What has hands, but can’t clap?

When can we add 2 to 11 and get 1 as the correct answer?

Can you place six X (crosses) in below board without making three in a row in any way ?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

I add 5 to 9 and get 2. The answer is correct, so what am I?

A bomb exploded in a room full of married couples and no one died. How?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

Can you find the thief by just looking at the picture below?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?