PhD
entrance examination – 2023 April
Subject: Physics
1. The
Lagrangian equation of motion are _____ order differential equations
A) First B) Second C)
Third D) Fourth
2. The Richardson constant value with unit is
A) 1.2 × 106 Am-2
K B) 1.02 × 106 Am-2
K
C) 1.21 × 106 Am-2 K
D)
None of these
3. Quantum dot is a ______
entity
A) 3-dimensional B)
2-dimensional C)
1-dimensional D) 0-dimensional
4. Which one of the following is not a type of LCD
display?
A) Twisted Nematic
B) In-Plane Switching
C) Edge lit
D) Vertical alignment
5. In the inverse piezoelectric effect, ______ waves are
produced.
A) Electromagnetic B) Infrasonic C)
Ultrasonic D) Micro
6. A thermodynamic process in which pressure remains constant is called
A) Isobaric B) Isothermal C) Isotropic D) Isocyclic
4. Poisson bracket is useful to find the
(a) Integrals of motion
(b) Equations of motion
(c) Lagrange function
(d) Hamilton’s function
7. Poisson bracket is useful to find the
A) Integrals of motion B) Equations of motion
C) Lagrange function D) Hamilton’s function
8. APD is a
photodiode where A stands for
A) Advanced B) Aerial C)
Atomic D) Avalanche
9. The
reason for narrow tube in He-Ne laser
A) Atomic collision with
tube wall increases B) Atomic collision with tube wall decreases
C) There is no effect of narrow tube on He-Ne D)
None of these
10. Erbium doped fibers have long _________ leading to
coherent amplification.
A) Edges B) Metastable
states C) Connectors D)
None of these
11. Which of the following is described by the concept of numerical aperture in an optical fiber?
A) Light scattering B) Light collection C) Light deviation D) Light polarization
12. If uncertainty in the position of an electron is zero, the uncertainty in its momentum will be
A) <h/4𝜋 B)
>h/4𝜋 C)
zero D) infinite
13. The Andromeda galaxy is which of the following types of galaxies?
A) Elliptical B) Spiral C) Barred-spiral D) Irregular
14. Light signals are transmitted through optic fibers by
A) Multiple total internal refraction B) Birefringence
C) Dispersion D)
None of these
15. Which among the following is a dielectric?
A) Copper B) Aluminium C) Plastic D) Ceramic
16. Which of the following waves/rays are produced by nuclear changes in the atom?
A) Infrared rays B) Ultrasonic waves C) Gamma rays D) X-rays
17. The correct
sequence of the following materials in the increasing order of magnetic
susceptibility is
A) Diamagnetic – Ferromagnetic – Paramagnetic –
Superconductor
B) Ferromagnetic – Paramagnetic – Diamagnetic –
Superconductor
C) Paramagnetic – Diamagnetic – Superconductor –
Ferromagnetic
D) Superconductor –
Diamagnetic – Paramagnetic – Ferromagnetic
18. At high temperatures, a ferromagnet becomes
A) Diamagnet B) Soft Ferromagnet
C) Paramagnet D)
Hard Ferromagnet
19. If the momentum of an object increases by 20%, its kinetic energy will increase by,
A) 66% B) 77% C) 44% D) 55 %
20. Which of the
following will NOT show electron spin resonance (ESR)?
A) Free radicals B) Paramagnetic materials
C) Transition metals D) Diamagnetic materials
21. When electrons are trapped in the crystal lattice in place of anion vacancy, the defect in the crystal is known as
A) Non-stochiometric defect B) Stochiometric defect
C) F-centre D) Frenkel defect
22. Which of the following factors is the self inductance associated with a coil is independent of?
A) Induced voltage B) Current C) Time D) Coil resistance
23. A ferroelectric crystal loses spontaneous polarization at
A) Transition temperature B) Fermi temperature
C) Curie temperature D) Debye temperature
24. Two
tuning forks when sounded together produced 4 beats/sec. The frequency of one fork is 256. The number of
beats heard increases when the fork of frequency 256 is loaded with wax. The
frequency of the other fork is
A) 504 B) 520 C) 260 D) 252
25. Which one of the following set of gates are best suited for parity checking and parity generation?
A) AND, OR, NOT Gates B) NOR Gates
C) NAND Gates D) EX-NOR or EX-OR Gates
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