What's the only room from which no one can enter or leave

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

Which alphabet letter is a question?

When it is alive we sing, when it is dead we clap our hands. What is it?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Find out which of the given views in the picture is accurately the top view of the given pyramid.

Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.