Multiple Choice Questions (MCQ) on Superconductivity

Multiple Choice Questions (MCQ) on Superconductivity

 

In superconductivity the conductivity of a material becomes

  1. Zero
  2. Finite
  3. Infinite
  4. None of the above

(Ans:c)

 

In superconductivity, the electrical resistance of material becomes

  1. Zero
  2. Infinite
  3. Finite
  4. All of the above

(Ans:a)

 

The temperature at which conductivity of a material becomes infinite is called

  1. Critical temperature
  2. Absolute temperature
  3. Mean temperature
  4. Crystallization temperature

(Ans:a)

 

In superconductors, the Fermi energy level is

  1. Below the ground state
  2. Midway between the ground state and first excited state
  3. Above first excited state
  4. At first excited state

(Ans:b)

 

The superconducting state is perfectly _____ in nature.

  1. Diamagnetic
  2. Paramagnetic
  3. Ferromagnetic
  4. Ferromagnetic

(Ans:a)

 

Which of the following are the properties of superconductors?

  1. They are diamagnetic in nature
  2. They have zero resistivity
  3. They have infinite conductivity
  4. All of the above

(Ans:d)

 

The minimum amount of current passed through the body of superconductor in order to destroy the superconductivity is called

  1. Induced current
  2. Critical current
  3. Eddy current
  4. Hall current

(Ans:b)

 

The energy required to break a cooper pair is ___ of the energy gap of superconductor.

  1. One half
  2. Equal to
  3. Twice
  4. Thrice

(Ans:b)

 

The copper pair has

  1. Equal and opposite momenta
  2. Equal and opposite spin
  3. Unequal and same spin

Which of the above are true?

  1. Only i
  2. Only ii
  3. i & ii
  4. i & iii

 

The binding energy for a cooper pair is

  1. 10^-2 eV
  2. 10^-4 eV
  3. 10^-6 eV
  4. 10^-8 eV

(Ans:b)

 

There are three important lengths which enter the theory of superconductivity except

  1. London penetration length
  2. Intrinsic coherence length
  3. Normal electron mean free length
  4. Mean path length

(Ans:d)

 

The magnetic lines of force cannot penetrate the body of a superconductor, a phenomenon is known as

  1. Isotopic effect
  2. BCS theory
  3. Meissner effect
  4. London theory

(Ans:c)

 

Which of the following conductor has highest critical temperature?

  1. Aluminium
  2. Zinc
  3. Molybdenium
  4. Tin

(Ans:d)