PS CA6(2)

Which of the following is the main focus of thermodynamics?

• Energy transfer and conversion

• Material properties

• Color of substances

• Electrical currents

What is a thermodynamic system?

• A closed loop of electrical circuits

• The specific part of the universe being studied

• A randomly selected group of molecules

• A fixed volume of solid materials

Which type of system exchanges energy but not matter?

• Open system

• Closed system

• Isolated system

• Non-equilibrium system

What does the First Law of Thermodynamics state?

• Heat cannot flow from cold to hot objects

• Energy cannot be created or destroyed

• Entropy always increases

• Work is independent of energy

What application best demonstrates the First Law of Thermodynamics?

• Refrigeration system

• Combustion engine

• Insulated thermos

• Cryogenic storage

Why can’t a heat engine be 100% efficient?

• Friction reduces efficiency

• Heat loss is unavoidable due to the Second Law of Thermodynamics

• Fuel availability limits energy output

• External forces slow down the engine

The Second Law of Thermodynamics primarily deals with:

• Conservation of energy

• Direction of heat flow and entropy

• Mechanical work

• Conservation of matter

What happens to entropy in a natural process?

• It decreases

• It remains constant

• It increases

• It becomes zero

What is an example of entropy decreasing?

• Gas expanding

• Ice freezing

• Water evaporating

• Combustion in an engine

Which thermodynamic law supports refrigeration systems?

• First Law of Thermodynamics

• Second Law of Thermodynamics

• Third Law of Thermodynamics

• Pascal’s Principle