What number when divided in half becomes zero?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

It belongs to you, but other people use it more than you do. What is it?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

All of you like to eat me. I am a five-lettered word. Remove the first two and I turn into an infamous animal. Remove just the first and I become a heinous crime. Remove the first and the last and you can groove on me.

Can you guess who am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

What seven-letter word has hundreds of letters in it?

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