11. When light bounces off a smooth and shiny surface, the process that occurs is
a. reflection
b. refraction
c. transmission d. polarization
12. Objects that allow light to pass through them are
a. glass
b. transparent
c. translucent
d. opaque
13. in which of the following situations do you think current will flow?
a. closed circuit b. open circuit c. broken circuit d. short circuit
14. Why does the bulb light up?
a. The bulb becomes hot.
c. Electricity moves from the bulb to the dry cell
b. Electricity moves through a complete circuit. d. The electricity is collected in the wire that heats up the
15. What will happen if part of the circuit is not properly connected?
a. Electricity will flow.
c. Electrons will continue to flow
b. Electricity will flow to the appliance. d. No electricity will flow through the wire
16. How do we describe a conductor of electricity? It is a material that...
a. allows the free electrons to flow easily through it.
b. has extra free electrons on its surface
c. has no free electrons that can move freely
d. prevents the surplus electrons from moving out the wire.
17. Why is the wire used in an electromagnet coiled?
a. It has more force.
c. It controls the field of attraction
b. It makes the electromagnet stronger, D. It controls the flow of electricity
18. Which of the following can make an electromagnet stronger?
a. adding more dry cells
cincreasing the number of turns in the coil of wire
b. using a core with bigger diameter
d. all of these
19. Which of the following devices makes use of electromagnets?
a. electric belt b. electric buzzer
c telephone
d. all of the glyn
20. Which one of the following​