GATE (Graduate Aptitude Test in Engineering) Physics: Questions 237 - 240 of 659

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Question 237

Appeared in Year: 2011

Question

MCQ▾

The semi – empirical mass formula for the binding energy of nucleus contains a surface correction term. This term depends on the mass number A of the nucleus as –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 238

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 239

Appeared in Year: 2011

Question

MCQ▾

Consider a cylinder of height and radius , closed at both ends, centered at the origin, Let be the position vector and a unit vector normal to the surface. The surface integral over the closed surface of the cylinder is

A Cylinder of Closed Ends

Choices

Choice (4)Response

a.

Zero

b.

c.

d.

Question 240

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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