I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

What jumps when it walks and sits when it stands?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What is the riddle which can be asked all day with a different correct answer each time.

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

I have an eye but still cannot see.

Who am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What is the Surname of Barbie Doll?