The Way Science Works 105-1 mid-term Exam

( 20 points each )

1. Why ultra-high voltage is used when sending electricity from power plant to cities ?

2. What is the strength and weakness of cement (concrete) as a material for buldings?

3. What Alum (Aluminium Sulfate) has to do with our city life ?

4. It is said "No metals in Microwave", but microwave ovens are made of metal, isn't that contrdictory ?

5. Why Inerter (variable-frequency) air conditioner save energy ?