Logic Quiz – Printable Version
20 multiple-choice questions with an explained answer key, ready to print.
Print the sheet (or save it as a PDF from the print window), hand it out, then mark it together using the answer page: every answer is explained. Perfect for a party, a birthday, a classroom, a care home or a team activity.
Name: ………………………………Score: ……… / 20
- There are 10 people in a room. Each shakes hands with every other person exactly once. How many handshakes take place in total?
- A. 90
- B. 100
- C. 45
- D. 110
- Find the next term: 2, 6, 24, 120...
- A. 680
- B. 720
- C. 340
- D. 1020
- The water level in a tank doubles every day. It takes 60 days to fill it. When is it half full?
- A. 59
- B. 40
- C. 49
- D. 30
- Which grid completes the series?
- A. A
- B. B
- C. C
- D. D
- A father has 4 sons. Each son has one sister. How many children does the father have in total?
- A. 9
- B. 5
- C. 8
- D. 4
- A train leaves Paris at 8:00 am at 120 km/h. At the same moment, another leaves Lyon (500 km away) at 80 km/h. How far from Paris do they meet?
- A. 260 km
- B. 280 km
- C. 240 km
- D. 300 km
- A man lives on the 15th floor. Every morning he takes the lift to the ground floor. In the evening he takes the lift to the 7th floor and walks up to the 15th. Why?
- A. The lift breaks down in the evening
- B. He is saving energy
- C. He can't reach the button for the 15th
- D. He likes walking
- The more you take of me, the more you leave behind. What am I?
- A. A shadow
- B. A fingerprint
- C. A photograph
- D. A footprint
- I am always hungry and must always be fed. Give me a drink and I die. What am I?
- A. A plant
- B. A vampire
- C. An animal
- D. Fire
- I am always moving, yet I never go anywhere. What am I?
- A. The wind
- B. A river
- C. A clock
- D. A shadow
- One source brings me into being. Two sources split me in two. Surrounded by sources on every side, I cease to exist. What am I?
- A. Your shadow
- B. Your footprint
- C. Your echo
- D. Your reflection
- I am always in the middle of the water, yet I am never wet. What am I?
- A. An island
- B. A reflection
- C. The sun
- D. A fish
- A cube painted entirely red is cut into 27 identical small cubes (3x3x3), how many small cubes have exactly two painted faces?
- A. 6
- B. 12
- C. 8
- D. 4
- In a race, you overtake the runner in second place. What position are you in now?
- A. First
- B. Last
- C. Third
- D. Second
- How many saw cuts are needed in a log to obtain 5 pieces?
- A. 4
- B. 5
- C. 6
- D. 3
- How many diagonals does an octagon (an 8-sided polygon) have?
- A. 16
- B. 24
- C. 28
- D. 20
- A clock strikes 6 times in 5 seconds at regular intervals. How long does it take to strike 12 times?
- A. 10 seconds
- B. 11 seconds
- C. 12 seconds
- D. 15 seconds
- A man owns 17 camels and wants to leave 1/2 to his eldest son, 1/3 to the second and 1/9 to the third, without dividing a camel. What temporary total makes the division work before the extra camel is returned?
- A. 18
- B. 19
- C. 20
- D. 21
- In the Monty Hall problem, you choose one of three doors. The host knows the prize location, always opens another losing door, then offers you a switch. Which strategy maximises your chance?
- A. Switch doors
- B. Stay with your door
- C. Flip a coin
- D. Both strategies give exactly 1/2
- Three suspects A, B and C each make a statement. Exactly one statement is true. A: “B is guilty.” B: “C is guilty.” C: “B is lying.” If exactly one suspect is guilty, who is it?
- A. A
- B. B
- C. C
- D. Impossible to determine
Answer key — Logic Quiz
- C. 45Each handshake involves two people. Multiplying 10 x 9 = 90 counts each handshake twice, so divide by 2: 10x9/2 = 45.
- B. 720Each number is obtained by multiplying the previous one by an integer that grows by 1 each time (x3, x4, x5, then x6): 120 x 6 = 720.
- A. 59On day 59, since the level doubles between day 59 and day 60.
- B. BOn the first row, the black square shifts by 1 from one grid to the next; on the second row it shifts by 2, and so on.
- B. 5The 4 sons all share the same sister. So there are 4 boys + 1 girl = 5 children.
- D. 300 kmThe two trains close the 500 km gap at a combined 200 km/h, so they meet after 2.5 hours.
- C. He can't reach the button for the 15thThe man is short (or uses a wheelchair). Going down he can reach the ground-floor button, but going up he can only reach the button for the 7th floor — unless it is raining and he has an umbrella to press higher!
- B. A fingerprintThe more fingerprints you take, the more you leave behind.
- D. FireFire needs 'food' (wood, paper) and dies when you pour water on it.
- B. A riverA river is always in motion, yet it never leaves its place.
- A. Your shadowTwo lamps cast two distinct shadows of the same body. And if light comes from every direction at once, no area is left without rays: the shadow vanishes.
- A. An islandAn island is surrounded by water but never gets wet.
- B. 12The cubes with two painted faces are those in the middle of each edge.
- D. SecondBy overtaking the runner in second, you take their place: you are second, not first.
- A. 4Each cut adds one piece. To go from 1 piece to 5, you need 4 cuts.
- D. 20The formula is n x (n - 3) / 2. Here: 8 x 5 / 2 = 20.
- B. 11 secondsSix strikes contain five intervals, so each interval lasts one second.
- A. 18Borrowing an 18th camel gives 9 + 6 + 2 = 17, leaving the borrowed camel to be returned.
- A. Switch doorsYour initial choice wins with probability 1/3. The remaining 2/3 probability effectively transfers to the only other unopened door after the host deliberately reveals a loser.
- C. CIf C is guilty, B's accusation is true, A's is false, and C's claim that B is lying is false: exactly one true statement.