Q1
Heat from the Sun reaches Earth by:
Aradiation
Bconduction
Cconvection
Dreflection
CBSEClass 7 (CBSE)ScienceCh 7 · Topic 1
Modes of Heat Transfer
Learning the three ways heat travels - conduction, convection and radiation.
Core concept
A metal spoon left in hot soup gets warm through conduction, as heat passes from particle to particle. Boiling water shows convection, as hot water rises to the top while cooler water sinks to be heated at the bottom, creating a circulating current. Radiation is how the Sun's heat reaches Earth across empty space, and it's also why standing near a fire feels warm even without touching it or the surrounding air directly.
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• Conduction: heat transfer through direct contact, mainly in solids/metals.
• Convection: heat transfer through the movement of heated liquid or gas.
• Radiation: heat transfer as electromagnetic waves, needs no medium.
• The Sun's heat reaches Earth through radiation, across empty space.