What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Which is the correct shadow of the bird?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

I know a nine-letter word having only one vowel.
Do you ?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.