Question

Energy of a system is defined as:

1. path function and intensive property
2. path function and extensive property
3. point function and intensive property
4. point function and extensive property

Answer 1

Correct Answer - Option 4 : point function and extensive property

Concept:

Point function:

• The thermodynamic properties which depend on the end state only (independent of the path followed) are known as point function like temperature, pressure, density, volume, enthalpy, entropy etc.

Path function: 

• The thermodynamic properties which depend on the end states, as well as the path followed, are known as path function like heat and work.

Thermodynamic property: 

• A thermodynamic property is any property that is measurable, and whose value describes a state of a system.
• Some e.g of the thermodynamic property are pressure, temperature, viscosity, density. 
• Properties are point function i.e. these do not depend on the path followed. ​

Intensive Property: 

• These are the properties of the system which are independent of mass under consideration. For e.g. Pressure, Temperature, density, etc.

Extensive Properties:

• The properties which depend on the mass of the system under consideration. For e.g Internal Energy, Enthalpy, Volume, Entropy, etc.