I have teeth but i don't bite. Who Am I ?

What does this rebus mean?

O
N
C
E
TIME

I start and end with 500 and carry a 5 in my heart. But I require the first letter and the first number to be complete. I am the name of a King.

Who am I ?

What building has the most stories?

What part of Turkey has the most feathers?

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

What has hands, but can’t clap?

Can you find out which options fits best with the missing column?

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?