How many sides does a circle have?

How many times can you subtract the number 5 from 25?

Can you write down eight eights so that they add up to one thousand?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

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

The more you take me, the more you leave me behind.
Who Am I?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

What is the Surname of Barbie Doll?

I have an eye but still cannot see.

Who am I?