Calculate in units of the frequency of the rotational lines of
H2 resulting from the transitions to the excited state characterized
by the quantum number J 4. If the bond length of H2 is
0.07417 nm, determine the spacing between the lines. The mass
of hydrogen atom is 1.673 × 10- 27 kg. 10
5. What is solar cell Explain the design requirements, construction
and working of solar cell. 30
What is the energy of the characteristics X-ray emitted
from a tungsten target when an electron drops from M shell
to a vacancy in K-shell 20
OR
What is Zener diode How a Zener diode works as a voltage
regulator Draw its I-V characteristic curve. 15
Explain the working of OR, NOT, NAND and X-OR gates
using diodes and truth tables. 15
Explain the working of half-adder and full-adder using appropriate
logic circuits and truth tables. 20
6. What is super conductivity Write the characteristics of
superconductors. 15
Explain the differences between superconductors and conductors.
20
Explain the three configurations of a transistor. Describe how
a transistor works as an amplifier and an oscillator. 15
OR
What are elementary particles and how they are classified
20
Explain the working of a transmitter, receiver in television with
a block diagram. 30

HRI-28359 4 400

Total No. of Printed Pages 4 Roll No. ............................ 1[CCE.M]1
Physics-II

Time Three Hours Maximum Marks 300

INSTRUCTIONS


Answers must be written in English.


The number of marks carried by each question is indicated at the end of the question.


The answer to each question or part thereof should begin on a fresh page.

Your answers should be precise and coherent.


The part/parts of the same question must be answered together and should not be interposed between answers to other questions.


Candidates should attempt all questions.


If you encounter any typographical error, please read it as it appears in the text book.
(viii) Candidates are in their own interest advised to go through the General Instructions on the back side of the title page of the Answer Script for strict adherence.
No continuation sheets shall be provided to any candidate under any circumstances.
HRI-28359 1 Contd.
Candidates shall put a cross on blank pages of Answer
Script.
No blank page be left in between answer to various questions.

1. State and explain the Coulomb's law and Gauss's law of electrostatics. 10

Deduce Coulomb's law from Gauss's law. 20


Derive an expression for the electric field due to uniformly charged sphere. 20


OR


What feature of atomic structure determines the dia or paramagnetic nature of an element Explain the domain theory of ferromagnetism. 30


Distinguish between dia, para and ferromagnetic substances. 20


2. What is meant by dielectric Deduce Poisson's and Laplace's equations for a homogeneous dielectric. 20
An uncharged conducting sphere of radius is placed in a uniform electric field E0. If the sphere carries a charge then deduce an expression for potential at any point at a distance from its centre. 30
OR


State the laws of Faraday's and Lenz's which deals with the production of induced emf. 15


Describe the theory of LCR parallel resonant circuit and obtain an expression for resonant frequency. 20


A rectangular coil of dimensions 10×18 cm having 600 turns is rotated in a magnetic field of 200×10-4 Wb 2 at 1200 rpm. Find the emf induced when it makes an angle of 60º with the field. 15


HRI-28359 2 Contd.
3.











4.







HRI-28359
Explain the phenomenon of radioactivity. Distinguish between natural and artificial radioactivity. 20 Obtain an expression for mean lifetime of a radioactivity element in terms of half lifetime. 15 A radioactive source, in the form of metallic sphere of radius 10-2 m emits ß particle at the rate of 1011 particles per second. The source is electrical insulated. What will be the time required for its potential to be raised by 4 volts assuming 60% of emitted ß particles escape from the source 15
OR
Explain the construction, theory and working of cyclotron.
20 How do the relativistic effects limit the acceleration of electrons to high energies in cyclotron 15
An electron accelerated by a potential difference of 2 kV moves in a uniform magnetic field at an angle . 30º to the vector B whose magnitude is 30 mT. Calculate the pitch of the helical trajectory. 15 Explain the Zeeman effect using classical ideas. Distinguish between normal and anomalous Zeeman effects. 30 Find the minimum magnetic field needed for the normal Zeeman effect to be observed in a spectral line of 400 nm wavelength when a spectrometer whose resolution is 0.001 nm is used. 20
OR
What is Raman effect Explain theoretically the observed characteristics of Raman spectrum of a diatomic molecule.
20 How Raman spectrum is used to explain the structure of a molecule 20
3 Contd.