Energy Transfers questions

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Energy Transfers question collection

Review Energy Transfers questions for Physics, with correct answers shown and coverage across what does one joule (J) measure; choosing which unit is used for power; a 2\,\mathrm{kW} kettle and a 1\,\mathrm{kW} toaster are switched on for the same time. Which transfers more energy.

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Question 1

What does one joule (J) measure?
  1. Energy transferred
  2. Electric current
  3. Force
  4. Power rating

Question 2

Which unit is used for power?
  1. Watt (W)
  2. Joule (J)
  3. Newton (N)
  4. Coulomb (C)

Question 3

A \(2\,\mathrm{kW}\) kettle and a \(1\,\mathrm{kW}\) toaster are switched on for the same time. Which transfers more energy?
  1. The \(2\,\mathrm{kW}\) kettle
  2. The \(1\,\mathrm{kW}\) toaster
  3. They transfer equal energy
  4. It cannot be decided without their voltages

Question 4

What happens to the total energy in a closed system?
  1. It remains constant
  2. It falls as energy dissipates
  3. It rises as temperature rises
  4. It varies with each energy transfer

Question 5

Which process transfers thermal energy most in a solid metal rod?
  1. Conduction
  2. Convection
  3. Evaporation
  4. Diffusion

Question 6

Which energy resource is non-renewable?
  1. Natural gas
  2. Wind
  3. Solar
  4. Tidal

Question 7

What does loft insulation mainly reduce?
  1. Thermal energy transfer through the roof
  2. Thermal energy transfer through windows
  3. Electrical energy transfer through wiring
  4. Sound energy transfer through floors

Question 8

When a bicycle slows because of braking, what is energy mainly transferred from?
  1. From the bicycle's kinetic store to thermal stores
  2. From the brakes' thermal store to the kinetic store
  3. From the rider's chemical store to the kinetic store
  4. From the kinetic store to the bicycle's gravitational store

Question 9

What is meant by work done in physics?
  1. Energy transferred when a force moves an object
  2. Power used each second
  3. The total mass of an object
  4. Current flowing in a wire

Question 10

How can an ideal simple machine reduce the input force?
  1. By increasing the input distance
  2. By decreasing the input distance
  3. By increasing the output energy
  4. By decreasing the object's mass

Question 11

Which appliance uses the most energy in \(30\,\mathrm{min}\)?
  1. A \(1.8\,\mathrm{kW}\) hair dryer
  2. A \(600\,\mathrm{W}\) microwave
  3. A \(100\,\mathrm{W}\) phone charger
  4. A \(9\,\mathrm{W}\) LED lamp

Question 12

What does a kilowatt-hour (kWh) measure?
  1. Energy transferred
  2. Power
  3. Electric current
  4. Electrical charge

Question 13

Thermal energy transfers in which direction?
  1. Hotter object to cooler object
  2. Cooler object to hotter object
  3. Larger object to smaller object
  4. Denser object to less dense object

Question 14

Which action increases an object's gravitational potential energy store?
  1. Lifting it to a higher position
  2. Sliding it sideways at the same height
  3. Cooling it down
  4. Letting it fall

Question 15

What happens to a fuel's chemical energy store during combustion?
  1. It decreases as energy is transferred
  2. It increases as oxygen is absorbed
  3. It stays constant as temperature rises
  4. It changes directly into mass

Question 16

Which cup material is best for reducing energy transfer by heating from a hot drink?
  1. Polystyrene foam
  2. Copper
  3. Aluminium
  4. Steel

Question 17

Which energy store increases when a spring is stretched?
  1. Elastic potential
  2. Kinetic
  3. Chemical
  4. Nuclear

Question 18

How much energy does a \(1000\,\mathrm{W}\) kettle transfer in \(120\,\mathrm{s}\)?
  1. \(120000\,\mathrm{J}\)
  2. \(120\,\mathrm{J}\)
  3. \(1000\,\mathrm{J}\)
  4. \(12000\,\mathrm{J}\)

Question 19

A food label shows \(900\,\mathrm{kJ}\). What does this describe?
  1. The chemical energy available from the food
  2. The food's mass in kilograms
  3. The food's power rating in watts
  4. The food's temperature in degrees C

Question 20

What makes an energy resource renewable?
  1. It is replenished naturally as it is used
  2. It is manufactured whenever demand rises
  3. It is stored underground before use
  4. It produces electricity without a generator

Question 21

A portable fan uses \(40\,\mathrm{W}\) of power for \(1800\,\mathrm{s}\). How much energy is transferred?
  1. \(72\,\mathrm{kJ}\)
  2. \(7.2\,\mathrm{kJ}\)
  3. \(720\,\mathrm{kJ}\)
  4. \(72000\,\mathrm{W}\)

Question 22

Which process transfers thermal energy by the movement of a fluid?
  1. Convection
  2. Conduction
  3. Radiation
  4. Reflection

Question 23

How can thermal energy transfer through empty space?
  1. By infrared radiation
  2. By conduction
  3. By convection
  4. By diffusion

Question 24

What does a Sankey diagram represent?
  1. Useful and wasted energy transfers
  2. Forces and their directions
  3. Current and voltage in a circuit
  4. Temperature changes over time

Question 25

Which is the useful energy transfer in an electric fan?
  1. Electrical to kinetic
  2. Electrical to thermal
  3. Electrical to light
  4. Chemical to kinetic

Question 26

What is efficiency?
  1. Useful energy output divided by total energy input
  2. Total energy output divided by useful input
  3. Energy lost divided by time
  4. Power multiplied by distance

Question 27

Why does the trapped air in double glazing reduce heat transfer?
  1. It conducts poorly and cannot circulate far
  2. It conducts well and carries heat outside
  3. It generates heat between the panes
  4. It raises the temperature of the outer pane

Question 28

Which resource releases carbon dioxide when burned?
  1. Coal
  2. Wind
  3. Solar
  4. Tidal

Question 29

Where does dissipated energy go?
  1. Into thermal stores in the surroundings
  2. Into a useful store in the device
  3. Back into the original energy source
  4. Into the object's mass store

Question 30

A device transfers \(600\,\mathrm{J}\) in \(3\,\mathrm{s}\). What is its power?
  1. \(200\,\mathrm{W}\)
  2. \(1800\,\mathrm{W}\)
  3. \(603\,\mathrm{W}\)
  4. \(0.005\,\mathrm{W}\)

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Review Energy Transfers questions for Physics, with correct answers shown and coverage across what does one joule (J) measure; choosing which unit is used for power; a 2\,\mathrm{kW} kettle and a 1\,\mathrm{kW} toaster are switched on for the same time. Which transfers more energy.

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