Directions: Read the following questions carefully. Choose the letter of the correct answer.
16. Which of the following materials are good conductors of heat?
A. Ceramic cups, disposable glass
B. Nail, safety pin
C. Glass, pitcher of water
D. Tiles, blanket
17.All the molecules of an object pass heat from one object to another until they are all.
A. Cold
B. Hot
C. Tiny
D. Warm
18. A __________ is any item or material that provides a path for energy to flow.
A. Atom
B. Conductor
C. Electric
D. Molecules
19. To choose the best materials for use in electrical applications, some engineers specialize in understanding the conducting and insulating characteristics of materials. To carry electricity through buildings, electrical engineers use copper wire. Why?
A. Cooper is a good conductor
B. Copper is good insulator
C. Copper is hot
D. Copper is hard
20. Keep people from being harmed, they incorporate rubber and plastics for objects used around
electrical current. For example, electrical tools often have rubber handles, and many wires have a plastic
coating. Why?
A. Plastic and rubber is useful
B. Plastic and rubber is good insulator
C. Plastic and rubber s good conductor
D. Plastic and rubber is soft
Share
Answer:
16:C
17:b
18:d
19:a
20A
Explanation:
sana maka tulonh