When monkey rotate the gear, which mark will be hit 1 or 2 ?

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

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

What occurs twice in a week, once in a year but never in a day?

What can you see in the middle of March and April that you can never see in any other month?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?