Why are fossil fuels considered non-renewable?

• They are expensive to extract

• They will run out one day

• They are made from water

• They are renewable

Which gas is mainly produced by burning fossil fuels?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

What does the term "infinite energy resources" refer to?

• Resources that never replenish

• Resources that quickly replenish themselves

• Resources that are finite

• Resources that are non-renewable

Which method of heat transfer can occur in a vacuum?

• Conduction

• Convection

• Radiation

• Insulation

What is the biggest source of radiant heat?

• The Earth

• The Moon

• The Sun

• Fire

Which of the following is NOT directly heated by the sun?

• Space

• Air temperature

• Water

• Soil

Which type of heat transfer involves direct contact?

• Radiation

• Conduction

• Reflection

• Refraction

What is the main advantage of using radiant heaters in sports halls?

• High energy consumption

• Low air temperature requirement

• High air temperature requirement

• Complex installation

What is the unit of conductivity in the context of conductive heat transfer?

• W/mK

• J/s

• m²K/W

• K/W

How is thermal resistance (R) calculated?

• By multiplying thickness by conductivity

• By dividing thickness by conductivity

• By adding thickness and conductivity

• By subtracting conductivity from thickness