Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

The centre of the third figure is empty. What digit should fit inside?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

John and his team plan to rob a safe. They got just one chance to break the code else the local police will be informed. Below are clues:
A) Exactly one number is perfectly placed: 9 8 1
B) Everything is incorrect: 9 2 4
C) Two numbers are part of the code of the safe but are wrongly placed: 0 9 3
D) One number is part of the code of the safe but is wrongly placed: 1 4 7
E) One number is part of the code of the safe but is wrongly placed: 7 8 3

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

What number when divided in half becomes zero?