I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Which is the correct shadow of the bird?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

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

Can it be possible to build a house that has all its four walls facing towards the South?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

What is the probability of choosing the correct answer at random from the options below?

a) 1/4
b) 1/2
c) 1
d) 1/4

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

A man dies of old age on his 25 birthday. How is this possible?