What is the Surname of Barbie Doll?

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?

You need to complete the maze by entering from the entrance marked below in the figure near the yellow circle, bottom left and leaving from the exit point near the green circle, bottom middle.

Rule of Game: You can move only by exchanging green and yellow circles.

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

What can go up a chimney down, but can’t go down a chimney up?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

Count the number of balls in picture below:

When it's bad luck to meet a black cat?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?