There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What is the Surname of Barbie Doll?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

I travel all around the world but always stay in the corner. What am I?

How is the moon similar to a dollar?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

If your uncle’s sister is not your aunt, what relation is she to you?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Imagine you are in a room with no windows or doors. How will you get out?

You can hear me, but you can't touch or see me.

What am I?