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?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Give it food and it will live; give it water and it will die.

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months