What do you think with the below Picture ?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Fate has decided that you will only be pleased to meet me when you need me

Maybe that is why, when I am working, I start working

However annoying I may be to the regulars, the little ones are always inspired

I will always be waiting if you try to reach me

How many of you can guess my name, let me see

What Does this text mean:

important=important

Which number comes next in the number series?

2, 9, 30, 93, ?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Which word does the below Plexor means ?

When does a USA Potato change its nationality?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?