What do you answer even though it never asks you questions?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

What will you call your mother's brother's brother-in-law?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

What goes up but never comes down?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

If nine thousand, nine hundred nine dollars is written as $9,909,
how should twelve thousand, twelve hundred twelve dollars be written?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

What runs around the whole yard without moving?