Solid State Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 54 - 57 of 68

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Question 54

Solid State Physics

Appeared in Year: 2008

Question

MCQ▾

Metallic monovalent sodium crystallizes in body centered cubic structure. If the length of the unit cell is , the concentration of conduction electrons in metallic sodium is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 55

Solid State Physics

Appeared in Year: 2007

Question

MCQ▾

The solid phase of an element follows van der Waals bonding with inter-atomic potential , where and are constants. The bond length can be expressed as –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 56

Solid State Physics
Type-I and Type-II Superconductors

Appeared in Year: 2007

Question

MCQ▾

A solid superconductor is placed in a external magnetic field and then cooled below its critical temperature. The superconductor –

Choices

Choice (4)Response

a.

Expels out its magnetic flux because the surface current induces a field in the direction opposite to the applied magnetic field.

b.

Expels out its magnetic flux because it behaves like an anti – ferromagnetic material.

c.

Expels out its magnetic flux because it behaves like a paramagnetic material.

d.

Retains its magnetic flux because the surface current supports it.

Question 57

Appeared in Year: 2007

Question

MCQ▾

In a powder diffraction pattern recorded from a face – centered cubic sample using rays, the first peak appears at . The second peak will appear at –

Choices

Choice (4)Response

a.

b.

c.

d.

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