What is the coolest letter in the alphabet?

Which alphabet letter is a question?

What is the word or phrase?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

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

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

When is the top of a mountain similar to a savings account?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?