Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

How many triangles can you find in this given picture?

It belongs to you, but other people use it more than you do. What is it?

Can you find the 09 errors in the picture below?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

What always comes into a house through the keyhole?

Which alphabet letter is a question?

Assume the given figure to be a delicious doughnut. Yes, now you can concentrate more on the puzzle. So you have this delicious doughnut in your refrigerator when your friends come knocking at the door. There are eight of them. Now you have to make three cuts in this doughnut so that each one of you nine people can enjoy a piece of it. Neither you nor your friends would mind the size of their piece as long as they are getting it. How will you do it?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?