The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

What time is it when an elephant sits on a fence?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

I am working in a bus company. The company recently went under expansion and therefore there was not enough room for all the buses. As a result, twelve buses had to be stored outside.

If the company decides to expand the garage space by forty percent, enough space to accommodate the current buses will be created leaving enough space for twelve more buses if the need arises in future.

Can you calculate the number of buses that the company owns at present?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

What has one letter and starts with an E?