A well-stoppered thermos flask containing some ice cubes is an example of:
Correct answer: C. isolated system
- A. closed system
- B. open system
- C. isolated system
- D. None of the above
Explanation
Thermoflask will not allow the exchange of matter and energy with the surrounding environment. Hence, it is an example of an isolated system.
This question appeared on the ETEA MDCAT 2006 paper, which you can sit online with every answer explained.
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About System, Surroundings and State Functions
A system is the part of the universe under study, while everything outside it is the surroundings; the boundary separates them. State functions such as pressure, temperature, volume, internal energy and enthalpy depend only on the state, unlike heat and work, which depend on the path taken.
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