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
What type of current is induced in a closed loop of wire when it cuts across magnetic field lines?
A)
No current is induced
B)
Pulsating current
C)
Direct current
D)
Alternating current
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Direct current' (Option C).
Legal Metrology • Physics Paper-II
If a magnetic field is stationary and the magnetic flux through a loop of wire remains constant, what is the induced voltage?
A)
Zero
B)
Negative
C)
Maximum
D)
Random
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Negative' (Option B).
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
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
Q factor of a coil is measure of its
A)
retentivity
B)
mutual inductance
C)
self-inductance
D)
selectivity
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'retentivity' (Option A).
Legal Metrology • Physics Paper-II
Which of the following statements is true for 40Ar, 40K, and 40Ca?
A)
they have different mass number and same atomic number
B)
they have same mass number and same atomic number
C)
they have equal number of protons and electrons
D)
they have equal number of protons and neutrons taken together
40Ar, 40K, and 40Ca are isobars: all have mass number 40; thus their total protons+neutrons is the same.
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
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
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
‘Repeatable identity’ of a 3D crystal structure is
A)
Unit cell
B)
Lattice
C)
Crystal
D)
Bravais index
A unit cell is the smallest repeating geometric unit that reproduces the 3-D crystal lattice by translation.
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
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
Point out the true statement.
A)
Field of view of Huygens’ eyepiece is equal to that of Ramsden’s eyepiece.
B)
Field of view of Huygens’ eyepiece is unequal to that of Ramsden’s eyepiece.
C)
Field of view of Huygens’ eyepiece is greater than that of Ramsden’s eyepiece.
D)
Field of view of Huygens’ eyepiece is smaller than that of Ramsden’s eyepiece.
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'Field of view of Huygens’ eyepiece is unequal to that of Ramsden’s eyepiece.' (Option B).
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
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
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
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
In a parallel plate capacitor connected to an emf source as shown in the figure: Capacitor plates are moved apart with key ‘K’ being open, then
A)
Q remains same but V changes
B)
V remains same but Q changes
C)
Q remains same but C changes
D)
C remains same but Q changes
With the key open, the charge Q is conserved. Pulling plates apart decreases C, which increases V (since V = Q/C).
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 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
If the distance between the slit and screen is doubled in Young’s double slit experiment while the distance between the slits is reduced to half, then the fringe width will
A)
not change
B)
become half
C)
become doubled
D)
become four times
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'not change' (Option A).
Legal Metrology • Physics Paper-II
Einstein’s theory of specific heat is not followed by solid substances
A)
at very high temperature
B)
at very low temperature
C)
at latent heat of vaporization
D)
at latent heat of fusion
Einstein's theory fails to predict the T^3 dependence of specific heat at very low temperatures.
Legal Metrology • Physics Paper-II
In Newton’s ring experiment, the diameter of bright rings is proportional to
A)
odd natural numbers
B)
even natural numbers
C)
square root of odd natural numbers
D)
square root of even natural numbers
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'odd natural numbers' (Option A).
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.
