Thermos flask, when closed, is an approximate

open system.

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closed system.

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isolated system.

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None of these

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Solution

The correct option is C isolated system.
An open system is a one which can exchange matter as well as energy with the surroundings. Eg: a beaker of water. A closed system is a one which can exchange only energy with the surroundings. Eg: a liquid in a closed bottle. An isolated system is a one which cannot exchange anything with the surroundings. Eg: Thermos Flask .

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Similar questions

Q. Thermos flask containing tea is an example of a closed system.

Assertion (A): A system is said to be closed if it can exchange energy but not matter.

Reason (R): Coffee in a stoppered thermos flask is an example of closed system.

Q. A closed thermos flask is an example of

Which of the following statement is correct?
(a) The presence of reacting species in a covered beaker is an example of open system.
(b) There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
(c) The presence of reactants in a closed vessel made up of copper is an example of a closed system.
(d) The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?

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