Which tank will fill first?

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

Who always enjoys poor health?

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

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

What breaks yet never falls, and what falls yet never breaks?

Spot 5 differences in two Christmas tree below:

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

who is silent in the parliament?