Take away the whole and some still remain. What is it?

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?

I get hot but I never sweat,
I cook food but I am not a chef,
I have a door but you can't enter me,
I have a light but I am not a lamp.
Who am I?

I have Rs.50 and I spend it in the way as below.

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

What has one eye, but can’t see?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

What goes up but never comes down?