4th Grade Chapter 9 Test

1
4th Grade Chapter 9 Test
2
A(n) ________ is an object that attracts certain
metals, mainly iron.

• Magnet

3
An object that keeps its magnetism for a long
time is a(n)__________.

• Permanent magnet

4
A(n) _________ loses its magnetism after a short
time.

• Temporary magnet

5
The areas on a magnet where the force of a magnet
is greatest are called the ___________.

• Magnetic poles

6
The space in which the force of a magnet can act
is called its _________.

• Magnetic field

7
A(n) ________ is an instrument that senses
magnetic north.

• Compass

8
A(n) _________ is a display of lights in the sky,
near Earth's poles.

• Aurora

9
A strong temporary magnet that uses electricity
to produce magnetism is a(n) ________.

• Electromagnet

10
A(n) _________ is a device that uses magnetism to
convert energy of motion into electrical energy.

• Generator

11
A(n) ________ is a device that changes electrical
energy to energy of motion.

• Motor

12
Where is the magnetic force strongest in this
magnet?

1. At the poles
2. At the top of the curve
3. At the north pole
4. At the south pole

13
What will happen if these magnets are moved
together?

1. They will attract each other
2. They will repel each other
3. They will rotate
4. They will point north

14
What energy change occurs in a generator?

1. Electrical energy to motion
2. Electrical energy to heat energy
3. Heat energy to motion
4. Motion to electrical energy

15
How is a permanent magnet different than an
electromagnet?

1. It attracts materials made from iron
2. It has poles
3. It has a magnetic field
4. It cant be turned on and off

16
In a furnace chemical energy is changed into

1. Electrical energy
2. Heat energy
3. Nuclear energy
4. Potential energy

17
What is an electromagnet?

1. Static electricity
2. A compass needle
3. Electricity produced by a magnet
4. A magnet produced by electricity

18
What happens when something is transformed?

1. It moves across a boundary
2. It gets created
3. It changes its form
4. It disappears

19
When you turn on a light in your home, electrical
energy changes into

1. Heat energy
2. Chemical energy and heat energy
3. Light energy and heat energy
4. Light energy

20
What do you call the parts of bar magnets that
attract paper clips?

1. The center
2. The poles
3. Equator
4. The force

21
How can you increase the strength of an
electromagnet?

1. Add more magnetic material
2. Add more paper clips
3. Take away some magnetic material
4. Add more batteries

22
An electric motor changes electric energy into

1. Light energy
2. Nuclear energy
3. Chemical energy
4. motion

23
What is a generator?

1. A device that uses electric energy to make things
   cold
2. A device that converts the energy in falling
   water into motion
3. A device that converts electrical energy into
   motion
4. A device that converts motion into electrical
   energy