Thermal (Heat) Energy
Which situation best illustrates an increase in thermal (heat) energy of a substance?
A
A cup of hot tea reaching room temperature after an hour
B
A metal spoon cooling down after being removed from hot soup
C
Water freezing in an ice tray in the freezer
D
Ice cubes melting into water on a warm kitchen counter
D
Ice cubes melting into water on a warm kitchen counter
Which statement best describes chemical energy in a molecule of glucose stored in your body?
A
It is kinetic energy because the glucose molecules are moving in your blood.
B
It is thermal energy that directly raises your body temperature when you eat glucose.
C
It is potential energy stored in the bonds between atoms in the glucose molecule.
D
It is electrical energy that only nerve cells can use directly.
C
It is potential energy stored in the bonds between atoms in the glucose molecule.
Which statement best describes how nuclear fission in a power plant generates electricity?
A
Heat from fission turns water to steam, which spins a turbine connected to a generator
B
Fission fragments are pumped through transmission lines to deliver energy to homes
C
Radioactive decay in the fuel rods induces electrons to flow in the power grid without any mechanical steps
D
Splitting heavy nuclei directly creates electric current in the wires of the generator
A
Heat from fission turns water to steam, which spins a turbine connected to a generator
What is radiant energy?
A
Energy from nuclear reactions
B
Energy stored in chemical bonds
C
Energy from moving objects
D
Energy transmitted by electromagnetic waves
D
Energy transmitted by electromagnetic waves
Which statement best describes light energy?
A
It is sound that has been transformed into visible waves in the air.
B
It is a form of electromagnetic energy that can travel through empty space.
C
It is matter made of tiny solid particles that carry heat only.
D
It is chemical energy stored inside atoms that never leaves them.
B
It is a form of electromagnetic energy that can travel through empty space.
On the particle level, what does an increase in thermal energy of a substance primarily correspond to?
A
An increase in the color intensity of the substance
B
An increase in the average kinetic energy of the particles
C
An increase in the number of particles in the substance
D
An increase in the size of the particles themselves
B
An increase in the average kinetic energy of the particles
A burning candle is a good example of chemical energy conversion. What is the main energy transformation occurring in the candle wax as it burns?
A
Chemical energy to light and thermal energy
B
Kinetic energy to chemical and gravitational potential energy
C
Thermal energy to chemical and electrical energy
D
Nuclear energy to light and sound energy
A
Chemical energy to light and thermal energy
What is the primary function of control rods in a nuclear fission reactor?
A
To absorb neutrons and regulate the rate of the fission chain reaction.
B
To cool the reactor core by circulating water through the fuel assemblies.
C
To convert thermal energy from the core directly into electrical energy.
D
To enrich the uranium fuel to a higher percentage of 235U235U during operation.
A
To absorb neutrons and regulate the rate of the fission chain reaction.
Which of the following is NOT a form of radiant energy?
A
Visible light
B
Sound waves
C
X-rays
D
Infrared radiation
B
Sound waves
Why can sunlight reach Earth even though most of space between the Sun and Earth is a vacuum?
A
Because gravity pulls light through space the same way it pulls rocks.
B
Because light energy is carried only by moving air particles in space.
C
Because light is an electromagnetic wave that does not need a medium to travel.
D
Because the vacuum of space is actually full of hidden water vapor.
C
Because light is an electromagnetic wave that does not need a medium to travel.
Why does a metal spoon feel colder than a wooden spoon when both have been sitting in the same room for hours?
A
Metal has a lower thermal conductivity than wood
B
Wood generates thermal energy when touched, but metal does not
C
Wood is at a lower temperature than metal in the same room
D
Metal transfers heat away from your hand faster than wood
D
Metal transfers heat away from your hand faster than wood
In cellular respiration, cells convert the chemical energy in glucose into another molecule that can be used directly for cellular work. Which molecule primarily stores this usable energy?
A
Carbon dioxide (CO2)(CO2)
B
Oxygen (O2)(O2)
C
Water (H2O)(H2O)
D
Adenosine triphosphate (ATP)(ATP)
D
Adenosine triphosphate (ATP)(ATP)
Which comparison between nuclear fission and nuclear fusion is most accurate in the context of energy generation?
A
Both fission and fusion are currently used widely in commercial power plants worldwide.
B
Fusion is easier to control than fission and produces almost no radiation, making it the dominant current nuclear technology.
C
Fission reactions require extremely high temperatures and pressures to occur, whereas fusion does not.
D
Fission splits heavy nuclei like 235U235U to release energy, while fusion combines light nuclei like isotopes of hydrogen to release energy.
D
Fission splits heavy nuclei like 235U235U to release energy, while fusion combines light nuclei like isotopes of hydrogen to release energy.
What happens when radiant energy strikes an object?
A
It is always converted to sound
B
It can be absorbed, reflected, or transmitted
C
It is always completely reflected
D
It disappears without any effect
B
It can be absorbed, reflected, or transmitted
A black shirt and a white shirt are placed in bright sunlight for the same amount of time. The black shirt becomes much warmer than the white shirt. Which explanation best describes why?
A
White fabric produces cold air that cools itself down automatically.
B
Black fabric reflects most of the light energy, so it stores more heat.
C
White fabric absorbs more light energy but somehow does not get hotter.
D
Black fabric absorbs more light energy and converts it into heat.
D
Black fabric absorbs more light energy and converts it into heat.
A closed container of gas is heated from 20∘C20∘C to 60∘C60∘C while the volume remains constant. Which statement best describes what happens to the gas on a particle level?
A
The number of gas particles increases, causing more collisions
B
The mass of each gas particle increases as it absorbs heat
C
Particles move faster and collide with the container walls more forcefully
D
Particles slow down and collide with the container walls less frequently
C
Particles move faster and collide with the container walls more forcefully
A compressed spring and a charged battery both store potential energy. How is the potential energy in a charged battery specifically related to chemical energy?
A
The battery’s potential energy is stored in the arrangement and composition of chemicals inside it.
B
The battery’s potential energy is stored only as thermal energy in the battery casing.
C
The battery’s potential energy is stored purely as sound energy produced during charging.
D
The battery’s potential energy is stored only as gravitational potential energy due to its height.
A
The battery’s potential energy is stored in the arrangement and composition of chemicals inside it.
Which of the following is a major environmental advantage of nuclear fission power compared to coal-fired power plants?
A
Nuclear plants do not pose any risk of accidental radioactive releases.
B
Nuclear plants produce no hazardous waste that must be stored long-term.
C
Nuclear plants require no cooling water and therefore have no impact on aquatic ecosystems.
D
Nuclear plants emit virtually no direct CO2CO2 during normal electricity generation.
D
Nuclear plants emit virtually no direct CO2CO2 during normal electricity generation.
The energy carried by electromagnetic radiation is directly proportional to its:
A
Speed
B
Wavelength
C
Amplitude
D
Frequency
D
Frequency
Which example best shows the transformation of light energy into another form of energy?
A
A solar panel generating electricity when exposed to sunlight.
B
A flashlight shining on a shiny metal surface that stays cool.
C
A mirror reflecting sunlight into a room.
D
Light passing through a clear window without any change.
A
A solar panel generating electricity when exposed to sunlight.
Which of the following best explains why placing your hand above a lit candle feels warmer than placing it beside the candle at the same distance?
A
Conduction is stronger above the candle than beside it
B
Thermal energy from the candle moves only upward and not sideways
C
Radiation does not travel sideways from the flame
D
Convection currents carry warmer air upward from the flame
D
Convection currents carry warmer air upward from the flame
Which situation best illustrates the Law of Conservation of Energy during a chemical reaction involving chemical energy?
A
In a battery-powered device, the electrical energy used is completely lost and does not reappear in any form.
B
In an endothermic reaction, energy is created from nothing to form new chemical bonds.
C
In a combustion reaction, chemical energy decreases in the fuel while thermal and light energy increase in the surroundings.
D
In an exothermic reaction, energy disappears as heat leaves the system into the surroundings.
C
In a combustion reaction, chemical energy decreases in the fuel while thermal and light energy increase in the surroundings.
In discussions of nuclear energy, what is the main concern associated with high-level radioactive waste from spent fuel?
A
It depletes atmospheric oxygen levels when stored in deep geological repositories.
B
It can be easily neutralized by mixing it with ordinary household chemicals.
C
It immediately vaporizes into the air, dispersing evenly across the globe.
D
It remains hazardous for very long timescales, requiring secure isolation from the environment.
D
It remains hazardous for very long timescales, requiring secure isolation from the environment.
Which device converts radiant energy from the Sun directly into electrical energy?
A
Hydroelectric dam
B
Geothermal plant
C
Solar panel
D
Wind turbine
C
Solar panel
Which statement best explains why we see a red apple as red in white light?
A
The apple does not interact with light at all; our brain just imagines the color.
B
The apple absorbs red wavelengths and reflects all others toward our eyes.
C
The apple reflects red wavelengths and absorbs many of the other visible wavelengths.
D
The apple produces its own red light without any need for external light energy.
C
The apple reflects red wavelengths and absorbs many of the other visible wavelengths.