Out of four images which one is the odd one out?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What type of tree can I carry in my hand?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?

Solve the counting riddle by identifying the number of triangles in the given picture.

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

Complete the following series. It.s very logical:

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

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)