Solid State Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 14 - 16 of 68

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Question 14

Appeared in Year: 2013

Question

MCQ▾

A phosphorous doped silicon semiconductor (doping density: ) is heated from to . Which one of the following statements is CORRECT?

Choices

Choice (4)Response

a.

Position of Fermi level moves towards middle of energy gap

b.

Position of dopant level moves towards middle of energy gap

c.

Position of dopant level moves towards conduction band

d.

Position of Fermi level moves towards conduction band

Question 15

Solid State Physics

Appeared in Year: 2013

Question

MCQ▾

A lattice has the following primitive vectors : . The reciprocal lattice corresponding to the above lattice is –

Choices

Choice (4)Response

a.

BCC lattice with cube edge of

b.

FCC lattice with cube edge of

c.

FCC lattice with cube edge of

d.

BCC lattice with cube edge of

Question 16

Solid State Physics
Type-I and Type-II Superconductors

Appeared in Year: 2013

Question

MCQ▾

Considering the BCS theory of superconductors, which one of the following statements is NOT CORRECT?

( is the Planck՚s constant and is the electronic charge)

Choices

Choice (4)Response

a.

Presence of energy gap at temperature below the critical temperature

b.

Presence of Meissner effect

c.

Quantization of magnetic flux in superconducting ring in the unit of

d.

Different critical temperature for isotopes

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