Legal Metrology • Physics Paper-III
One of the eigenvalue of the matrix [[1, 2], [2, 1]] is
A)
3
B)
2
C)
5
D)
-1
For [[1,2],[2,1]], eigenvalues are 3 and −1; 3 is one valid eigenvalue.
Legal Metrology • Physics Paper-III
According to Heisenberg energy-time uncertainty principle
A)
The width of energy spectrum of excited states does not depend on the lifetime of the excited states
B)
The width of energy spectrum of excited states with larger lifetime is larger
C)
The width of energy spectrum of excited states with larger lifetime is smaller
D)
The width of energy spectrum of excited states with smaller lifetime is smaller
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is 'The width of energy spectrum of excited states with larger lifetime is larger' (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
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
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
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
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
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
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
Solid having the maximum thermal conductivity is
A)
Silver
B)
Diamond
C)
Copper
D)
Aluminium
Diamond has an exceptionally high thermal conductivity due to its rigid covalent lattice.
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 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 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
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).
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
Choose the atom having the highest number of neutrons.
A)
238U
B)
235U
C)
234U
D)
232Th
238U has 238−92=146 neutrons, the most among the options.
Legal Metrology • Physics Paper-II
How many different types of lattices (3D) are possible?
A)
4
B)
8
C)
14
D)
20
There are 14 Bravais lattices in three dimensions.
Legal Metrology • Physics Paper-II
Miller indices of the line of intersection of (-1-11) and (110) are
A)
[110]
B)
[101]
C)
[011]
D)
[110]
The line of intersection is found by the cross product of the normal vectors of the two planes, resulting in [110].
Legal Metrology • Physics Paper-II
Which of the statement is true?
A)
during charging of the capacitor, conduction current is discontinuous while displacement current is continuous in the connection wires.
B)
during charging of the capacitor, conduction current is continuous while displacement current is discontinuous in the gap between the capacitor plates.
C)
displacement current and conduction current are never equal
D)
the current that flows through connection wires is called conduction current.
In the context of Electrical / Electronics Engineering, the most appropriate and technically accurate answer is 'the current that flows through connection wires is called conduction current.' (Option D).
Legal Metrology • Physics Paper-II
The maximum number of atomic orbitals associated with a principal quantum number 4 is
A)
4
B)
8
C)
16
D)
24
The number of atomic orbitals in shell n is n²; for n=4, there are 16.
Legal Metrology • Physics Paper-II
For a series resonant LCR circuit, resonant frequency is given by
A)
f = 1 / (2π sqrt(LC))
B)
f = 5 - VEC
C)
f = 1 / (2π LC)
D)
f = 2π sqrt(LC)
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'f = 5 - VEC' (Option B).
Legal Metrology • Physics Paper-II
X-ray diffraction is based on
A)
Newton’s law
B)
Boltzmann equation
C)
Bragg’s equation
D)
Laue’s equation
Crystal X-ray diffraction follows Bragg’s law, nλ=2d sinθ.
Legal Metrology • Physics Paper-II
According to Bohr’s atomic theory, the radii of the orbits are in the ratio
A)
1:2:3:4
B)
1:3:5:7
C)
1:4:9:16
D)
1:5:11:19
In the context of Unmapped / long tail, the most appropriate and technically accurate answer is '1:5:11:19' (Option D).
Legal Metrology • Physics Paper-II
The equation V x B = a is representing
A)
Ampere’s law
B)
Gauss’s law
C)
Ohm’s law
D)
Faraday’s law
Based on established principles in Electrical / Electronics Engineering, the correct and most clinically/technically appropriate choice is 'Ohm’s law' (Option C).
Legal Metrology • Physics Paper-II
Coordination number for closest packed crystal structure
A)
16
B)
12
C)
8
D)
4
Close-packed FCC/HCP structures have coordination number 12.
