Science MCQs

Heated fluid rises cools and sinks creating a circular current.

Birds use rising warm air currents (convection) to glide without flapping.

Uneven heating creates convection currents in the air causing wind.

Radiation transfers heat through electromagnetic waves needing no medium.

Space is a vacuum so solar heat travels by radiation.

Dull black surfaces absorb more radiant heat than light or shiny surfaces.

Good absorbers are also good radiators; black surfaces radiate heat well.

It uses vacuum to stop conduction/convection and shiny walls to reduce radiation.

Plastic is an insulator preventing heat transfer to the hand.

Light colors reflect radiant heat keeping the body cooler.