Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Buy me, smell me or deliver me, I do not change.

Who am I?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

If all the below statements are true

1. Gianni was either in Italy or France in 1997.
2. If Gianni did not kill Versace, Hilton must have killed him.
3. If Versace died of suffocation, then either Gianni killed him or Versace committed suicide.
4. If Gianni was in Italy in 1997, then Gianni did not kill Versace.
5. Versace died of suffocation, but he did not kill himself.

Who killed Versace and where was Gianni in 1997?

Why is it very easy to weigh a fish?

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?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

What question can you never answer yes to?