How many sides does a circle have?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

I have an eye but still cannot see.

Who am I?

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

Which Burger Is Different in below image?

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

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

John was piloting a plane behind a car but was never able to overtake it. Why?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

I have no life, but I can die. What am I?