Which alphabet letter is a question?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

I have branches, but no fruit, trunk or leaves. What am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What is always in front of you but can’t be seen?

What kind of band never plays music?

Use the numbers 2, 3, 4 and 5 and the symbols + and = to make a true equation. Conditions: Each must be used exactly once and no other numbers or symbols can be used.

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?

What work can one never finish?