The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Which wheel of car does not rotate when you turn your car right?

What goes up but never comes down?

What always comes into a house through the keyhole?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?

The dirtier I get, the whiter I look. Who am I?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Replace the question mark with the correct number in below Picture:

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