What always comes into a house through the keyhole?

Out of four images which one is the odd one out?

A farmer went to a market and bought a wolf, a goat, and a cabbage. On his way home, the farmer came to the bank of a river and rented a boat. But crossing the river by boat, the farmer could carry only himself and a single one of his purchases: the wolf, the goat, or the cabbage. If left unattended together, the wolf would eat the goat, or the goat would eat the cabbage. The farmer’s challenge was to carry himself and his purchases to the far bank of the river, leaving each purchase intact. How did he do it?

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?

In the picture given below, can you find out which digit will take place of the question mark?

What does a man do only once in his lifetime, but women do once a year after they are 29?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Can you find a number that lies one third of the distance between 1/3 and 2/3?