Solution:

Every segment in the new circle moves 90 degrees clockwise.

Solution:

41

There are 6 people alive, plus you and there are 34 people dead. Making it a total of 41 people in the room.

Solution:

Chilwell can go through as all the person whose name contains even number of letters can go through the door.

This is a classic green glass door riddle.

Solution:

2

2^2^(2 * 0)^2
2^2^(0)^2
2^2^0
2^1
2

Solution:

B

every next plate makes a 1/4 turn clockwise.

Solution:

Kiwi

Kiwi is a bird.
Kiwi is a fruit.
Kiwi is a person ("Kiwi" is a common self-reference used by New Zealanders)

Solution:

10

Solution:

Person-1

Explanation:
Person-3: Some will say the answer to be person-3 as his body is floating in the water. But the question is do dead bodies float in water?. The answer is yes, but it takes at least 2 to 3 days for a dead body to float. In the starting 1 to 2 days, a dead body sink under the water, thereafter it starts floating. Thus, person-3 is not dead.

Person-2: There is vibration in the water. This makes us sure that person-2 is not dead.

Person-1: If you see closely, he is having a book in his hand and it is in the water. Also, he seems to be in a subconscious state.

So, the answer to this puzzle is Person-1.

Solution:

The number of differences is the same as the number of legs of the spider.

Solution:

The deer hiding in the trees.