What has many keys but can’t open a single lock?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

I am the fastest animal but cannot climb the tree. What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

If eleven plus two equals one, what does nine plus five equal?

Which is the correct shadow of the bird?