I have an eye but still cannot see.

Who am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

What demands an answer, but asks no questions

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Replace the question mark with the correct number in the below-given picture?

Can you count the number of lines in the below picture?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Identify the 10 differences between the two given pictures.

When 99 is considered higher than 100?