1. attract
2. repel
3. have no effect on
4. orbit

each other.

Q 2 - Friction between hair or fur and a rubber balloon will cause:

1. electrons
2. protons
3. neutrons
4. atoms

to move from the hair to the balloon.

Q 3 - The outer charges orbiting the center of the atom right are:

1. neutrons
2. electrons
3. protons
4. plasma

Q 4 - Objects can be charged by:

1. rubbing them
2. suspending them
3. placing them near generators
4. heating them

- When you charge a balloon by rubbing it on your hair, it picks up extra electrons and has a negative charge.
- Holding it near a neutral object will make the charges in the object move.
- If that neutral object is a conductor, many electrons move easily to the other side, as far away from the balloon as possible.
- If the object is a insulator, the electrons in the atoms and molecules can only move a little to one side, away from the balloon.
- In both cases there are more positive charges closer to the negative balloon and the balloon sticks, because opposites attract (until the electrons on the balloon leak off).
- Neutral and positively charged objects work the same.

Q 5 - A charged object will always:

1. attract
2. repel
3. move around
4. have no effect on

an uncharged object.

Q 6 - Like charged objects will:

1. repel
2. attract
3. move around
4. have no effect on

each other.

Q 7 - What are the three dots on the outer rings of the picture at the right?:

1. electrons
2. atoms
3. protons
4. neutrons

Q 8 - Electrons in an atom are held very loosely unlike the nucleus. Materials which allow electrons to move freely through them are:

1. conductors
2. insulators
3. resistors
4. capacitors

Q 9 - Which of these would not be a good conductor of an electrical current:

1. iron
2. paper clip
3. salt water
4. rubber

Q 10 - This animations shows:

1. electrons moving from atom to atom
2. static electricity in silicon
3. proton exchange between atoms
4. splitting of atoms

Q 11 - This animation shows that:

1. the magnet is inducing an electric current in the copper wire
2. static electricity is being produced
3. there is no measurable current flowing in the copper wire
4. the north and south poles of the magnet are attracting each other

Q 12 - This animation does NOT show that:

1. electrons are moving away from the carbon rod and attaching to the can exterior
2. protons are moving away from the carbon rod to the zinc can
3. a flow of electrons is being produced as electrons move from the zinc can to the top of the carbon rod
4. a carbon wire is linking the positive and negative terminals of the battery

Q 13 - Study the circuit drawing to the right. Which of the two following pictures matches the circuit sketch?

1. Below Left
2. Below Right

1. circuit
2. generator
3. electromagnet
4. galvanometer

works.

You make a hypothesis that the strength of an electro- magnet depends on the number of batteries in the circuit.
Which variable should you change to check your hypoth- esis?

1. size of the nail
2. number of batteries
3. number of paper clips that you wish to attract
4. number of copper wire turns around the nail

Q 15 - The object at the right is a/an:

1. galvanometer
2. electromagnet
3. generator
4. resistor

Q 16 - If you remove one of the bulbs in this circuit to the right, what would you expect to see?

1. The left bulb will go out
2. The left bulb will get brighter
3. The left bulb will get dimmer
4. The left bulb will not change

Q 17 - The illustration to the right is a photoelectric cell. What is it most like?

1. a galvanometer
2. an electromagnet
3. a battery
4. a generator