Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

What came first, the chicken or the egg?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

I have eight fingers and two thumbs but I do not live. What Am I?