Legal Metrology • Physics Paper-II
Which of the following statement is false?
A)
Atomic oscillators vibrate with the same frequency.
B)
Atomic oscillators vibrate with the different energy.
C)
Atomic oscillators vibrate with the same amplitude.
D)
Atomic oscillators vibrate with the different frequency.
Einstein's model assumed all atomic oscillators vibrate with the SAME frequency, so stating they have different frequencies is false.
Legal Metrology • Physics Paper-II
In Michelson interferometer, when the two mirrors are perpendicular to each other, then the shape of the fringes are
A)
elliptical
B)
circular
C)
straight line
D)
inclined
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'elliptical' (Option A).
Legal Metrology • Physics Paper-II
Due to velocity dispersion each parabolic trace in Thomson’s Parabola Method is
A)
of very high deflection
B)
of very low deflection
C)
of very high intensity
D)
of very low intensity
Velocity dispersion makes Thomson parabolic traces weak/low-intensity; this item’s source wording aligns with the standard limitation.
Legal Metrology • Physics Paper-II
At very low temperatures, the specific heat at constant volume varies as
A)
T^0
B)
T
C)
T^3
D)
1/T
At very low temperatures, Cv is proportional to T^3 (Debye's T^3 law).
Legal Metrology • Physics Paper-II
Atomic packing factor is the
A)
distance between two adjacent atoms
B)
volume fraction of atoms in cell
C)
projected area fraction of atoms on a plane
D)
distance between center and edge of the lattice
The Atomic Packing Factor (APF) represents the volume fraction of atoms within a unit cell.
Legal Metrology • Physics Paper-II
For a Gaussian surface S, the electric flux @ will be given as
A)
®=GAdE
B)
®=¢EdA
C)
O=0
D)
®=$EdA
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'O=0' (Option C).
Legal Metrology • Physics Paper-II
During population inversion in laser, process is dominant.
A)
Stimulated emission
B)
Spontaneous emission
C)
Induced absorption
D)
Stimulated absorption
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Induced absorption' (Option C).
Legal Metrology • Physics Paper-II
Wiedemann-Franz law gives the relation between
A)
electrical and thermal conductivities
B)
electrical and specific heat
C)
specific heat and thermal conductivities
D)
structure and temperature of the solid
The Wiedemann-Franz law links the thermal conductivity of a metal to its electrical conductivity.
Legal Metrology • Physics Paper-II
Copper has a ___ specific heat capacity as compared to glass.
A)
equal
B)
lower
C)
greater
D)
incomparable
Copper has a lower specific heat capacity (~0.385 J/g°C) compared to glass (~0.84 J/g°C).
Legal Metrology • Physics Paper-II
Dielectrics are simply
A)
conductors
B)
semiconductors
C)
insulators
D)
superconductors
Dielectrics are insulating materials that can be polarized in an electric field.
Legal Metrology • Physics Paper-II
Stability of a nucleus is measured using
A)
Linear force
B)
Nuclear energy
C)
Proton energy
D)
Binding energy
Nuclear stability correlates strongly with binding energy per nucleon.
Legal Metrology • Physics Paper-II
Specific heat of solid is proportional to
A)
T
B)
T^2
C)
T^3
D)
1/T
According to Debye's theory, specific heat of solids is proportional to T^3 at low temperatures.
Legal Metrology • Physics Paper-II
Energy released in fission reaction is due to
A)
mass defect
B)
alpha radiation
C)
beta radiation
D)
gamma radiation
Fission releases energy because the products have lower total mass than the original nucleus; the mass defect becomes E=mc².
Legal Metrology • Physics Paper-II
Gauss’s law when applied to magnetic field, the net magnetic flux over the volume is
A)
Positive
B)
Negative
C)
Zero
D)
Maximum
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Positive' (Option A).
Legal Metrology • Physics Paper-II
If a conductor carries any net charge, using Gauss’s law, the charge will
A)
reside at the center of the conductor
B)
reside on the surface of the conductor
C)
distribute equally throughout the conductor
D)
all leave the conductor
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'reside on the surface of the conductor' (Option B).
Legal Metrology • Physics Paper-II
___ reactance increases with increasing frequency.
A)
Capacitive
B)
Inductive
C)
Resistive
D)
Complex
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'Resistive' (Option C).
Legal Metrology • Physics Paper-II
The range of Azimuthal quantum number is
A)
0 to n
B)
0 to s
C)
0 to n-1
D)
0 to s-1
The azimuthal/orbital quantum number l runs from 0 to n−1.
Legal Metrology • Physics Paper-II
___ proved the transverse phenomenon of light wave.
A)
Reflection
B)
Interference
C)
Diffraction
D)
Polarization
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Polarization' (Option D).
Legal Metrology • Physics Paper-II
The quantum numbers that defines the shell of the electron is
A)
n
B)
l
C)
m
D)
s
The principal quantum number n specifies the electron shell.
Legal Metrology • Physics Paper-II
The e/m value of positive rays in comparison to electrons is
A)
greater
B)
smaller
C)
equal
D)
not comparable
Positive rays are heavy ions, so q/m is far smaller than for electrons.
Legal Metrology • Physics Paper-II
Nuclei suitable for nuclear fusion is
A)
heavier nuclei
B)
lighter nuclei
C)
any nuclei
D)
halogens
Light nuclei are suitable for fusion because fusion of them releases binding energy per nucleon.
Legal Metrology • Physics Paper-II
The radius of Bohr’s orbit is proportional to ___ quantum number.
A)
directly; principal
B)
directly; square of principal
C)
inversely; principal
D)
inversely; square of principal
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'directly; square of principal' (Option B).
Legal Metrology • Physics Paper-II
In Young’s double slit experiment, the fringe width @ is given by
A)
λD/d
B)
2λD/d
C)
λd/D
D)
λD/2d
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is '2λD/d' (Option B).
Legal Metrology • Physics Paper-II
The compound, NaCl is an example of
A)
Molecular solid
B)
Covalent solid
C)
Ionic solid
D)
Metallic solid
NaCl (Sodium Chloride) is composed of positive and negative ions, making it an ionic solid.
Legal Metrology • Physics Paper-II
In Fresnel biprism, the two positions of lens give separation between the slits as 9 cm and 4 cm respectively. What is the actual distance of separation?
A)
4cm
B)
4.5cm
C)
5.5cm
D)
6cm
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is '4.5cm' (Option B).
