GATE Physics: Questions 240 - 241 of 290

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Question number: 240

» Mathematical Physics » Linear Vector Space » Basis

Appeared in Year: 2011

MCQ▾

Question

Consider a cylinder of height h and radius a , closed at both ends, centered at the origin, Let r=i^x+j^y+k^z be the position vector and n^ a unit vector normal to the surface. The surface integral srn^ds over the closed surface of the cylinder is

Ellipse c Ellipse c: Ellipse with foci A, B passing through CEllipse c_1 Ellipse c_1: Ellipse with foci A_1, B_1 passing through C_1Segment f Segment f: Segment [A, A_1] Segment g Segment g: Segment [B, B_1] Vector u Vector u: Vector [D, E] Vector u Vector u: Vector [D, E] Vector v Vector v: Vector [D, F] Vector v Vector v: Vector [D, F] Vector w Vector w: Vector [D, G] Vector w Vector w: Vector [D, G] Z text1 = “Z”Y text1_1 = “Y”X text1_2 = “X”O text1_3 = “O”

a Cylinder of Closed Ends

In figure a cylinder of height h and radius a, closed at both ends, centered at the origin.

Choices

Choice (4) Response
a.

3πa2h

b.

Zero

c.

2πa2h

d.

2πa2(a+h)

Question number: 241

» Solid State Physics » Elements of Superconductivity » Type-I and Type-II Superconductors

Appeared in Year: 2013

MCQ▾

Question

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

( h is the Planck’s constant and e is the electronic charge)

Choices

Choice (4) Response
a.

Presence of Meissner effect

b.

Quantization of magnetic flux in superconducting ring in the unit of (he)

c.

Different critical temperature for isotopes

d.

Presence of energy gap at temperature below the critical temperature

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