#1
Which of the following is an example of conduction?
Touching a hot stove
ExplanationConduction is the transfer of heat through direct contact between objects.
#2
What happens to the particles of a substance when it changes from a solid to a liquid?
Particles move farther apart
ExplanationAs a substance changes from a solid to a liquid, its particles gain energy and move farther apart, causing the substance to expand.
#3
Which of the following is an example of radiation?
Feeling warmth from the sun
ExplanationRadiation is the transfer of heat energy through electromagnetic waves, such as feeling warmth from the sun or a fire.
#4
What is the process by which a gas changes into a liquid?
Condensation
ExplanationCondensation is the process where a gas changes into a liquid due to a decrease in temperature or increase in pressure.
#5
What is the name of the process where a gas changes directly into a solid without becoming a liquid first?
Sublimation
ExplanationSublimation is the process where a substance transitions directly from a gas phase to a solid phase without passing through the intermediate liquid phase.
#6
Which property of a material refers to its resistance to flow?
Viscosity
ExplanationViscosity is the property of a fluid that describes its resistance to flow.
#7
Which of the following materials is the best conductor of electricity?
Copper
ExplanationCopper is an excellent conductor of electricity due to its high electrical conductivity.
#8
Which statement accurately describes the first law of thermodynamics?
Energy cannot be created nor destroyed, only transformed
ExplanationThe first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, only changed from one form to another.
#9
What is the main factor that determines the specific heat capacity of a substance?
The substance's chemical composition
ExplanationSpecific heat capacity is primarily determined by the chemical composition of a substance, as different substances require different amounts of energy to raise their temperature by a certain amount.
#10
Which property of a material is a measure of its ability to conduct heat?
Thermal conductivity
ExplanationThermal conductivity is the property of a material that describes its ability to conduct heat.
#11
What is the term for the transfer of energy due to the movement of fluids?
Convection
ExplanationConvection is the transfer of heat through the movement of fluids, such as air or water.
#12
What is the process by which a substance absorbs heat energy and changes from a solid to a liquid?
Melting
ExplanationMelting is the process where a substance absorbs heat energy, causing its particles to overcome their attractive forces and transition from a solid phase to a liquid phase.
#13
Which type of energy transfer does not require a medium?
Radiation
ExplanationRadiation is the transfer of energy through electromagnetic waves and does not require a medium.
#14
What is the unit of measurement for specific heat capacity?
Joule per kilogram per kelvin (J/kg·K)
ExplanationSpecific heat capacity is measured in joules per kilogram per kelvin (J/kg·K), representing the amount of energy required to raise the temperature of one kilogram of a substance by one kelvin.
#15
Which process involves the direct conversion of solid to gas without passing through the liquid phase?
Sublimation
ExplanationSublimation is the process by which a substance transitions directly from a solid phase to a gas phase without going through the intermediate liquid phase.
#16
Which law of thermodynamics states that the entropy of an isolated system always increases?
Second law
ExplanationThe second law of thermodynamics states that the entropy of an isolated system always increases over time, indicating the tendency of systems to move towards a state of disorder.
#17
Which law of thermodynamics states that the energy of a closed system is constant?
First law
ExplanationThe first law of thermodynamics, also known as the law of conservation of energy, states that the total energy of a closed system remains constant over time.
#18
What is the term for the transfer of energy through electromagnetic waves?
Radiation
ExplanationRadiation is the transfer of energy through electromagnetic waves, such as heat from the sun or microwaves.
#19
Which process involves the conversion of a gas directly into a solid without passing through the liquid phase?
Deposition
ExplanationDeposition is the process where a substance transitions directly from a gas phase to a solid phase without passing through the intermediate liquid phase.