8th Grade Science

An object that produces a magnetic field, attracting certain materials like iron, nickel, and cobalt is called a _______.

• Magnet

• Battery

• Conductor

• Insulator

Which of the following is a type of magnet that retains magnetism over time?

• Temporary Magnet

• Permanent Magnet

• Electromagnet

• None of the above

Magnets that become magnetized in the presence of a magnetic field, such as paperclips, are called _______ magnets.

• Temporary

• Permanent

• Electromagnetic

• Natural

Which type of magnet is created by electric current flowing through a coil of wire, often with a ferromagnetic core?

• Permanent Magnet

• Temporary Magnet

• Electromagnet

• None of the above

Every magnet has a north and south pole. Like poles repel; opposite poles attract.

• True

• False

The area around a magnet where magnetic forces can be detected is called the _______ field.

• Magnetic

• Electric

• Gravitational

• Thermal

What is a wave?

• A push or pull acting on an object

• A disturbance that transfers energy through space or matter

• The area around a magnet

• The distance between crests

Which type of wave requires a medium (e.g., sound waves, water waves)?

• Mechanical Waves

• Electromagnetic Waves

• Both A and B

• None of the above

Waves that do not require a medium, such as light waves and radio waves, are called _______ waves.

• Electromagnetic

• Mechanical

• Sound

• Seismic

What is the distance between successive crests or troughs in a wave called?

• Frequency

• Amplitude

• Wavelength

• Force