What does this mathematical rebus means ?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

Can you spot the hidden girl in the picture below?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you divide the below-given shape into four equal and identical pieces?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Can you move 2 matchsticks to form four equal sized squares.