Do You See It?

What does below Rebus mean ?

esgg sgeg gegs gsge

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

Find the hidden tiger in the given optical illusion ?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

How many letters are in the alphabet?