12. How does heat travel through the pan?
A. by radiation
B. by dispersion
C. by convection
D. by conduction

13. How does the heat travel through the soup?
A. by radiation
B. by dispersion
C. by convection
D. by conduction

14. Why you cannot feel the heat from the handle of the pan while cooking?

I. The handle is made of good insulator of heat
II. The handle has slow thermal conductivity
III. The handle has high thermal expansion

A. I and II only
B. I and III only
C. II and III only
D. I, II and III

15. When you stir a cup of hot chocolate, why does a metal teaspoon always feels hotter than a plastic one?
A. metal is better heat radiator
B. metal is at a higher temperature
C. metal has a greater density
D. metal is better heat conductor​