Nifty Direction

Nifty 50 contains top 50 companies,

Nifty 50 movement is a reflection of movement of these 50 stocks.

That is what the definition says,

Is it possible that Nifty get affected by any other monopoly?

Could not understand this. Could you please clarify?

None

Nifty 50 movement will be a reflection of those 50 stocks only. But weightage will be vary for each scripts.
you can refer this for more details.