is it possible that if i have a cabin which is insulated from outside but is built with some sort of material like copper and there is a heating element of sort which is providing 100C constantly but because room is totally insulated and shut can the temperature goes upto 1000C or not ? if it is what kind of material can be used other can copper ?
If the heating element is constantly at 100°C, there is no way it can cause the room can get warmer than 100°C.
Otherwise, perpetual motion machines would be possible.
If you meant the heating element is providing a constant 100 Watts, then it is possible for the room to get to 1000°C with enough (meaning a lot) of insulation.
Your copper building might weaken to the point of collapse at 1000°C because copper melts at 1083°C.
To answer the question the way it's asked
heating element of sort which is providing 100°C constantly but because room is totally insulated and shut can the temperature goes upto 1000°C or not ?
No, this is not possible. A 100°C heater can't heat its surroundings above 100°C. Heat will not pass from cold part of the system to hot part of the system. Heat passes only from a hotter to a colder system. First law of thermodynamics.