What is so fragile that saying its name breaks it?

A boy collects white seashells from the sea and brings them home every night. When he has enough of them, he decides to sell them to a trader.

The trader is ready to buy the shells and he asks the boy about the quantity. At this, the boy starts calculating. He has a giant box that contains 3 mini boxes. Two of them have another mini box inside. If the giant box can hold 50 shells, how many brown shells can he sell to the trader?

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?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

What can you deduce from the following BrainBat?

CRY
LMKI

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

What am I?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

What Time Should the last watch show in the below figure?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98