Condensed Matter Physics (CSIR Physical Sciences): Questions 4 - 6 of 16

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Question number: 4

» Condensed Matter Physics » Superfluidity

Appeared in Year: 2014

MCQ▾

Question

The following data is obtained in an experiment that measures the viscosity η as a function of molecular weight M for a set of polymers.

List of data obtained to measure viscosity

In table, the list of data is obtained in an experiment to measure the viscosity is given.

M(Da)

η(kPas)

990

0.28±0.03

5032

30±2

10191

250±10

19825

2000±200

The relation that best describes the dependence of η on M is – (June – 2014)

Choices

Choice (4) Response

a.

η~M3

b.

η~M49

c.

η~M32

d.

η~M2

Question number: 5

» Condensed Matter Physics » Drude Model of Electrical and Thermal Conductivity

Appeared in Year: 2013

MCQ▾

Question

Using the frequency dependent Drude formula, what is the effective kinetic inductance of a metallic wire that is to be used as a transmission line? [In the following, the electron mass is m , density of electrons is n , and the length and cross – sectional area of the wire are l and A respectively. ] (June)

Choices

Choice (4) Response

a.

mAne2l

b.

Zero

c.

mlne2A

d.

mAne2l2

Question number: 6

» Condensed Matter Physics » Bonding of Solids

Appeared in Year: 2014

MCQ▾

Question

The van der Waals’ equation of state for a gas is given by, (P+aV2)(Vb)=RT Where P, V and T represent the pressure, volume and temperature respectively, and a and b are constant parameters. At the critical point, where all the roots of the above cubic equation are degenerate, the volume is given by, (June – 2014)

Choices

Choice (4) Response

a.

a9b

b.

3b

c.

8a27bR

d.

a27b2

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