Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Buy me, smell me or deliver me, I do not change.

Who am I?

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

How many letters are in the alphabet?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

If eleven plus two equals one, what does nine plus five equal?

What does below chemistry rebus means?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"