Engineering Thermodynamics
An adiabatic wall is one which

Permits thermal interaction
Prevents thermal interaction
Discourages thermal interaction
Encourages thermal interaction

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Engineering Thermodynamics
Intensive property of a system is one whose value

Is not dependent on the path followed but on the state
Does not depend on the mass of the system, like temperature, pressure, etc.
Depends on the mass of the system, like volume
Is dependent on the path followed and not on the state

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Engineering Thermodynamics
According to First law of thermodynamics,

Total internal energy of a system during a process remains constant
Work-done by a system is equal to the heat transferred by the system
Total energy of a system remains constant
Internal energy, enthalpy and entropy during a process remain constant

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