Can you name four days which start with the letter 'T'?

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?

Prove that twice of ten is the same as twice of eleven.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Different lights make me strange by changing me into different sizes. What am I?

Why do we preferably have round manhole covers and not square ones?

Suppose you are a girl candidate and sitting in an interview. Suddenly the interviewer asks you, 'What if one morning you wake up and find out that you are pregnant?

How will you reply to such a question?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?