I have a question in my mind disturbing me from a long time, the question is that are there ghosts in real or they are just delusions or misconception of our mind, and if ghosts are not there then who spread the rumor that something like 'GHOSTS' occur????

I think that there are ghosts. They are present in many places of the world. for ex Delhi cantt, ramoji film city, bhangarh fort, the mental hospital in south africa and many other.
the story related to the delhi cantt is every night the visitors see a woman standing in white clothes standing on road and asking for lift. if do not give lift she would run faster than our car and leave us behind. the things kept in ramiji film city automatic fall and very weird voices began to occur.

I believe in ghosts. some months ago a scientists has proved that there are ghosts. many people do not believe it but i believe in both god and ghosts. 

Yatharth can u name that scientist please. And are those storys real. Have u seen that woman who stands wearing white clothes.

Of course they do. Thousands of people from all nations around the world report seeing them under more or less similar circumstances. 
The most important thing to know about ghosts is that they are not the souls of dead people returned to communicate with the living. Dead is dead. Unless you believe in the rebirth of the lower soul with the memories of its past lives intact, there is no coming back 
Neither are ghosts physically present when you see them. Ghosts are often described as shadowy or translucent. Only portions of their body may Some ghosts appear as real and as solid as a person of flesh and blood. Some appear in full daylight, and are seen by numerous persons at the same time, 
One may ask how a projected astral image can touch you? The answer is a bit difficult. Because it challenges our normal concept of reality. Usually there is a difference between our perception of a physical object.. 
If ghosts are merely exorbitant recordings of past events, how do they interact and communicate with human beings? Usually, they don't. When they do take notice of a human observer., 
Are ghosts dangerous? Usually not. In their most common manifestation they are merely shadows or images without physical substance.. The most important thing we can say about ghosts is, never mistake a ghost for the human being it resembles.