NS T11 Gr 7

How does heat mainly travel through air?

• conduction

• convection

• radiation

• evaporation

Busisiwe placed her hands around the following containers filled with hot water. She was careful not to touch the containers. Her results will show that...

• the black bottle felt the hottest

• the white bottle felt the hottest

• The black bottle felt the coolest

• The black and the white bottle were the same temperature

What conclusion did Busisiwe reach from the previous experiment?

• shiny surfaces absorb heat best

• dark surfaces reflect heat best

• black surfaces transmit heat best

• black surfaces radiate heat best

Which of the following statements is true about solids that allow heat to pass through them?

• they are also called insulators

• they are also called heaters

• most metals are good conductors of heat

• mostly made of plastic

convection is:

• the way kinetic energy is transferred

• the transfer of heat when two objects are touching

• the transfer of heat energy across space

• the transfer of heat energy in a liquid or gas in a closed system

how do particles move in liquids?

• shake on the spot

• flow over and around each other

• bounce around in the container

• all of the above

how do particles move in gases?

• shake on the spot

• flow over and around each other

• bounce around in the container

• all of the above

In convection:

• warm particles rise, cool particles sink

• warm particles sink and cool particles rise

• both of the above

• none of the above

the flow of particles is called the:

• conduction current

• convection current

• radiation current

• heat current

what must the system have to transfer heat by conduction?

• a warm object

• good conductive material

• the cold object must be touching the warm object

• all of the above