No one wants to have it, but if one got it, he does not want to lose it. What is It?

An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

What did she say to the students?

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

How can a man go eight days without sleep?

Whats the next number in the below number sequence pattern.

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

How can you leave a room with two legs and return with six legs?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

What jumps when it walks and sits when it stands?

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