If an electric train is travelling south, then which way is the smoke going?

What breaks yet never falls, and what falls yet never breaks?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

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?