What question can you never answer yes to?

Count the number of squares in the picture below.

Can you tell a 3D object that has just two surfaces?

Why is the Hole below a Lock?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

What Time Should the last watch show in the below figure?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?