Energy Transfers questions

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Energy Transfers question collection

Review Energy Transfers questions for Physics, with correct answers shown and coverage across energy stores and the transfers between them; conduction, convection and radiation; insulation and reducing unwanted transfers.

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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

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 4

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

Question 5

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

Question 6

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 7

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 8

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 9

Which appliance uses the most energy in \(30\,\mathrm{min}\)?
  1. A 1800 W hair dryer
  2. A 600 W microwave
  3. A 100 W phone charger
  4. A 9 W LED lamp

Question 10

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

Question 11

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 12

What happens to a fuel's chemical energy store during combustion?
  1. It decreases
  2. It increases
  3. It stays constant
  4. It is destroyed

Question 13

Which cup material best reduces energy transfer from a hot drink?
  1. Polystyrene foam
  2. Copper
  3. Aluminium
  4. Steel

Question 14

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

Question 15

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 16

A food label shows \(900\,\mathrm{kJ}\). What does this describe?
  1. The chemical store the food supplies
  2. The mass of the food in kilograms
  3. A power rating in watts
  4. The temperature of the food

Question 17

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 18

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 19

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

Question 20

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

Question 21

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 22

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 23

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

Question 24

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 25

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. \(0.005\,\mathrm{W}\)

Question 26

Which equation links electrical energy, power and time?
  1. (E = Pt)
  2. (E = P/t)
  3. (E = P+t)
  4. (E = t/P)

Question 27

A \(60\,\mathrm{W}\) lamp is used for \(10\,\mathrm{s}\). How much energy is transferred?
  1. \(600\,\mathrm{J}\)
  2. \(6\,\mathrm{J}\)
  3. \(60\,\mathrm{J}\)
  4. \(6000\,\mathrm{J}\)

Question 28

Which unit do electricity bills use to charge for energy?
  1. Kilowatt-hour
  2. Kilowatt
  3. Watt-second
  4. Volt-ampere

Question 29

A 2 kW heater runs for 3 hours. How many kilowatt-hours does it use?
  1. 6 kWh
  2. 1.5 kWh
  3. 0.67 kWh
  4. 2 kWh

Question 30

A ball rolls down a slope and speeds up. What explains why it speeds up?
  1. The pull of gravity on it
  2. Energy pushing it along
  3. Its kinetic store growing
  4. Energy flowing into it

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Review Energy Transfers questions for Physics, with correct answers shown and coverage across energy stores and the transfers between them; conduction, convection and radiation; insulation and reducing unwanted transfers.

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