Solution:

South

Explanation:
If you turn the picture upside down, you will see South.

Solution:

The bridge won't break.

When the car has travelled half of the bridge, that is 15km, the car must have used more than 300 grams of fuel. Therefore, the impact of bird's added weight will be zero literally.

Solution:

40 balls

Solution:

Since the knife was in her hand which implies that she was planning to kill her husband "Inspector Montalbano".

Solution:

5 leopard and one sheep

since all animal are rational , once 1st leopard eats the sheep all the rest of leopard would know about this.

Solution:

"World War I" was named after after "World War II"

Solution:

Move the coins as given in the figure and you will get the required result.

Solution:

2 minutes (duration between 9:59 and 10:01)

Solution:

7

Explanation:
8th is bald man head, check the video below.

Solution:

There are 3 fruits (1 grapes, 1 apples, and 1 oranges).

Solution:

The two numbers are 4 and 13 whose product is 52 and sum is 17.