Which wheel of car does not rotate when you turn your car right?

In the picture given below, can you find out which digit will take place of the question mark?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

How many Watermelons are there in the below picture?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

What have one eye but still cannot see?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Spot what is wrong here in below Picture?

Can you count the number of triangles in the given picture?