Several IQ test puzzles

Question

Here are some fun puzzles I would like to know the answers and explanations for. Enjoy! Source.

1.

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5.

Answer 1

1)

Diagonals - 1x3,2x2,3x1 and 1x1,2x3,3x2.
So now it is easy to add 3x3 when you consider 1x2 and 2x1.
In each color there is 1-2-3 black squares, 1-2-3 dark grey squares and 1-2-3 light grey squares. So for blue squares i need to find square with 3 black, 2 dark grey and 1 light grey.

2) - is green surely correct solution?

Because it looks like dots are moving always by 1, so B. Sometimes you cannot see them, because they are under black squares, but still there.

3)

Changing order is x → o → ▲ → x (…), except third to first row, which is just simple turn. Each symbol after change move by one to the right or new row.

4)

D, first and last row has always only one change and for columns next one has two things in common.

5)

A, Like normal clock, except 3 clock hands moving clockwise each turn and one counterclockwise.