Physics · May / June 2020 · Paper 12 · Question 23

Four metal containers, with identical dimensions, are filled with water at 90 °C. All the faces, except one, of each container are covered in a very good insulator. The one exposed face on each container is painted either black or white. In which container does the water cool the fastest?

1. Alarge face painted black
2. Blarge face painted white
3. Csmall face painted black
4. Dsmall face painted white

As printed in the paper