Chapter 6: Energy and Matter Review

What is the difference between mass and weight?

• Mass is the force of gravity acting on an object, while weight is the quantity of matter in an object.

• Mass is measured in kilograms, while weight is measured in Newtons.

• Mass is affected by gravity, while weight is not.

• Weight is the force of gravity acting on an object, while mass is the quantity of matter in an object.

Which of the following is used to convert pounds to kilograms?

• 1 lb = 2.2 kg

• 1 lb = 0.454 kg

• 1 lb = 0.5 kg

• 1 lb = 0.393 kg

What is the relationship between density and specific volume?

• Density is the volume occupied by a unit mass; specific volume is the mass per unit volume.

• Density is mass per unit volume; specific volume is the volume per unit mass.

• Both are the same.

• Neither is relevant to HVAC.

What is the freezing point of water?

• 0°C (32°F)

• 100°C (212°F)

• -1°C (30°F)

• -273.15°C (0 Kelvin)

Which temperature point is the highest at which a substance can exist as a liquid?

• Freezing point

• Absolute zero

• Critical temperature

• Boiling point

What does Boyle’s Law describe?

• The relationship between temperature and volume at constant pressure.

• The relationship between pressure and volume at constant temperature.

• The relationship between volume and temperature at constant pressure.

• The relationship between total pressure and partial pressures in a gas mixture.

According to Charles’s Law, what happens to the volume of a gas when temperature increases at constant pressure?

• The volume increases.

• The volume decreases.

• The volume remains unchanged.

• The volume fluctuates.

What does Dalton’s Law state?

• The total pressure of a gas mixture is equal to the sum of the partial pressures of the individual gases.

• The pressure of a gas is inversely proportional to its volume.

• The volume of a gas is directly proportional to its temperature.

• The volume of a gas is inversely proportional to its pressure.

Which of the following describes the difference between heat and temperature?

• Heat measures the average kinetic energy of particles, while temperature measures the total energy of the system.

• Heat is the total energy of molecular motion, while temperature is the average energy of molecular motion.

• Temperature and heat are the same.

• Heat and temperature are not related in HVAC systems.

What is the unit of heat in the SI system?

• Joule

• Celsius

• Kelvin

• Fahrenheit