Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What has a ring but no finger?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?

Why do you find that most of the buildings are deprived of the 13th floor?

Can you find out who is the kidnapper in below Picture and why, Explain ?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?