What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Buy me, smell me or deliver me, I do not change.

Who am I?