Electricity and Magents Unit Review

When Izla and Mia rub balloons on their hair and then try to bring them close to each other, the balloons repel each other. This indicates that the balloons have the same charges.

• True

• False

Answer explanation

When balloons rubbed on hair repel each other, it indicates they have the same charges, leading to the correct choice of True.

Tags

NGSS.MS-PS2-3

Opposite charges on a magnet

• repel

• attract

Answer explanation

Like a magnet attracts, the correct choice is 'attracts' as magnets have the property of attracting certain materials towards them.

Tags

NGSS.MS-PS2-3

During the science class, Arya, Abigail, and Lily are learning about magnets. They are asked about the properties of magnets. What are these properties?

• Attracts iron and materials containing iron

• One end of the magnet will always point north

• Attracts or repels other magnets

• All of the above

Answer explanation

The correct choice is 'All of the above' because magnets attract iron, point north, and attract or repel other magnets.

Where is the strongest magnetic field on this magnet?

• A

• B

• C

• D

Answer explanation

The strongest magnetic field is at point A on this magnet.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What are the two ways to increase the magnetic field of an electromagnet?

• Use a coil made of copper and a core of aluminum

• Change the battery and use a thicker wire

• Increase the electric current and the number of turns in the coil

• Increase the size of the core and reduce the electric current

Answer explanation

Increase the electric current and the number of turns in the coil

Tags

NGSS.MS-PS2-3

Which of the following allows free movement of electric charges?

• Insulators

• Conductors

• Semiconductors

• Resistors

Answer explanation

Conductors allow free movement of electric charges due to their ability to conduct electricity easily.

What do opposite charges do?

• Repel

• Leave

• Attract

• Leak

Answer explanation

Opposite charges attract each other due to the electrostatic force between them.

Tags

NGSS.MS-PS2-3

Neutrons have an electric charge.

• True

• False

Answer explanation

Neutrons do not have an electric charge, they are neutral particles composed of quarks and gluons.

Opposite charges attract, and like charges repel.

• True

• False

Accumulation of charges on a body is called?

• Static electricity

• Parallel circuit

• Series circuit

• Static discharge

Answer explanation

Accumulation of charges on a body is called static electricity, making it the correct choice among the options provided.