Upper Sec Heat transfer and conduction

In a science fair, Daniel demonstrated the concept of thermal energy. The judges were impressed and asked him, 'What is the SI unit of thermal energy?' What would be his answer?

What is temperature?

• A. Degree of force

• B. Degree of hotness or coldness

• C. Degree of speed

• D. Degree of pressure

How is heat transferred from a region of higher temperature to a region of lower temperature?

• A. Convection

• B. Radiation

• C. Conduction

What is conduction?

• D. Transfer of heat through absorption

• C. Transfer of heat through vibration/collision of particles

• A. Transfer of heat through radiation

• B. Transfer of heat through convection

What are the mediums through which conduction can occur?

• D. Solid, Gas and Plasma

• C. Liquid, Gas and Plasma

• B. Solid, Liquid and Plasma

• A. Solid, Liquid and Gas

Reorder the following in slowest to fastest speed of heat transfer by conduction.

• Gas

• Solid

• Liquid

Why are metals better conductors than non-metals?

• D. Metals have lower melting point

• C. Metals have higher density

• B. Metals have free electrons which can move about through the rod

• A. Metals have more particles

In a science class, Lily asked the teacher, 'In which state of matter is conduction fastest?'

• D. Plasma

• C. Gas

• B. Liquid

• A. Solid

Why can't conduction occur in a vacuum?

• C. Because vacuum is too cold

• D. Because vacuum is too hot

• B. Because particles in a vacuum are too far apart

• A. Because there are no particles in a vacuum

What are conductors?

• D. Materials that do not allow heat to be transferred at all

• A. Materials that allow heat to be transferred slowly by conduction

• B. Materials that do not allow heat to be transferred by conduction

• C. Materials that allow heat to be transferred quickly by conduction