Mensa IQ Spatial and Abstract Reasoning Questions and Answers Flashcards

Find the missing number: 3, 9, 7, 13, 11, 17, 15, ?

Answer: 21

The sequence alternates +6 and −2: 15 + 6 = 21.

If you look at a transparent clock from behind, what time does it display if the clock face shows 2:30?

Answer: 9:30

Mirroring a clock horizontally maps 2 to 10; the reflected time is 9:30.

A grid has rows labeled 1–4 (top to bottom) and columns A–D (left to right). A pattern of shaded cells appears at (1,A), (2,B), (3,C). Which cell logically continues the diagonal?

Answer: (4,D)

The diagonal moves one row down and one column right each step, landing at row 4, column D.

How many triangles are in a figure of a large triangle divided by lines connecting midpoints of each side?

Answer: 4

Connecting midpoints creates 4 congruent triangles inside the original.

Which of these letter codes follows the same transformation rule? AB → YZ, CD → WX, then EF → ?

Answer: UV

Each pair is mapped to its mirror pair from the end of the alphabet: EF maps to UV.

A water tank is 1/3 full. After adding 20 liters, it is 1/2 full. What is the total capacity of the tank?

Answer: 120 L

The difference (1/2 − 1/3) = 1/6 of capacity equals 20 L, so total capacity = 120 L.

What comes next in the spatial rotation sequence: shape rotated 45°, 90°, 135°, 180°, ?

Answer: 225°

The sequence increases by 45° each step: 180° + 45° = 225°.