Mensa Mensa IQ Odd One Out Puzzles 5

Question 1

Which does NOT belong? Quartz, Obsidian, Granite, Diamond

Accepted Answer

Obsidian

Answer

Quartz, Granite, and Diamond are all crystalline minerals or rocks with an ordered atomic structure, while Obsidian is a volcanic glass with a non-crystalline (amorphous) structure.

Question 2

Which number is the odd one out? 16, 25, 36, 48, 64

Accepted Answer

48

Answer

16, 25, 36, and 64 are all perfect squares (4², 5², 6², 8²), but 48 is not a perfect square.

Question 3

Which word does NOT belong? Stalagmite, Stalactite, Speleothem, Stalwart

Accepted Answer

Stalwart

Answer

Stalagmite, Stalactite, and Speleothem are all geological formations found in caves, while Stalwart means loyal and hardworking and has no geological meaning.

Question 4

Which instrument is the odd one out? Violin, Cello, Harp, Viola

Accepted Answer

Harp

Answer

Violin, Cello, and Viola are all bowed string instruments belonging to the viol family, while Harp is a plucked string instrument of a different family.

Question 5

Which sequence is the odd one out? 2-4-8, 3-6-12, 5-10-20, 4-8-13

Accepted Answer

4-8-13

Answer

In 2-4-8, 3-6-12, and 5-10-20 each term doubles the previous one (×2), but in 4-8-13 the third term adds 5 instead of doubling.

Mensa Practice Test

Mensa Practice Test

Mensa Mensa IQ Odd One Out Puzzles 5