CSIR Physical Sciences: Questions 141 - 143 of 389

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Question number: 141

» Condensed Matter Physics » Band Theory of Solids » Metals

Appeared in Year: 2012

MCQ▾

Question

The experimentally measured transmission spectra of metal, insulator and semiconductor thin films are shows in the figure. It can be inferred that I, II and III correspond respectively, to – (June)

 Plot of Transmission spectra v/s Wavelength

Plot of Transmission Spectra v/s Wavelength

In figure graph of experimentally measured transmission spectra of metal, insulator and semiconductor thin films are shown.

Choices

Choice (4) Response
a.

Semiconductor, metal and insulator

b.

Insulator, semiconductor and metal

c.

Metal, semiconductor and insulator

d.

Insulator, metal and semiconductor

Question number: 142

» Mathematical Methods of Physics » Linear Ordinary Differential Equations of First & Second Order

Appeared in Year: 2012

MCQ▾

Question

Let y(x) be a continuous real function in the range 0 and 2π , satisfying the in homogeneous differential equation:

sinxd2ydx2+cosxdydx=δ(xπ2).

The value of dydx at the point x=π2 . (June)

Choices

Choice (4) Response
a.

Has a discontinuity of 13

b.

Is continuous

c.

Has a discontinuity of 1

d.

Has a discontinuity of 3

Question number: 143

» Electromagnetic Theory » Electrostatics: Gauss's Law and Its Applications

Appeared in Year: 2012

MCQ▾

Question

A point charge q of mass m is kept at a distance d below a grounded infinite conducting sheet which lies in the xy – plane. For what value of d will the charge remains stationary? (December)

Choices

Choice (4) Response
a.

qmgπε0

b.

There is no finite value of d

c.

mgρε0q

d.

q4mgπε0

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