chapter 8 pretest

1.

5 points

What makes an electromagnet so useful?

its current

its power

the fact that you can control the size of the magnetic field

its size

2.

5 points

What should you do if you are caught in an electrical storm?

stop, drop, and roll

jump in a lake

hide under a tree

go indoors immediately

3.

5 points

What is the rule that describes how charged particles behave?

opposites attract, likes repel

opposites attract

opposites repel, likes attract

opposite repel

4.

5 points

If one light bulb in a series circuit blows out, what happens to the other bulbs?

they flicker

they blink slowly

they will not light up at all

they remain lit

5.

5 points

Lora rubbed a ballon on the carpet. Which of these objects will most likely be attracted to the balloon?

toothpick

strand of hair

rubber band

paper clip

6.

5 points

What's an insulator?

a material through which electricity doesn't flow easily

a material through which electricity flows easily

a light bulb

all of these

7.

5 points

What is voltage?

strength of a power source

current

circuit

resistance

8.

5 points

What is the movement of electricity called?

convection current

a magnetic current

an electric current

none of these

9.

5 points

How does electricity flow in a series circuit?

in one direction

in an arc

in a straight line

in five directions

10.

5 points

Why are electrical wires often made of copper?

Copper is an attractive metal

copper is plentiful

copper is a good insulator

copper is a good conductor

11.

5 points

What are the ends of a magnet called?

breakers

Poles

end points

fields

12.

5 points

How is static electricity created?

by the poles of a magnet

by an imbalance of positively and negatively charged particles

by mechanical energy

by particles that have neutral charges

13.

5 points

What would happen if two objects were both negatively charged?

they would create an electric current

They would attract each other.

they would create a magnetic field.

they would repel each other.

14.

5 points

What might contribute to the Earth being like a giant magnet.

its copper core

its large oceans

its iron core

its small size

15.

5 points

The buildup of electrical charge is called

insulator

electricity

static electricity

conductor

16.

5 points

What is electricity?

another word for magnetism

the energy of positively charged particles

The energy of a generator

the energy of charged particles

17.

5 points

How does electricity flow in a parallel circut?

in one parallel line

none of these

in one direction

in more than one direction

18.

5 points

Magnetic force becomes stronger when magnets are

different sizes

farther apart

both metal

closer together

19.

5 points

After you rub your feet on the carpet, you touch a metal doorknob and you get a shock. What is this shock called?

magnet

discharge

static electricity

voltage

20.

5 points

Where is the magnetic field the strongest?

on one end

at the curve

at the poles

in the middle