What is so fragile that saying its name breaks it?

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

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

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?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

Living above a star, I do not burn
Eleven friends and they do not turn
I can just be visited in a sequence, not once or repeatedly
PQRS are my initials
Can you tell my name accurately?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

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