Question

Closed system is :
A) Perfectly Sealed
B) Perfectly insulated
C) Both perfectly insulated and sealed
D) Neither insulated nor sealed

Answer 1

Hint:In a closed system, a fixed amount of matter is considered, that is the mass will be constant throughout the observation. Though there can be an exchange of energy with the surroundings but it cannot exchange any matter.

Step by step solution:
In a closed system, there will not be any exchange of matter. To make sure that there will not be any exchange of matter we must perfectly seal the system. This means that a closed system must be perfectly sealed.

We also know that in a closed system, there will be an exchange of energy with the surroundings. In most cases, the energy is exchanged through heat transfer. For a heat transfer to take place the system should not be insulated. Because in an insulated system heat transfer will not take place.

From this knowledge of a closed system, we can see that a closed system is a perfectly sealed system.

So, the correct answer is option (A).

Additional Information:
There are three types of systems in thermodynamics:
-Open systems – These systems can transfer matter as well as energy with its surroundings. The volume of such systems will not be fixed.
-Closed systems – As discussed above, a closed system is a physical system that doesn't exchange any matter with its surroundings.
-Isolated systems – Isolated systems are a particular type of closed system where there will be no transfer of energy also. The system will be completely isolated from its surroundings and there will not be any kind of interactions with the surroundings.

Note:A system is sealed to prevent the exchange of matter between the system and its surrounding. A system is insulated to prevent the exchange of energy between the system and its surroundings. An open system is neither sealed nor insulated. A closed system is perfectly sealed and an isolated system is both perfectly sealed and perfectly isolated.