Solution:

Tank "F".

Explanation:
The water will flow as illustrated in the picture below and hence Tank "F" will fill first.
Note: Water supply for pipe "H" is blocked and hence won't fill at all.

Solution:

If you take a look closely, you will acknowledge the fact that every symbol in the given figure is somehow associated with the surrounding one’s position. The upside-down spade is used to the left of a right-side-up heart every time.

Solution:

2003.

Explanation:
Its a series of prime numbes.

Solution:

In the corners of the square, tighten two ropes. Tighten another rope between them by putting rings on each rope. That rope should be tightened on the sheep's neck on the other end.

Solution:

Yes, some people are going get really tiny pieces but you were allowed for that right. Also, there is another way of doing it. Can you think of it?

Solution:

The figure tells that B is located to the North-East of E.

Solution:

A Question

Solution:

The matchsticks that are marked with red are to be removed and the final figure will have just two squares. You can remove either pair from the possible four ways.

Solution:

The Bangladeshi seaman is the thief. This is because the Japanese flag cannot be identified as upside down as it is the same both ways. Thus he is just trying to escape the situation.

Solution:

Since the door is not visible in this picture, the bus is moving in the left direction.

Solution:

The Stars