Thermodynamics Quiz

What is the First Law of Thermodynamics?

• Energy cannot be created or destroyed, only transformed.

• Heat is a form of energy that flows from a body of high temperature to one of lower temperature.

• For a system undergoing a cyclic process, the net heat supplied to the system from its surroundings is equal to the net work done by the system on its surroundings.

• The entropy of any isolated system always increases.

Which mechanism of heat transfer does not require a medium?

• Conduction

• Convection

• Radiation

• All of the above require a medium

What is the specific heat capacity of a substance?

• The amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius.

• The amount of heat required to change the state of a unit mass of the substance without changing its temperature.

• The amount of heat required to increase the temperature of the substance by two degrees Celsius.

• The amount of heat required to decrease the temperature of a unit mass of the substance by one degree Celsius.

What does thermal equilibrium mean?

• It is the point at which two substances reach the same temperature and heat no longer flows between them.

• It is the condition under which a substance changes from solid to liquid.

• It is the condition under which a substance emits the maximum amount of radiation.

• It is the point at which a substance can no longer absorb heat.

Which of the following is an example of heat transfer by conduction?

• Heating a room with a space heater

• Warming your hands by holding a hot cup of coffee

• Feeling the warmth of the sun on your face

• Boiling water in a pot

What is latent heat?

• The heat required to change the temperature of a substance without a phase change.

• The heat released by a substance during a phase change.

• The heat absorbed or released by a substance during a phase change.

• The heat required to increase the temperature of a substance by 1°C.

What is the greenhouse effect?

• The process by which the surface of the Earth is warmed by the sun.

• The process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.

• The process by which the Earth's atmosphere cools down due to heat escaping into space.

• The process by which the Earth's atmosphere blocks all solar radiation from reaching the surface.

What distinguishes the enhanced greenhouse effect from the natural greenhouse effect?

• The enhanced greenhouse effect is caused solely by natural processes, while the natural greenhouse effect is caused by human activities.

• The enhanced greenhouse effect refers to the additional warming that occurs when the Earth's atmosphere traps more heat due to increased levels of greenhouse gases from human activities.

• The enhanced greenhouse effect leads to a cooling of the Earth's surface, while the natural greenhouse effect leads to warming.

• There is no difference; they are the same phenomenon.

What is the Second Law of Thermodynamics?

• Energy cannot be created or destroyed.

• The total entropy of an isolated system can never decrease over time.

• Heat cannot spontaneously flow from a colder location to a hotter location.

• Both B and C are correct.

Which of the following is an example of heat transfer by convection?

• Using a flat iron to press clothes

• Warming a room by a radiator

• Cooking food in a microwave oven

• Sunlight warming the Earth's surface