?

A) ₹5
B) ₹10
C) ₹15
D) ₹20

Answer: A) ₹5

Explanation:

• Ball = ₹5
• Bat = ₹105
• Total = ₹105 + ₹5 = ₹110

The common quick answer of ₹10 is incorrect because then the bat would cost ₹110 and the total would become ₹120.

Question 24: Which number comes next?

10, 17, 26, 37, 50, ?

A) 61
B) 63
C) 65
D) 67

Answer: C) 65

Explanation:

Differences:

17 − 10 = 7
26 − 17 = 9
37 − 26 = 11
50 − 37 = 13

The differences increase by 2.

• Next difference = 15
• 50 + 15 = 65

Question 25: The Final Challenge

A clock shows 6:00. What is the angle between the hour hand and minute hand?

A) 90°
B) 120°
C) 150°
D) 180°

Answer: D) 180°

Explanation: At exactly 6:00, the minute hand points at 12 and the hour hand points at 6. They are opposite each other. Therefore, the angle is 180°.

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