What is wrong in the below Picture?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What goes up but never comes down?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

What Deficiency does the below rebus represent?

VIT_MIN

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

How many letters are in the alphabet?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

I have teeth but i don't bite. Who Am I ?