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?
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. |
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. |
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 |