4 th Grade Chapter 9 Test

A(n) ________ is an object that attracts certain metals, mainly iron. Magnet

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

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

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

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

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

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

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

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

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

Where is the magnetic force strongest in this magnet? a.At the poles b.At the top of the curve c.At the north pole d.At the south pole

What will happen if these magnets are moved together? a.They will attract each other b.They will repel each other c.They will rotate d.They will point north

What energy change occurs in a generator? a.Electrical energy to motion b.Electrical energy to heat energy c.Heat energy to motion d.Motion to electrical energy

How is a permanent magnet different than an electromagnet? a.It attracts materials made from iron b.It has poles c.It has a magnetic field d.It can’t be turned on and off

In a furnace chemical energy is changed into a.Electrical energy b.Heat energy c.Nuclear energy d.Potential energy

What is an electromagnet? a.Static electricity b.A compass needle c.Electricity produced by a magnet d.A magnet produced by electricity

What happens when something is transformed? a.It moves across a boundary b.It gets created c.It changes its form d.It disappears

When you turn on a light in your home, electrical energy changes into a.Heat energy b.Chemical energy and heat energy c.Light energy and heat energy d.Light energy

What do you call the parts of bar magnets that attract paper clips? a.The center b.The poles c.Equator d.The force

How can you increase the strength of an electromagnet? a.Add more magnetic material b.Add more paper clips c.Take away some magnetic material d.Add more batteries

An electric motor changes electric energy into a.Light energy b.Nuclear energy c.Chemical energy d.motion

What is a generator? a.A device that uses electric energy to make things cold b.A device that converts the energy in falling water into motion c.A device that converts electrical energy into motion d.A device that converts motion into electrical energy