Move four matchsticks to the below square to form three squares?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Can you find the mistake in the below statement?

What does this mean?

CCCCCCC

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

I am lying and I always lie. Tell me whether I am lying or telling the truth.