In which direction should the missing arrow point?

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What does this Rebus Picture means ?

Find the next number in the sequence

5 12 24 36 ?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Take one out and scratch my head, I am now black but once was red. What am I?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

There are seven sisters in a house in a village where there is no electricity or any gadget.

Sister-1: Reading Novel
Sister-2: Cooking
Sister-3: Playing Chess
Sister-4: Playing Sudoku
Sister-5: Washing clothes
Sister-6: Gardening

what is Sister-7 doing ?