Find the hidden tiger in the given optical illusion ?

Can you find the six hidden animals in the picture below?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

What question can you never answer yes to?

I am white when I am dirty, and black when I am clean. What am I?

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

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?