Superconductivity: Delve into the World of Zero Resistance

Question 1

The Meissner effect is the:

Accepted Answer

Expulsion of magnetic fields from a superconductor

Answer

Sudden increase in electrical resistance when a superconductor is cooled below its critical temperature

Answer

Formation of Cooper pairs in a superconductor

Answer

Hysteresis loop observed in superconducting materials

Question 2

Examples of Type I superconductors include:

Accepted Answer

Lead

Answer

Niobium-titanium alloy

Answer

Magnesium diboride

Answer

Iron-based superconductors

Question 3

The critical magnetic field in a superconductor is the:

Accepted Answer

Maximum magnetic field strength that can be applied without destroying superconductivity

Answer

Magnetic field strength that induces a current in a superconductor

Answer

Magnetic field strength that causes a superconductor to exhibit hysteresis

Answer

Magnetic field strength that is required to levitate a superconductor

Question 4

Which material exhibits Type II superconductivity, characterized by partial penetration of magnetic fields?

Accepted Answer

Niobium-titanium alloy

Answer

Lead

Answer

Mercury

Answer

Iron

Question 5

The Josephson effect refers to:

Accepted Answer

Supercurrent flow across an insulating barrier between superconductors

Answer

Superconductivity loss in the presence of magnetic fields

Answer

Increased electrical resistance above critical temperatures

Answer

Expulsion of magnetic fields from superconductors

Question 6

Which property is exclusive to Type II superconductors?

Accepted Answer

Flux pinning

Answer

Zero electrical resistance below the critical temperature

Answer

Meissner effect

Answer

Critical magnetic field

Question 7

Which material listed below is NOT known to exhibit superconducting properties?

Accepted Answer

Copper

Answer

Mercury

Answer

Lead

Answer

Niobium

Question 8

The Meissner effect is associated with superconductivity and describes:

Accepted Answer

Expulsion of magnetic fields from the interior of the superconductor

Answer

Enhancement of magnetic fields within the superconductor

Answer

Increase in electrical resistance of the superconductor

Answer

Decrease in thermal conductivity of the superconductor

Question 9

Which of the following is a type of high-temperature superconductor?

Accepted Answer

Yttrium barium copper oxide (YBCO)

Answer

Mercury

Answer

Lead

Answer

Tin

Question 10

Which of the following is a potential application of superconductivity in the medical field?

Accepted Answer

Magnetic resonance imaging (MRI)

Answer

Computerized tomography (CT) scans

Answer

X-ray imaging

Answer

Ultrasound imaging

Question 11

The BCS theory of superconductivity primarily explains superconductivity based on:

Accepted Answer

Cooper pairs

Answer

Phonons

Answer

Magnons

Answer

Excitons

Question 12

Josephson junctions are:

Accepted Answer

Devices that exhibit superconductivity at two connected points

Answer

Materials that have zero electrical resistance at high temperatures

Answer

Superconductors with a high critical magnetic field

Answer

Devices that convert electrical energy into mechanical energy

Question 13

Define the London penetration depth and explain its relevance in understanding the behavior of magnetic fields in superconductors.

Accepted Answer

The characteristic distance over which an applied magnetic field penetrates a superconductor.

Answer

The temperature at which a material transitions from its normal to superconducting state.

Answer

The maximum current density a superconductor can sustain without losing its superconducting properties.

Question 14

To be considered a superconductor, which property must the material possess?

Accepted Answer

Zero electrical resistance

Answer

High thermal conductivity

Answer

Diamagnetism

Answer

Normal resistance

Question 15

Which material is an example of a Type II superconductor?

Accepted Answer

NbTi

Answer

Pb

Answer

Hg

Answer

Nb

Question 16

The Meissner effect refers to the:

Accepted Answer

Complete expulsion of magnetic fields from a superconductor

Answer

Attraction of magnetic fields into a superconductor

Answer

Partial expulsion of magnetic fields from a superconductor

Question 17

Which application of superconductivity is found in the medical field?

Accepted Answer

Magnetic Resonance Imaging (MRI)

Answer

High-speed trains

Answer

Electric motors

Answer

Solar panels

Question 18

The critical magnetic field (Hc) of a superconductor is the field strength at which:

Accepted Answer

Superconductivity is destroyed

Answer

Superconductivity is enhanced

Answer

The Meissner effect is suppressed

Question 19

The Cooper pair theory explains:

Accepted Answer

The formation and behavior of electron pairs in superconductors

Answer

The dependence of Tc on material composition

Answer

The high critical current density of superconductors

Answer

The expulsion of magnetic fields from superconductors

Question 20

High-temperature superconductors (HTS) are materials that exhibit superconductivity:

Accepted Answer

At temperatures higher than the boiling point of nitrogen

Answer

At temperatures lower than the boiling point of helium

Answer

With a critical magnetic field higher than conventional superconductors