# Disk colour riddle

804.8K Views

Imagine a disk spinning like a record player turn table. Half of the disk is black and the other is white. Assume you have an unlimited number of colour sensors. How many sensors would you have to place around the disk to determine the direction the disk is spinning? Where would they be placed?

You only need two and they should NOT be placed at opposite sides.

### Your Answer

## More puzzles to try-

### A Farmer, a Wolf, A Goat, and a Cabbage

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the ...Read More »### Five Friends Surnames Puzzle

Five friends with surname Batliwala, Pocketwala, Talawala, Chunawala and Natakwala have their first name and middle name as follow- 1. Four ...Read More »### What is the chance of flipping heads again?

You have three coins. One always comes up heads, one always comes up tails, and one is just a regular ...Read More »### How many sons riddle

I have ten or more sons. I have less than ten sons. I have at least one son. If only ...Read More »### Move six matchsticks to make 5 squares

In the given figure you have to move six matchsticks such that the resulting figure has five squares. Move it, ...Read More »### Gold Bar Puzzle

You’ve got someone working for you for seven days and a gold bar to pay him. The gold bar is ...Read More »### Which switch belongs to which light bulb?

There are 4 light bulbs in a room and 4 switches corresponding to these four light bulbs (in a random ...Read More »### Boating in the River

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these ...Read More »### Magic Squares

There are four sticks of length ‘a’ and four more sticks of length ‘b’. The length of ‘b’ is exactly ...Read More »### Dollar and Cent riddle

A confused bank teller transposed the dollars and cents when he cashed a cheque for Ms Denial, giving her dollars ...Read More »### Lost Brother riddle

A man is able to contact his long lost brother who has never met. They agree to meet. When the ...Read More »### Good for bald head

What is good for your bald head?Read More »### Somthing is common riddle

What do the numbers 11, 69, 88, and 96 all have in common?Read More »### Doughnut Distribution

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you ...Read More »### The last thing you take off before bed

What is the last thing you take off before bed?Read More »### Can you connect them with four straight lines without lifting pen from a paper?

There are nine points as shown in the picture above. Can you connect them with four straight lines without lifting ...Read More »### Reasoning on Matching Definitions

An Informal Gathering occurs when a group of people get together in a casual, relaxed manner. Which situation below is ...Read More »### What is the probability that it was a penny?

Mary had a coin purse with fifty coins, totaling exactly $1.00. Unfortunately, while counting her change, she dropped one coin. ...Read More »### I Always Lie

I am lying and I always lie. Tell me whether I am lying or telling the truth.Read More »### Toy of queen riddle

Toy of queen, Tool of thief. Always used to be unseen. Sign of Sorrow and joy. Giving all likeness borrowed. ...Read More »

Accenture Interview PuzzlesAdobe Interview PuzzlesAge RiddleAkbar Birbal PuzzlesAlgorithm PuzzlesAlphabet riddleAmazon Interview PuzzlesAnalytical MathematicsAptitude PuzzleBank PuzzlesBetting PuzzlesBrain TeasersCalendar PuzzlesCards PuzzlesChess Board PuzzleChess PuzzlesChristmas Puzzlecipher PuzzleCivil Services PuzzleClock time puzzleCognizant Interview PuzzlesCoins PuzzleComputational PuzzleconundrumCoronavirus PuzzleCoupondunia Interview PuzzleCritical Thinking Puzzledata analyticsData Structure Interview QuestionsDecode PuzzleDetective PuzzlesDice PuzzleDictionary Riddlesdifficult riddleEasy Math puzzlesEasy puzzlesEinstein puzzleEnglish RiddleFamily Tree Puzzlefamous puzzleFill in the blanks riddlesFinding Killer RiddlesFlipkart interview puzzlesFunny RiddlesGeneral KnowledgeGeographical PuzzleGoogle Code Jam 2014Google Interview PuzzlesGRE PuzzleHard Puzzle