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

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

What happened when the wheel was invented?

What is next number in the pattern below:

131 517 192 123 ?

In a university, a professor gave a set of three problems to the three brilliant students of his class. See the image for the questions.

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

In the image below, can you find the value of an angle(y)

You need to move three matchsticks to form three squares. Can you do it?