IAPS Unit D: Energy Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
What is the Law of Conservation of Energy? - CORRECT ANSWER It is the scientific
law that states that energy can't be created or destroyed, but can change from type to another.
D-25
What combination of mass and height of an object will give the greatest gravitational
potential energy? - CORRECT ANSWER Like in Act 54, "Drive a Nail" - the largest
mass and highest height has the greatest gravitational potential energy.
What does it mean if the efficiency of something is 20% - CORRECT ANSWER It
means that 20% of the energy is being used for its purpose (the other 80% is other energy).
Explain in terms of energy what happens when you open the door to a refrigerator. -
CORRECT ANSWER Heat transfers from hot to cold so the thermal energy from the
room goes IN the fridge.
What energy transformation takes place when a radio is plugged in and turned on? -
CORRECT ANSWER Electrical energy is transformed into sound energy.
What units are used to measure each of the following: volume and energy? - CORRECT
ANSWER Volume is measured in ml (milliliters).
Energy is measured in calories.
Make a list of renewable resources and another list of nonrenewable resources. - CORRECT
ANSWER Some renewable resources are; biomass, geothermal, hydroelectric, solar,
tidal harness, wind.
Some nonrenewable resources are: fossil fuels & nuclear. D-54
, If you feel something that is hot after being in use, what kind of energy is that? - CORRECT
ANSWER It is thermal energy.
Explain how conduction can be used to melt an ice cube. - CORRECT ANSWER Put
the ice directly next to something (conduction is the process by which energy is transferred
directly when materials touch each other.).
300 ml of hot chocolate at 85 degrees Celsius add 50 ml of cold milk at 5 degrees Celsius.
What's the approximate new temperature? 90, 85, 70, or 5? - CORRECT
ANSWER The approximate new temperature would be 70 degrees Celsius.
Describe absorbing and reflecting in terms of energy. - CORRECT
ANSWER Absorbing is when light can be captured by the object and transformed into
heat.
Reflecting is when light can be bounced off of the surface of the object.
How are metals used in making a chemical battery? - CORRECT ANSWER It is based
on the reactivity of the metal - transforms potential chemical energy into electical energy.
Compare an incandescent light bulb with a fluorescent one in terms of light and thermal
energy. - CORRECT ANSWER Both are comparable in light but incandescent give off
more thermal energy.
Explain why solar energy is not used more as an energy source. - CORRECT
ANSWER Solar energy is not used more because it is expensive , not efficient, all
places don't receive a lot of sunlight, and storing of it is difficult.
Explain series and parallel circuits in terms of how they light bulbs and the path that energy
or electricity flows. - CORRECT ANSWER Series run on a single path - one bulb goes
out, all bulbs don't work
Parallel run on multiple paths - one bulb goes out, all others still work
ACTUAL QUESTIONS AND CORRECT
ANSWERS
What is the Law of Conservation of Energy? - CORRECT ANSWER It is the scientific
law that states that energy can't be created or destroyed, but can change from type to another.
D-25
What combination of mass and height of an object will give the greatest gravitational
potential energy? - CORRECT ANSWER Like in Act 54, "Drive a Nail" - the largest
mass and highest height has the greatest gravitational potential energy.
What does it mean if the efficiency of something is 20% - CORRECT ANSWER It
means that 20% of the energy is being used for its purpose (the other 80% is other energy).
Explain in terms of energy what happens when you open the door to a refrigerator. -
CORRECT ANSWER Heat transfers from hot to cold so the thermal energy from the
room goes IN the fridge.
What energy transformation takes place when a radio is plugged in and turned on? -
CORRECT ANSWER Electrical energy is transformed into sound energy.
What units are used to measure each of the following: volume and energy? - CORRECT
ANSWER Volume is measured in ml (milliliters).
Energy is measured in calories.
Make a list of renewable resources and another list of nonrenewable resources. - CORRECT
ANSWER Some renewable resources are; biomass, geothermal, hydroelectric, solar,
tidal harness, wind.
Some nonrenewable resources are: fossil fuels & nuclear. D-54
, If you feel something that is hot after being in use, what kind of energy is that? - CORRECT
ANSWER It is thermal energy.
Explain how conduction can be used to melt an ice cube. - CORRECT ANSWER Put
the ice directly next to something (conduction is the process by which energy is transferred
directly when materials touch each other.).
300 ml of hot chocolate at 85 degrees Celsius add 50 ml of cold milk at 5 degrees Celsius.
What's the approximate new temperature? 90, 85, 70, or 5? - CORRECT
ANSWER The approximate new temperature would be 70 degrees Celsius.
Describe absorbing and reflecting in terms of energy. - CORRECT
ANSWER Absorbing is when light can be captured by the object and transformed into
heat.
Reflecting is when light can be bounced off of the surface of the object.
How are metals used in making a chemical battery? - CORRECT ANSWER It is based
on the reactivity of the metal - transforms potential chemical energy into electical energy.
Compare an incandescent light bulb with a fluorescent one in terms of light and thermal
energy. - CORRECT ANSWER Both are comparable in light but incandescent give off
more thermal energy.
Explain why solar energy is not used more as an energy source. - CORRECT
ANSWER Solar energy is not used more because it is expensive , not efficient, all
places don't receive a lot of sunlight, and storing of it is difficult.
Explain series and parallel circuits in terms of how they light bulbs and the path that energy
or electricity flows. - CORRECT ANSWER Series run on a single path - one bulb goes
out, all bulbs don't work
Parallel run on multiple paths - one bulb goes out, all others still work
