What is superconductivity?
A
The ability of some materials to conduct electricity with zero resistance
B
High resistance to electrical flow
C
Partial conductivity at high temperatures
D
The ability to conduct heat without electricity
Analysis & Theory
Superconductivity is a phenomenon where certain materials exhibit *zero electrical resistance* below a critical temperature.
Who discovered superconductivity?
Analysis & Theory
Superconductivity was discovered in 1911 by *Heike Kamerlingh Onnes* while studying mercury at low temperatures.
What is the critical temperature (Tc) in superconductivity?
A
The temperature below which a material shows zero resistance
B
The temperature above which material melts
C
The temperature at which material burns
Analysis & Theory
The *critical temperature* is the temperature below which a material becomes superconducting.
Which of the following is a key property of superconductors?
B
Zero electrical resistance
Analysis & Theory
Superconductors exhibit *zero electrical resistance*, allowing current to flow without energy loss.
What is the Meissner effect?
A
Expulsion of magnetic fields from a superconductor
C
Absorption of magnetic fields
D
Generation of electricity
Analysis & Theory
The *Meissner effect* is the complete expulsion of magnetic fields from a superconducting material below its critical temperature.
Which material is a conventional superconductor?
Analysis & Theory
Mercury is a classical example of a *conventional superconductor* discovered by Onnes.
Superconductivity is destroyed if:
A
Temperature is raised above Tc
B
Magnetic field exceeds critical value
C
Both temperature and magnetic field exceed critical values
Analysis & Theory
Superconductivity ceases if *temperature or magnetic field exceeds their critical limits*.
Which of the following is an application of superconductivity?
Analysis & Theory
Superconductivity is used in *maglev trains, MRI machines, particle accelerators*, and other applications due to zero resistance and strong magnetic effects.
High-temperature superconductors operate at:
Analysis & Theory
High-temperature superconductors, like YBCO, have *critical temperatures around 90 K*, which is higher than conventional superconductors.
Why is superconductivity important in power transmission?
A
Reduces energy loss to zero
B
Allows faster electrons
Analysis & Theory
Superconductors can carry electricity without resistance, which *eliminates energy loss*, making power transmission highly efficient.