Bay of Bengal is in which state?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What is the next number in this matchsticks series riddle?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

10+10 and 11+11 can give you the same answer.

Explain how?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

What can go through glass without breaking it?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?