Find the smallest sentence with all the English alphabet.

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.

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A bridge is about to collapse. There are four people P, Q, R and S on one of the sides. Before the bridge collapses, they want to cross it. Now since the bridge is too weak, it can only stand the weight of two people at a time. Also, it is night time and nothing is visible. They have just one torch with them.

Now P takes one minute to cross the bridge, Q takes two minutes to cross, R takes five minutes to cross and S takes ten minutes to cross.

The bridge will collapse in seventeen minutes. How will they be able to cross the bridge before it collapses?

Which digit occurred maximum times between the number 1 and 1000?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Do you know who was buried in John's tomb?