If Rajina's daughter is my daughter's mom, who am I to Rajina?

You can see it everyday, But cannot touch it at will. What is it?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

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 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?

What goes up but never comes down?

What word is pronounced the same if you take away four of its five letters?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?