What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

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Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

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 month of the year has 28 days?

Can you find the missing piece of the Porsche?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

How many sides does a circle have?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

I have no life, but I can die. What am I?

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?