Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

What four weights can be used to balance from 1 to 30 pounds?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

If eleven plus two equals one, what does nine plus five equal?

How can you make number one disappear by adding something to it?

Before Mount Everest was discovered, what was the highest mountain in the world?

I am the fastest animal but cannot climb the tree. What am I?