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

What goes up but never comes down?

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

What is always in front of you but can’t be seen?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

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?

I have eight fingers and two thumbs but I do not live. What Am I?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?