Physics Girl: Liquid Oxygen and Magnetism

What was Dianna's initial reaction to handling liquid oxygen?

• She was indifferent.

• She was confused.

• She was nervous and excited.

• She was disappointed.

What creates the magnetic field in the experiment?

• Static electricity

• Electromagnets

• Permanent magnets

• Solar power

Why does liquid oxygen hang between the magnetized metal pieces?

• Because of its paramagnetic properties

• Due to gravitational pull

• Due to the Leidenfrost effect

• Because of surface tension

What is the property of liquid oxygen that makes it react to magnetic fields?

• Ferromagnetism

• Diamagnetism

• Electromagnetism

• Paramagnetism

What happens to the mini-magnets in paramagnetic materials when the external magnetic field is turned off?

• They point in random directions.

• They disappear.

• They remain aligned.

• They become stronger.

What is the Curie point?

• The temperature at which iron becomes radioactive

• The temperature at which iron becomes a superconductor

• The temperature at which iron loses its magnetism

• The temperature at which iron melts

What happens to iron when it is heated past the Curie point?

• It becomes a liquid.

• It becomes more magnetic.

• It loses its magnetism.

• It changes color permanently.

What is the approximate Curie point of iron in Kelvin?

• 2000 Kelvin

• 500 Kelvin

• 1043 Kelvin

• 1500 Kelvin

What is the main focus of the sponsor, 23andMe?

• Liquid oxygen production

• Physics experiments

• DNA analysis

• Magnetic field research

How many pairs of chromosomes are in human DNA, as mentioned by 23andMe?

• 23 pairs

• 22 pairs

• 24 pairs

• 21 pairs