Solid State Physics-Elements of Superconductivity [GATE (Graduate Aptitude Test in Engineering) Physics (PE)]: Questions 5 - 7 of 12

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Question 5

Appeared in Year: 2007

Question MCQ▾

Variation of electrical resistivity with temperature of three solid is sketched (on different scales) in the figure, as curves and .

Which one of the following states describes the variations most appropriately?

Curves of Resistivity vs Temperature

Choices

Choice (4)Response

a.

is for a superconductor, and for a conductor.

b.

is for a superconductor, and R for a semiconductor.

c.

is for a superconductor, and for a conductor.

d.

is for a superconductor, and for a conductor.

Edit

Question 6

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.

Edit

Question 7

Appeared in Year: 2006

Question MCQ▾

Which one of the following statements about superconductor is not true?

Choices

Choice (4)Response

a.

A type superconductor exhibits Meissner effect up to the second critical magnetic field

b.

Type and type superconductor exhibit sharp fall in resistance at the superconducting transition temperature

c.

A type superconductor exhibits zero resistance up to the second critical magnetic field

d.

A type superconductor is completely diamagnetic

Edit