Which alphabet letter is a question?

I shave every day, but my beard stays the same. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

What makes this number unique: 8,549,176,320?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

The Little ant seems to be always confused. Do you know why?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

What runs around the whole yard without moving?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?