Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

I cannot talk, but I always reply when spoken to. What am I?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?

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

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What can you deduce from the following BrainBat?

CRY
LMKI

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Can you count the number of squares in the given picture?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?