What is both possible and impossible at the same time?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

A Detective reviewed the information they had on the case so far.

A lady named 'Caterina' was found shot and they already had a list of suspects - Ankit, Tarun, Harish, Manoj and Manish.
The killer is a fan of challenges him by leaving notes ad various places.
* The first was found in a toilet room.
* The second was found in an art room.
* The third was in a restroom.
* the fourth in an underwater room.
* The fifth at the no-smoking room.

All of the notes read the same thing, 'The clues are where you find the notes.' Yet, nothing was found at any place the notes were.
Detective the genius, immediately solved the case.
Who was the killer?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

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

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

John is the son of Jacob.
So,
Jacob is the_____of John's father?