PH133 II semester B.E. EEE Model Question Paper by RajVmu

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MODEL PAPER

B.E. DEGREE EXAMINATION.

Second Semester

Electrical and Electronics Engineering

PH 133 — PHYSICS II

Time : Three hours                                                Maximum : 100 marks

PART A — (10  2 = 20 marks)

1.    Calculate the electric potential at a point at a distance 0.53 Å from a proton.

2.    Write down the equation of continuity. What does it represent?

3.    Explain dual nature of matter.

4.    What is meant by free particle?

5.    Mention one characteristics each of atomic spectra and molecular spectra.

6.    The Q value of a reaction is found to be negative. Explain its significance.

7.    What are symmetry elements?

8.    Calculate the longest wavelength that can be used to analyse rock salt crystal
of spacing d = 2.82 Å in the first order.

9.    Mention the basic principle of X–ray radiography.

10.   Name the two basic inspection methods adopted in thermography.

PART B — (5  16 = 80 marks)

11.   (i)    Write down the Schrodinger equation for the wave function  (x ) of a
particle of mass m in an infinitely deep potential well of one dimension,
given by V ( x )  0 for 0  x  a, V ( x )   otherwise and solve the same.
(12)

(ii)   Represent graphically the energy levels of a particle in a one dimensional
box.                                                                    (4)
12.   (a)   (i)    Derive an expression for the capacity of a cylindrical capacitor
without and with a dielectric.                                    (8 + 4)

(ii)   A capacitor of 5  F with a potential of 6 V shares its charges with
another capacitor of 8  F at a potential of 3 V. Estimate the loss of

energy involved in the sharing of charges.                            (4)

Or

(b)   (i)    Modify Maxwell's equations of time varying electric and magnetic
fields to suit free space and hence develop wave equation for
transverse electric and magnetic fields in free space.            (4 + 8)

(ii)   What is known as Poynting vector? What does it explain?           (2 + 2)

13.   (a)   Discuss, in detail, any four quantum numbers associated with a spinning
electron.                                                           (4  4 = 16)

Or

(b)   Describe, in detail, with necessary theory the liquid drop model of a
nucleus. How does the theory predict alpha and beta emission property of
a nucleus?                                                             (12 + 4)

14.   (a)   (i)    Derive an expression for d–spacing of parallel planes of Miller
indices (h, k, l) in a simple cubic unit cell of side ‘a’.          (12)

(ii)   Calculate the d–spacing of (121) planes in a simple cubic unit cell of
edge 5 nm.                                                            (4)

Or

(b)   (i)    Describe with suitable diagram edge dislocations and screw
dislocations in crystal lattice.                                  (4 + 8)

(ii)   Discuss Burgers vector for edge dislocation.                          (4)

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15.   (a)   (i)    Explain the steps involved in liquid penetrant inspection.       (5)

(ii)   What are the two methods of magnetisation followed in magnetic
inspection technique?                                            (3)

(iii) What are the differences between X–radiography and gamma

Or

(b)   (i)    Draw a block diagram of ultrasonic flaw detector and explain the
function of each one of its components.                      (6 + 6)

(ii)   Explain ‘A–Scan’ used in ultrasonics.                            (4)

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