When we see 2 but call 10?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

Can you count the number of lines in the below picture?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Which English verb becomes past tense just by rearranging the letters?

Can you solve the below tricky visual equation?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

Keyboard words are not in alphabetical order, Why?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)