Solution:

The boy who has written answers in his arms.

Solution:

Rick wasn't at home. He Parked his car after snow built up on the driveway.

Solution:

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

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:

10

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:

B

every next plate makes a 1/4 turn clockwise.

Solution:

The door hinges are on the opposite side.

Solution:

11

You already knew the answer wasn't 26 letters. That would be too easy.
The letters in the words "the alphabet are 11

Solution:

Bottom one