Energy and Heat
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Forms of Energy (Kinetic and Potential)
SubtopicForms of Energy (Kinetic and Potential) under Energy and Heat for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of the following would have the least gravitational potential energy?
A.A pebble on the ground
B.A pebble on a chair
C.A pebble on a rooftop
D.A pebble in an airplane
- 2.
The total mechanical energy of an object is equal to:
A.B.C.D. - 3.
A match contains energy stored in its head. This is:
A.Kinetic energy
B.Gravitational potential energy
C.Chemical potential energy
D.Elastic potential energy
- 4.
If you double the mass of a moving object but keep its speed the same, its kinetic energy will:
A.Stay the same
B.Double
C.Quadruple
D.Decrease
- 5.
A student is jumping on a trampoline. As they move through the cycle shown in the diagram, at which position is the energy of the system stored primarily as Elastic Potential Energy ()?
A.Position A: The student is at the highest point of their jump
B.Position B: The student is falling through the air and has not yet touched the mat
C.Position C: The student has landed and the trampoline mat is stretched to its lowest point
D.Position D: The student has just left the surface of the mat and is accelerating upwards
- 6.
Which of these best explains why a slide at a park feels hot on a sunny day?
A.The slide is losing potential energy
B.The slide is absorbing radiant energy from the sun and converting it to thermal energy
C.The slide is creating energy from the friction of kids sliding
D.The slide is reflecting all the light so it stays cool
- 7.
When you use a hand-crank flashlight, what is the initial form of energy you provide?
A.Electrical energy
B.Kinetic energy
C.Light energy
D.Thermal energy
- 8.
A box is sliding at on a rough floor and comes to a stop. How much thermal energy was produced by friction?
A.B.C.D. - 9.
A arrow is shot from a bow with of energy. A arrow is shot with of energy. Which arrow has the higher velocity?
A.The arrow
B.The arrow
C.They have the same velocity
D.Velocity cannot be determined
- 10.
If you are told that an object has 'negative' gravitational potential energy relative to a certain reference point, what does this mean?
A.The object has no mass.
B.The object is moving faster than the speed of light.
C.The object is below the chosen reference level (e.g., in a hole).
D.The object is losing kinetic energy rapidly.
Download the worksheet for Energy and Heat - Forms of Energy (Kinetic and Potential) to practice offline. It includes additional chapter-level practice questions.
Energy Transformations and Conservation
SubtopicEnergy Transformations and Conservation under Energy and Heat for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of the following describes a material that does NOT allow heat to flow through it easily?
A.Conductor
B.Radiator
C.Insulator
D.Reflector
- 2.
A ball is thrown straight up into the air. What happens to its kinetic energy as it reaches its highest point?
A.It increases
B.It transforms into gravitational potential energy
C.It turns into chemical energy
D.It stays the same
- 3.
Which energy transformation is most common in a power drill?
A.Electrical to kinetic
B.Chemical to light
C.Sound to potential
D.Nuclear to thermal
- 4.
If two objects at different temperatures are in contact, heat will flow from:
A.The cooler object to the warmer object
B.The smaller object to the larger object
C.The warmer object to the cooler object
D.The heavier object to the lighter object
- 5.
An object is thrown vertically upwards. As it rises, what happens to its energy (ignoring air resistance)?
A.Kinetic energy increases and Potential energy decreases
B.Both Kinetic and Potential energy increase
C.Kinetic energy decreases and Potential energy increases
D.Both Kinetic and Potential energy decrease
- 6.
The greenhouse effect involves the atmosphere trapping heat. Which form of heat transfer is most directly involved in energy coming from the Sun to the Earth's surface?
A.Conduction
B.Convection
C.Radiation
D.Evaporation
- 7.
Which set of materials is correctly ordered from the best conductor to the best insulator?
A.Copper, Wood, Air
B.Air, Wood, Copper
C.Wood, Copper, Air
D.Copper, Air, Wood
- 8.
A laptop battery gets warm while the laptop is being used. According to energy conservation, this heat energy is:
A.Added energy from the surrounding room.
B.A transformation of a portion of the battery's stored chemical/electrical energy that is not performing computing work.
C.Energy created by the software running on the screen.
D.Potential energy being stored for later use by the cooling fan.
- 9.
A ball is held meters above the ground. It is then moved to meters above the ground. How has its potential energy changed, and what was required to make this change?
A.It doubled; work was done on the ball by an external force.
B.It stayed the same; no work was done because the ball is still stationary.
C.It quadrupled; energy was created by the height increase.
D.It halved; the ball is further from the center of the Earth.
- 10.
When burning wood in a campfire, the energy released as heat and light originally came from:
A.The match used to start the fire.
B.Carbon dioxide in the atmosphere.
C.Nuclear fusion in the core of the Sun, captured via photosynthesis.
D.The oxygen molecules in the air.
Download the worksheet for Energy and Heat - Energy Transformations and Conservation to practice offline. It includes additional chapter-level practice questions.
Methods of Heat Transfer (Conduction, Convection, Radiation)
SubtopicMethods of Heat Transfer (Conduction, Convection, Radiation) under Energy and Heat for Grade 7 IB.
Preview questions (no answers)
- 1.
Which statement best describes what happens during heat transfer?
A.Heat moves from a cold object to a hot object
B.Heat moves from a hot object to a cold object
C.Heat stays inside the object and never moves
D.Cold moves from a cold object to a hot object
- 2.
A 'thermal' is a column of rising air used by birds and gliders to stay in the air. This is caused by:
A.Conduction
B.Convection
C.Radiation
D.Friction
- 3.
When a metal object is heated, what is actually being transferred between the atoms?
A.Protons
B.Kinetic energy
C.Matter
D.Coldness
- 4.
What is the primary method of heat transfer being used by a microwave oven to heat food?
A.Conduction
B.Convection
C.Radiation
D.Insulation
- 5.
A lizard is basking in the desert to increase its body temperature. The diagram shows different pathways (1, 2, and 3) through which thermal energy is transferred from the environment to the lizard. Which sequence correctly identifies these methods of heat transfer?
A.1: Radiation, 2: Conduction, 3: Convection
B.1: Conduction, 2: Radiation, 3: Convection
C.1: Radiation, 2: Convection, 3: Conduction
D.1: Convection, 2: Conduction, 3: Radiation
- 6.
A radiator heats a room by warming the air near it. This air then moves towards the ceiling while cooler air moves in to take its place. This cycle is called:
A.A radiation beam
B.A conduction path
C.A convection current
D.An insulation layer
- 7.
What is the primary method of heat transfer being prevented by a plastic lid on a coffee cup?
A.Conduction through the air.
B.Convection (by stopping warm air and steam from escaping).
C.Radiation from the surface of the liquid.
D.Conduction through the sides of the cup.
- 8.
Which of the following is an example of an industrial application of convection?
A.The tall chimney on a factory that allows hot waste gases to rise and be carried away by high-altitude winds.
B.The use of a silver-lined suit by a volcano researcher to reflect intense heat.
C.The use of a wooden handle on a soldering iron to protect the user's hand.
D.The application of a ceramic coating on a space shuttle to prevent it from burning up during re-entry.
- 9.
Why do some people wrap a potato in aluminum foil before baking it in an oven?
A.To reflect the potato's internal moisture back inside and to conduct heat evenly across the surface.
B.To prevent infrared radiation from reaching the potato so it cooks slower.
C.To create a vacuum between the foil and the potato to stop conduction.
D.Because aluminum foil is a perfect insulator that keeps the heat from the oven away from the skin.
- 10.
Two objects, X and Y, are placed in a vacuum. Object X is at and Object Y is at . Heat is transferred from X to Y. What is the method of transfer?
A.Radiation
B.Conduction
C.Convection
D.Evaporation
Download the worksheet for Energy and Heat - Methods of Heat Transfer (Conduction, Convection, Radiation) to practice offline. It includes additional chapter-level practice questions.
Renewable and Non-renewable Energy Resources
SubtopicRenewable and Non-renewable Energy Resources under Energy and Heat for Grade 7 IB.
Preview questions (no answers)
- 1.
Which energy source involves burning garbage to generate electricity?
A.Geothermal
B.Nuclear
C.Waste-to-Energy (Biomass)
D.Solar
- 2.
What is the primary source of energy that causes the wind to blow?
A.The Earth's core
B.The Sun
C.The Moon
D.The Oceans
- 3.
Why is it important to develop renewable energy technologies?
A.Because fossil fuels are being used faster than they form
B.Because renewable energy is always cheaper right now
C.Because fossil fuels do not produce any energy
D.Because renewable energy is only for scientists
- 4.
Which of the following is an example of an 'inexhaustible' resource?
A.Coal
B.Natural gas
C.Sunlight
D.Uranium
- 5.
What is 'peaking power' (or peak load), and which resource is often used to provide it because it can be turned on quickly?
A.The lowest energy use at night; solar is used.
B.The highest energy demand during the day; natural gas or hydro is often used.
C.The energy used to climb mountains; wind is used.
D.The point where a battery is 100% full; nuclear is used.
- 6.
Which of these is a social/economic argument for transitioning to renewable energy?
A.Renewables never break down.
B.It reduces a country's dependence on imported fuels and creates 'green' jobs.
C.Renewables make the sun shine brighter.
D.Non-renewable fuels are actually becoming more plentiful.
- 7.
How do 'control rods' work in a nuclear reactor?
A.They are burned to provide backup heat.
B.They absorb neutrons to regulate the rate of the fission reaction.
C.They spin to generate electricity directly.
D.They pump water into the reactor core.
- 8.
In the context of the IB curriculum's focus on 'Systems,' a power plant can be viewed as an open system. What is the primary 'output' that is considered an environmental 'externality'?
A.The electrical energy sent to the city.
B.The waste thermal energy and chemical emissions released into the surrounding environment.
C.The steel used to build the turbine blades.
D.The wages paid to the power plant workers.
- 9.
A hydrogen fuel cell combines hydrogen and oxygen to produce electricity. What is the only 'exhaust' or byproduct of this chemical reaction?
A.Carbon dioxide ()
B.Pure water ()
C.Methane ()
D.Nitrogen oxides ()
- 10.
Why is the 'Specific Heat Capacity' of the working fluid important in a solar thermal collector?
A.It determines how much light is reflected off the surface of the fluid.
B.It determines how much thermal energy the fluid can carry for every degree its temperature increases.
C.It determines the speed at which the fluid flows through the pipes.
D.It determines the color of the fluid, which affects light absorption.
Download the worksheet for Energy and Heat - Renewable and Non-renewable Energy Resources to practice offline. It includes additional chapter-level practice questions.