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

How many letters are in the alphabet?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Can you divide the below-given shape into four equal and identical pieces?

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?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?