I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What is wrong in the below Picture?

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

I am a ten letters word
The first four letters have the power to rule,
Next, four-letter can be eaten.
The next three-letter represents a lady.
I can fly as well

what am I looking for?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

Can you replace the question mark with the correct number?