What occurs twice in a week, once in a year but never in a day?

Which alphabet letter is a question?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

At a Society election for president, precisely 963 votes were cast.
There is a total of 4 candidates that participate in the election.

The winning candidate exceeds the opponents by 53, 79 and 105 votes.

How many votes do each candidate gets?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

What two things can you never eat for breakfast?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?