Unit 8 Test Review: Electricity and Magnetism

What charge does an electron have?

• negative (-)
• positive (+)
• neutral or no charge (0)

True or False A positively charged object has gained protons

• True
• False

True or False A negatively charged object has gained electrons

• True
• False

Which one of these objects is a good insulator

• Copper wire
• Plastic

• Aluminum 
• Gold

What method of static charging is shown in this picture

• Polarization
• Friction
• Induction
• Conduction

If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that

• friction destroyed electrons in the rod.
• the silk has become negatively charged.
• protons have moved to the rod.
• glass attracts more protons.

Charging by ____ occurs when electrons are transferred from one object to another by direct contact.

• reduction
• induction
• conduction
• friction

Ms Jo Jo rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

• The balloons will repel each other.
• The balloons will attract each other.
• The balloons will become positively (+) charged.
• The balloons will pop.

What happens when you touch a metal doorknob after rubbing your shoes on the carpet?

• The doorknob sends a burst of electric current into your body
• Millions of electrons go from your finger into the doorknob
• The doorknob sends millions of electrons into your finger
• our finger becomes negatively charged

In a series circuit  with 4 bulbs:

• a switch is never used
• all of the bulbs become dimmer if another bulb is added
• There are many paths for electricity to take
• the remaining 3 bulbs stay lit if one burns out