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

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Why do you find that most of the buildings are deprived of the 13th floor?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Which number should replace the question mark?

Can you decipher the two rows to find the hidden word?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?