Semiconductors, Magnets, and Superconductors

What is the variation of conductivity with temperature in conductors?

• Decreases with temperature

• Increases with temperature

• Varies randomly

• Remains constant

What are the types of semiconductors?

• Positive and negative

• P-type and N-type

• Solid and liquid

• Metallic and non-metallic

What is the application of p-n junction in transistors?

• Detection of radio waves

• Generation of magnetic field

• Conversion of light into electricity

• Amplification of electrical signals

What is the Meissner effect in superconductors?

• Complete expulsion of magnetic field

• Variation of conductivity with temperature

• Increase in magnetic susceptibility

• Formation of permanent magnets

What is the classification of magnets based on magnetic susceptibility?

• Solid and liquid

• Diamagnetic, paramagnetic, and ferromagnetic

• Positive and negative

• Metallic and non-metallic

What is the variation of magnetic properties with temperature according to the Curie-Weiss law?

• No variation

• Linear

• Exponential

• Inverse

What is the theory that explains superconductivity through Cooper pairs?

• Theory of relativity

• Maxwell's equations

• Newton's laws of motion

• Bardeen-Cooper and Schrieffer theory

What are the examples of superconducting oxides?

• Copper and aluminum

• Iron and steel

• Lead and zinc

• Yttrium and barium

What is the application of photovoltaic cells?

• Generation of electricity from light

• Generation of electricity from wind

• Generation of electricity from heat

• Generation of electricity from sound

What is the domain theory related to in magnets?

• Superconductivity

• Classification of magnets based on magnetic susceptibility

• Formation of permanent magnets

• Variation of magnetic properties with temperature