Conduction, convection and radiation

Answer Key - Grade 8 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   A teacher stirs warm soup with a metal spoon, and the handle gets warm. How did the heat travel, Ari?

   • Convection
   • Radiation
   • Conduction
2. 2.

   On a cold, still day, Esme feels the Sun warm one cheek. How does that heat travel from the Sun?

   • Convection in the air
   • Radiation
   • Conduction, passed along through air
3. 3.

   Jun holds a cold can of juice, and the hand feels cold. Which way does energy move?

   • Heat from the hand to the can
   • Nothing moves; it just feels cold
   • Cold from the can to the hand
4. 4.

   Kira drops ice into lemonade. Which way does energy move?

   • Heat from the lemonade into the ice
   • Heat from the ice into the lemonade
   • Cold from the ice into the lemonade
5. 5.

   On a winter day (0 °C, 32 °F, outside), Luz's classroom window feels cold. Which way does energy move?

   • Heat goes out through the glass
   • Cold comes in through the glass
   • No energy moves through glass
6. 6.

   During class, Milo watches a teacher's mug of water cool from 70 °C to 55 °C. By how many degrees did it drop?

   15 °C
7. 7.

   Noah reads that a teacher's cocoa cooled from 65 °C to 48 °C. By how many degrees did it drop?

   17 °C
8. 8.

   A sun-warmed rock is moved into the shade and cools from 35 °C to 27 °C, Pia records. By how many degrees did it drop?

   8 °C
9. 9.

   A metal bench and a wooden bench sit in the same shady park. The metal one feels colder to Ren. Why?

   • The metal is at a lower temperature
   • Metal moves heat from skin faster
   • Wood makes its own warmth
10. 10.

    A teacher stands a metal spoon and a wooden spoon in warm water. Which handle warms first, Zee?

    • The wooden one, since wood is warm
    • The metal one
    • Neither: metal stays cold