What is so fragile that saying its name breaks it?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Find out the number of circles in the given picture having Illusion

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Which English verb becomes past tense just by rearranging the letters?

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?