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B NSA192002 Pages:3

Reg No.:_. Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER B.TECH DEGREE EXAMINATION(2019 SCHEME), DECEMBER 2019

Course Code: PHT 100
Course Name: ENGINEERING PHYSICS A

(2019-Scheme)
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 3 marks.
1 List any six points to compare electrical oscillator with a mechanical (3)
oscillator.
2 Distinguish between transverse and longitudinal waves. Give one example (3)
for each.
3 When a medium of || F 1 is introduced in the Newton’s ring set up, what (3)

happens to the diameter of interference pattern? Explain it with the help of

relevant equation.

4 Give 3 differences between interference and diffraction. (3)
೨ State Heisenberg’s Uncertainty principle and write the three uncertainty (3)
relations .
6 Explain the optical properties of nanomaterials. (3)
7 Distinguish between magnetic induction and magnetising field. (3)
8 Derive the equation of continuity for time varying fields. (3)
9 Show that superconductors are perfect diamagnets. (3)
10 Distinguish between step index and graded index fibres. (3)
PART छ
Answer one full question from each module, each question carries 14 marks
Module-I
11 a) Set up the differential equation for a forced harmonic oscillator and solve it. (10)
b) ^ transverse wave on a_ stretched string is described ‏لاط‎ (4)

y(x,t)=2sin(20t+0.021x+m/6) where x and y are in cm and t is in second.
Obtain (1)Amplitude (2)Initial phase (3)speed (4)frequency

12 a) Derive an expression for the fundamental frequency of a transverse wave in a (10)
stretched string.

b) A sitar wire is under tension of 40 N and length of the bridge is 80cm. A 10m (4)

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