GNDU 2020 Entrance Exam Question Paper M.Sc Physics

Set Id : 60872_7 GNDU - M Sc Physics

Section 1 - M Sc - Physics

1) The wave function for identical fermions is antisymmetric under particle interchange. Which of the following is a
consequence of this property?
A) Bohr correspondence principle

B) Bose-Einstein condensation

C) Pauli-exclusion principle

D) Heisenberg uncertainty principle

2) Bragg’s condition in reciprocal lattice is given as
A) 2k.G + k2 = 0

B) 2G.k + k2 = 0

C) 2k.G + G2 = 0

D) 2G.k + k2 = nπ

3) According to special theory of relativity which one is not an absolute quantity
A) Time

B) Both (A) and (B)

C) Mass

D) Height

4) Which of the following is called total heat function?
A) Enthalpy

B) Gibb’s function

C) Helmholtz function

D) Entropy

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Set Id : 60872_7 GNDU - M Sc Physics

5) When applied to solar radiation, Planck’s law reduces to Wein’s law in the
A) infrared region

B) ultraviolet region

C) microwave region

D) visible region

6) Maxwell-Boltzmann statistics cannot be applied to
A) Photons

B) Molecules

C) Atoms

D) None of above

7) If Vmp ,Vav and Vrms are the most probable speed, average speed and root mean square speed for an ideal gas obeying
Maxwell Boltzmann statistics, which of the following statement is true
A) Vav > Vmp < Vrms

B) Vrms > Vav > Vmp

C) Vmp > Vav > Vrms

D) Vmp < Vav > Vrms

8) How can one differentiate between a neutrino and antineutrino?
A) On the basis of charge

B) On the basis of mass

C) On the basis of helicity

D) On the basis of spin angular momentum

9) If density of CuCl which crystallizes as fcc structure is 3.4 g cm-3 .The unit cell dimension of CuCl is
A) 5.78 x 10-8 cm

B) None of above

C) 4.68 x 10-6cm

D) 0.79 x 10-11 cm

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Set Id : 60872_7 GNDU - M Sc Physics

10) Except for mass, the properties of the muon most closely resemble the properties of the
A) Photon

B) Electron

C) Pion

D) Proton

11) Which thermodynamics law is law of increasing entropy?
A) First Law o

B) Second law

C) Zeroth Law

D) Third Law

12) The work done on moving a charge of 2C in a circular path of radius 2m around a charge of 10C is
A) 5 J

B) 6.66 J

C) 10J

D) Zero

13) The inductance is a measure of
A) Magnetization of dipoles

B) Magnetic field stored by the material

C) EMF generated by energizing the coil

D) Electric charges stored by the material

14) A particle of charge ‘e’ and mass ‘m’ moves with a velocity ‘v’ in a magnetic field ‘B’ applied perpendicular to the
motion. The radius ‘r’ of its path in the field is
A) Be/mv

B) ev/mB

C) vB/me

D) mv/Be

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Set Id : 60872_7 GNDU - M Sc Physics

15) Half-life of neutron is
A) 10.2 mins

B) 1.05 year

C) 1.2 hours

D) 100.7 mins

16) The average energy of a harmonic oscillator in three-dimension is given as …..…,where k is the Boltzman constant
and T is a given temperature.
A) (3/2) kT

B) kT

C) (3/4) kT

D) 3kT

17) The particle decay Λ 0 = p + π- must be a weak interaction because
A) The Λ0 has spin zero

B) It does not conserve angular momentum

C) It does not conserve strangeness

D) No neutrino is produced

18) If EF is Fermi energy and kB is Boltzmann constant, Fermi function f(E) at a given temperature is given as the
reciprocal of the term
A) exp [(E-Ef)/kBT + 1]

B) exp [(E-Ef)/kBT] + 1

C) exp [(E-Ef)/kBT] - 1

D) exp [(E-Ef)/kBT - 1]

19) Gibbs potential is defined as
A) G=U+PV+TS

B) G=U-PV+TS

C) G=U+PV-TS

D) G=U-PV-TS

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Set Id : 60872_7 GNDU - M Sc Physics

20) On which factor kinetic energy of photoelectron depends
A) Distance between source of radiation and target

B) Intensity of incident radiation

C) Frequency of incident radiation

D) Cross section

21) Two photons A and B are travelling towards one another with a velocity c. The relative velocity of A w.r.t B is
A) 0.5 c

B) Zero

C) 2 c

D) c

22) Electromagnetic waves are reflected back by ionosphere due to their interaction with
A) all of these

B) neutrons

C) protons

D) electrons

23) The primary function of the bias circuit is to
A) ensure proper gain is achieved

B) hold the circuit stable at the designed Q-point

C) hold the circuit stable at Vin

D) hold the circuit stable at VCC

24) In Wein’s displacement law (λmT = b), the value of b is
A) 2.897mK

B) 2.897 x 10-3mK

C) 3.898 x 10-2mK

D) 3.898 x 102mk

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Set Id : 60872_7 GNDU - M Sc Physics

25) If the energy of a quantum harmonic oscillator is E_n=nhν, n=0,1,2…., the partition function of the system of oscillator
is

A)

B)

C)

D)

26) If the maximum energy of the recoil electrons be 1 MeV in Compton scattering of certain gamma-rays, what is the
energy of photon?
A) 0.52 MeV

B) 0.98 MeV

C) 2.234 MeV

D) 1.234 MeV

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Set Id : 60872_7 GNDU - M Sc Physics

27) Let ∆W be the work done in a quasi static reversible thermodynamic process. Which of the following statements
about ∆W is correct?
A) ∆W is always a perfect differential

B) ∆W is a perfect differential if the process is adiabatic

C) ∆W is a perfect differential if the process is isothermal

D) ∆W cannot be a perfect differential

28) The wavefunction where A and b are real constants, is a normalized eigenfunction
of the Schrodinger equation for a particle of mass M and energy E in a one-dimensional potential V(x) such that V(x)=0
at x=0. Which of the following

A)

B)

C)

D)

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Set Id : 60872_7 GNDU - M Sc Physics

29) An electric dipole is placed in a uniform electric field at an angle θ. For what value of θ, the potential energy of the
dipole is maximum
A) π/4

B) π

C) π/2

D) 0

30) If the electron in a hydrogen atom is in 3d state, what is the magnitude of orbital angular momentum (L)
A) √2 ћ

B) √6 ћ

C) ћ

D) None of these

31) Exchange particle for strong forces
A) Gluons

B) W±

C) pions

D) photons

32) The output voltage of an emitter follower is
A) 1800 out of phase with input voltage

B) much greater than input voltage

C) 900 out of phase with input voltage

D) in phase with input voltage

33) When a material particle of rest mass m attains speed c, its mass becomes
A) 2 m

B) Zero

C) 4 m

D) Infinite

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Set Id : 60872_7 GNDU - M Sc Physics

34) On inserting the sheet of bakelitewith in the plates of a parallel plate capacitor, the capacitance wiil
A) increase

B) becomes zero

C) remains same

D) decrease

35) At what velocity the kinetic energy of a particle is equal to its rest mass energy
A) c√(5/2)

B) c

C) c√3/2

D) c/2

36) In order to double the period of a simple pendulum, the length of the string should be
A) Doubled

B) Quadrupled

C) Halved

D) none of the mentioned

37) In a common base configuration of transistor circuit, collector current (Ic) is 0.96 mA and base current is 40 μA ,
what is the value of α
A) 1.02

B) 0.75

C) 1.36

D) 0.96

38) The relative permittivity of the free space is
A) 100

B) 1

C) 10

D) 0

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Set Id : 60872_7 GNDU - M Sc Physics

39) When two bodies stick together after collision, the collision is said to be
A) completely inelastic

B) partially elastic

C) none of these

D) perfectly elastic

40) If r is the radius of the atom in a crystal having simple cubic structure, then the nearest neighbour distance is
A) r/2

B) 3r/2

C) 4r

D) 2r

41) Phase space is a
A) 5 Dimensional Space

B) 3 Dimensional Space

C) 6 Dimensional Space

D) 4 Dimensional Space

42) The binding energy for a cooper pair is of the order
A) 102 eV

B) 106 eV

C) 10-3 eV

D) 10-8 eV

43) In a 3 dimensional crystal system how many Bravais lattices are associated with orthorhombic crystal system
A) 1

B) 2

C) 3

D) 4

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Set Id : 60872_7 GNDU - M Sc Physics

44) The Hamiltonian operator in the Schrodinger equation can be formed from the classical Hamiltonian by substituting
A) gaussian distributions of observables for exact values

B) sums over discrete eigenvalues for integrals over continuous variables

C) wavelength and frequency for momentum and energy

D) none of these

45) The energy associated with each degree of freedom of molecule is
A) kT/2

B) 2kT

C) kT

D) kT/4

46) What would be the rms speed for oxygen molecule at 300 K?
A) 612 m/s

B) 798 m/s

C) 821 m/s

D) 483 m/s

47) A blackbody at temperature T1 radiates energy at a power level of 10 (mW).The same blackbody, when at a
temperature of 2T1 radiates energy at a power level of
A) 80 mW

B) 40 mW

C) 10 mW

D) 160 mW

48) If (3 2 6) are the Miller indices of a plane, the intercepts made by the plane on three crystallographic axis are
A) (a, b, c)

B) (3a, 2b, 6c)

C) (a, 2b, 3c)

D) (2a, 3b, c)

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Set Id : 60872_7 GNDU - M Sc Physics

49) The average kinetic energy of an electron is related to Fermi energy at absolute zero ( EFo) as
A) Eo=5/7EFo

B) Eo=5/2EFo

C) Eo=7/3EFo

D) Eo=3/5EFo

50) The magnetostatics highly relies on which property
A) None of these

B) Resistance

C) Capacitance

D) Inductance

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Set Id : 60872_7 GNDU - M Sc Physics

Answer Keys
Question Paper No: 60872_7

1 C 26 D
2 C 27 B
3 B 28 C
4 A 29 B
5 B 30 B
6 A 31 C
7 B 32 A
8 C 33 D
9 A 34 A
10 B 35 C
11 B 36 B
12 D 37 D
13 C 38 B
14 D 39 A
15 A 40 D
16 D 41 C
17 C 42 C
18 B 43 D
19 C 44 D
20 C 45 A
21 D 46 B
22 D 47 D
23 B 48 D
24 B 49 D
25 D 50 D

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