How can a man go eight days without sleep?

I’m tall when I’m young, and I’m short when I’m old. What am I?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

Count the number of balls in picture below:

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?