What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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.

If an electric train is travelling south, then which way is the smoke going?

What month of the year has 28 days?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

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