Which alphabet letter is a question?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

Can you write down eight eights so that they add up to one thousand?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Forwards I am heavy, backward I am not. What am I?