10th Sep '25

Multiple Choice 2015-16

Question	Answer	Point
Why do we need energy?	It takes energy to do anything. Think of an object that does something, describe the energy it is showing.	It takes energy to do anything.
What are the 8 forms of energy?	The 8 simple forms of energy: Light Sound Chemical Kinetic (Movement) Electrical Gravitational Elastic Thermal (Heat) (Nuclear) (Magnetic)	The 8 simple forms of energy: Light Sound Chemical potential Kinetic (Movement) Electrical Gravitational potential Elastic potential Thermal (Heat) (Nuclear) (Magnetic)
What is the difference between a store of energy and a flow of energy?	These can be categorised into stores and flows of energy. (Tree Map) Stores of energy can be left and returned to and the energy still be there. Flows of energy travel from one place to another.	These can be categorised into stores and flows of energy. Stores of energy can be left and returned to and the energy still be there. Flows of energy travel from one place to another.
What are the stores of energy? What are the flows of energy?	The Stores of energy: - Gravitational potential - Elastic potential - Chemical potential - (Nuclear potential) - Kinetic - Thermal - Magnetic The Flows of energy are - Light - Sound - Electrical - Heating (These are all waves)	The Stores of energy: - Gravitational potential - Elastic potential - Chemical potential - (Nuclear potential) The Flows of energy are - Light - Sound - Kinetic (Movement) - Electrical - Thermal (Heat) - movement of particles
How is energy transferred? Name 4 examples.	Processes that involve energy transfer: - changing motion, - dropping an object, - completing an electrical circuit, - stretching a spring, - metabolism of food, - burning fuels	Energy can be transferred from place to place.
Does energy always stay in the same form? Explain your answer.	Energy can be transformed from one form to another. Usually into more than one form.	Energy can be transformed from one form to another. Usually into more than one form.
What is meant by 'conservation of energy'?	Energy cannot be created or destroyed but can be transformed or transferred from place to place.	Energy cannot be created or destroyed but can be transformed or transferred from place to place.
Why do we use energy transfer diagrams? Draw an energy transfer diagram for the energy transfers in a fan heater.	Energy transfer diagrams are used to transfers (and transforms) of energy. Energy transfer diagrams: - Stores of energy are written in boxes. - Flows of energy are written on arrows. - Places / objects are written at the end of arrows. - The final arrows need to point word 'surroundings'	Energy transfer diagrams are used to transfers (and transforms) of energy. Energy transfer diagrams: - Stores of energy are written in boxes. - Flows of energy are written on arrows. - Places / objects are written at the end of arrows. - The final arrows need to point word 'surroundings'
Which direction(s) does energy flow?	Energy flows from high energy (the store) to areas of low energy (the surroundings).	Energy flows from high energy (the store) to areas of low energy (the surroundings).
How is energy dispersed?	When energy is transferred it is always dispersed until it is evenly distributed in all places.	When energy is transferred it is always dispersed until it is evenly distributed in all places.
How does anything happen in terms of energy?	We harness the flow of energy from an area of high concentration to an area of low concentration. Analogy: water wheel	We can harness this flow to do something. Analogy: water wheel
What sorts of processes involve energy transfers? Give 3 examples.	Processes that involve energy transfer: - changing motion, - dropping an object, - completing an electrical circuit, - stretching a spring, - metabolism of food, - burning fuels	Processes that involve energy transfer: - changing motion, - dropping an object, - completing an electrical circuit, - stretching a spring, - metabolism of food, - burning fuels
What is meant by a more efficient device?	Some energy is useful and some is not useful, more efficient devices have more useful energy	Some energy is useful and some is not useful, more efficient devices have more useful energy
What do we measure the amount of energy transferred in?	Amount of energy transferred can be measured in Joules.	Amount of energy transferred can be measured in Joules.
Energy Transfer Joule Fuel	REVIEW of 2P.1	Review of 2P.1
Why do hot objects have more energy than cooler ones? How is this energy transferred?	heating and thermal equilibrium: temperature difference between 2 objects leading to energy transfer from the hotter to the cooler one, through - contact (conduction) or - radiation; such transfers tending to reduce the temperature difference;	Hot objects have more heat energy than cooler ones.
In which direction does heat energy flow?	Heat energy flows from hot objects to cooler ones.	Heat energy flows from hot objects to cooler ones.
When does heat energy stop flowing?	Heat energy stops flowing when objects are the same temperature.	Heat energy stops flowing when objects are the same temperature.
What do we call energy transfer through contact?	Heat energy can transfer through contact known as conduction.	Heat energy can transfer through contact known as conduction.
When does conduction occur?	Conduction occurs when fast moving (hot) particles collide with slower (cooler) particles.	Conduction occurs when fast moving (hot) particles collide with slower (cooler) particles.
Why does energy transfer in conduction?	Energy is passed on as the fast moving particles slow down as the slower particles speed up.	Energy is passed on as the fast moving particles slow down as the slower particles speed up.
How, other than conduction and convection, can heat energy transfer?	Heat energy can transfer through radiation.	Heat energy can transfer through radiation.
What is radiation described as?	Radiation is heat energy in the form of light.	Radiation is heat energy in the form of light.
What is convection? What substances does it occur in?	Convection is the (mass) movement of particles with heat energy. It only occurs in fluids.	Convection is the (mass) movement of particles with heat energy.
To what point do objects cool down to?	Hot objects always cool down until they reach the same temperature as their surroundings.	Hot objects always cool down until they reach the same temperature as their surroundings.
How do insulators work?	Insulators reduce the speed (rate of) energy transfer.	Insulators reduce the speed (rate of) energy transfer.
What is a better insulator - air or plastic?	A gas is a better insulator than a solid.	A gas is a better insulator than a solid.
Why is air a better insulator than plastic?	A gas is a better insulator than a solid because gas particles are further apart than in a solid. Therefore the collision of particles are less frequent.	A gas is a better insulator than a solid because gas particles are further apart than in a solid. Therefore the collision of particles are less frequent.
What are the best insulators?	Vacuums are the best insulators.	Vacuums are the best insulators.
Why are vacuums the best insulators?	Vacuums are the best insulators because there are no particles to collide in a vacuum.	Vacuums are the best insulators because there are no particles to collide in a vacuum.
Why do humans wear clothes to keep warm?	Layers of clothes or fur, trap air so that the particles can not convect away, while the air still reduces conduction by reducing collisions.	Layers of clothes or fur, trap air so that the particles can not convect away, while the air still reduces conduction by reducing collisions.

Mod	Number of Questions
0S	10
1B	10
1C	10
1P	10
BI	5