Thermodynamics ...

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Assertion : Reversible systems are difficult to find in real world.

Reason : Most processes are dissipative in nature

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Assertion : Thermodynamic process in nature are irreversible.

Reason : Dissipative effects can not be eliminated.

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Assertion : The isothermal curves intersect each other at a certain point.

Reason : The isothermal change takes place slowly, so the isothermal curves have very little slope.

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Assertion : We can not change the temperature of a body without giving (or taking) heat to (or from) it.

Reason : According to principle of conservation of energy, total energy of a system should remains conserved.

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Assertion : The specific heat of a gas is an adiabatic process is zero and in an isothermal process is infinite.

Reason : Specific heat of a gas in directly proportional to change of heat in system and inversely proportional to change in temperature.

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Assertion : The heat supplied to a system is always equal to the increase in its internal energy.

Reason : When a system changes from one thermal equilibrium to another, some heat is absorbed by it.

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Assertion : A room can be cooled by opening the door of a refrigerator in a closed room.

Reason : Heat flows from lower temperature (refrigerator) to higher temperature (room).

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Assertion : If an electric fan be switched on in a closed room, the air of the room will be cooled.

Reason : Fan air decrease the temperature of the room.

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Assertion : The internal energy of an isothermal process does not change.

Reason : The internal energy of a system depends only on pressure of the system.

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Assertion : An adiabatic process is an isentropic process.

Reason : Change in entropy is zero in case of adiabatic process.