Logic Riddles

Question: A man was looking at a picture. While staring at the picture he said, brothers and sisters I have none but this man's father is my father's son. Who is in the picture?

Question: You work at a factory that produces dumbbell weights for lifting. One of the 10 machines has been producing weights that are always 1 pound less than the rest of the machines. You have a large scale used to weigh the weights for quality control. How could you find the defective machine by using the scale only once? You are allowed to make as many weights with the machines as you please.

Question: what goes in your mouth hard and dry and comes out wet and soft?

Question: What is the only place you leave without entering it?

Question: I was crucified to keep murders out of the maze. What am I?