Here is a mathematical expression that also secretly tells a movie name. What movie is that?

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?

How do you go from 98 to 720 using just one letter?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

Tell me the Hindi name of a Vegetable which if we remove 1st word will become a precious Stone and by removing the last word it will become a sweet eatable.

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

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

I taste better than I can smell. Who am I?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

I know a nine-letter word having only one vowel.
Do you ?