What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

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?

What has many keys but can’t open a single lock?

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

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

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

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