Multiple questions on Magnetism - Grade 9 Physics (H)

What do we call the region around a magnet where it exerts a magnetic force?

• Magnetic zone

• Magnetic field

• Magnetic sphere

• Magnetic realm

Answer explanation

The region around a magnet where it exerts a magnetic force is known as a magnetic field. It is the correct choice among the options provided.

Maya is trying to do what with a material?

• Magnetizing it

• Demagnetizing it

• Inducing it

• Changing its polarity

Answer explanation

The process of removing magnetization from a material is called demagnetization, making it the correct choice among the options provided.

What is the process of turning a non-magnetic material into a magnet called?

• Magnetization

• Demagnetization

• Induction

• Polarity

Answer explanation

The correct process of making a non-magnetic material into a magnet is called magnetization, where the material becomes magnetized and gains magnetic properties.

What is the term for a material that is neither attracted to nor repelled by a magnet?

• Diamagnetic

• Paramagnetic

• Nonmagnetic

• Antiferromagnetic

Answer explanation

The term for a material that is neither attracted to nor repelled by a magnet is 'Nonmagnetic'. It does not interact with magnetic fields.

Which type of magnetism is like a magnet party where all the atoms are dancing in the same direction?

• Diamagnetism

• Paramagnetism

• Ferromagnetism

• Antiferromagnetism

Answer explanation

Ferromagnetism is exhibited by materials where the magnetic moments of neighboring atoms align in the same direction.

The magnet is not attracted to materials such as:

• Stainless steel

• Plastic

• Rubber

• All of it

Answer explanation

Faraday's Law states that the magnetic flux through a closed surface is zero.

A permanent magnet should lose no more than ______ of its magnetic strength over a period of _______ - 

provided it is cared for properly.

• 2 % / 2 years

• 20 % / 200 years

• 1 % / 100 Years

• 50 % / 5 years

Answer explanation

The term for the turning effect produced by a magnetic field on a magnetic dipole is called Magnetic torque.

Which material can Mia use to create a magnetic masterpiece?

• Wood

• Aluminum

• Iron

• Plastic

Answer explanation

Iron is easily magnetized due to its atomic structure that allows its electrons to align and create a magnetic field.

What is the SI unit of magnetic field strength?

• Watt

• Ampere

• Tesla

• Joule

Answer explanation

The SI unit of magnetic field strength is Tesla.

What do we call a material that can keep its magnetism even after being magnetized and taken out of the magnetic field?

• Temporary magnet

• Permanent magnet

• Electromagnet

• Ferromagnet

Answer explanation

A permanent magnet is a material that can retain its magnetism after being magnetized and removed from the magnetic field, distinguishing it from temporary magnets, electromagnets, and ferromagnets.