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

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?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What is the next number in this matchsticks series riddle?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

Give it food and it will live; give it water and it will die.

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?