| Post Name | SCIENTIFIC OFFICER (DOCUMENTS) (KERALA POLICE SERVICE (FORENSIC)) |
|---|---|
| Question Paper Code | 171/2024 |
| Category Code | 635/2023 |
| Date of Test | 2 December 2024 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
As far as the simple pendulum is considered in a two-dimensional oscillator the
degree of freedom and number of constrains respectively are
Answer
B. 1, 1
2
By using d’Alembert’s Principle one can convert
Answer
A. dynamics problem into equivalent statics problem
3
The least action state in the context of the Hamilton-Jacobi equation means that
Answer
C. The action is minimized along the actual path taken by the system
4
In Wolff Rearrangement, the course of the reaction and the migratory preferences
can depend on the conditions (thermal, photochemical, metal ion catalysis) of
the reaction.
Answer
D. All statements are correct
5
The commonly used sequence of rotations in the ZyX convention for the
Euler Angle is
Answer
D. yaw, Pitch, Roll
6
A point at which a function f(z) ceases to be analytic is called
Answer
B. Singularity
7
Residue of f(z) = z³/[(z − 1)⁴(z − 2)(z − 3)] at z = 3 is
Answer
C. 27/16
8
The value of f(x) δ(x –
Answer
D. f(
9
The value of legendre polynomial Pn(1) is
Answer
B. 1
10
Each question is provided with four choices
Answer
D. having one correct answer.
Choose the correct answer and darken the bubble corresponding to the question number
using Blue or Black Ball Point Pen in the OmR Answer Sheet.
11
The factor/factors that limit the response speed of a photodiode is/are
Answer
D. All the above
12
Which of these factors doesn’t affect CMRR of an op-amp ?
Answer
D. None of the above
13
The output voltage of an open loop differential amplifier with input dc voltages at
inverting and non inverting terminals 6 microvolts and –8 microvolts respectively is
(Given amplifier gain is 100000 and input resistance is 2 megaohms)
Answer
A. 1.4 V
14
For an Am BSBFC modulator with a carrier frequency of 100 kHz and a maximum
modulating signal frequency of 5 kHz the bandwidth is
Answer
C. 10 kHz
15
For self-bias configuration of FET VGS is
Answer
D. Both A and C
16
Which among the following statements are correct in the case of Stark Effect and
Zeeman Effect ?
i. First order Stark Effect occur in degenerate states only.
ii. The d1 and d2 components of Sodium yellow doublet give 6 and 4 lines
respectively in Anomalous Zeeman Effect.
iii. The d1 and d2 components of Sodium yellow doublet give 4 and 6 lines
respectively in Anomalous Zeeman Effect.
iv. First order Stark Effect occur in non-degenerate states only.
Answer
C. i and iii are correct
17
Which among the following equations is Lorentz invariant ?
Answer
B. −[(h/2π)²c²∇² + m²c⁴]ψ = −(h/2π)² ∂²ψ/∂t²
18
Which among the following is correct ?
i. Weyl equation is lorentz invariant.
ii. Weyl equation is obeyed by elementary particles in Standard model.
iii. Weyl equation is not obeyed by elementary particles in Standard model.
iv. Weyl equation is obeyed by all spin 1/2 particles.
Answer
A. i and iii are correct
19
Which one among the following is the eigen values of l2 and lz are
2
h h h h
Answer
B. l ( l + 1) , m
2π 2π
2π 2π
2 2
h h h h
20
Regarding Pauli Spin matrices which of the following is correct ?
Answer
A. σ_x² = σ_y² = σ_z² = 1 and σ_+² = σ_−² = 0
21
Consider the case of mixing of two gases initially at two different temperatures
T1 and T2. The entropy of the resultant mixture will be
Answer
B. Greater than zero irrespective of identical or different gases
22
In an ideal Fermi gas, how does the Fermi energy ∈F depend on the particle
density n at absolute zero temperature ?
2 1 1
2
Answer
A. ∈F α n3
23
In a system of N ideal monatomic gas particles at thermal equilibrium, what is the total internal energy U of the gas as described by the equipartition theorem ?
Answer
C. U = (3/2)NkT
24
What happens to the internal energy of an ideal Fermi gas as the temperature
increases from absolute zero ?
Answer
D. The internal energy increases, reflecting the thermal excitation of particles into
higher energy states
25
At what temperature does a significant fraction of an ideal Bose gas begin to
occupy the ground state, leading to Bose-Einstein condensation ?
Answer
B. The temperature is below the critical temperature, which depends on the
particle density and particle mass of the gas
26
Which nucleus is expected to have the highest binding energy per nucleon based
on typical nuclear stability trends ?
Answer
C. 56Fe
27
Parity violation was first experimentally confirmed in the beta decay of
Answer
C. Cobalt-60
28
The Scherrer equation is used to estimate
Answer
A. The crystallite size from X-ray diffraction peaks
29
Which of the following properties of nuclear forces is explained by the exchange of
mesons according to Yukawa’s theory ?
Answer
B. The short-range nature of the nuclear force
30
In the context of the Eightfold Way in particle physics, which of the following
particle families are arranged in an octet ?
Answer
A. mesons and Baryons
31
The product of the pressure and volume of an electron gas at 0 K is
3 2E
Answer
B. 5 f( 0)
32
The Hall effect is an experiment used to measure
Answer
D. Sign of charge carriers
33
The atomic radius of potassium is 0.235 nm. What is its Fermi energy at absolute
zero ?
Answer
D. 2 eV
34
What is the maximum frequency of phonon when visible light with a wavelength of 5000 Å scatters from a crystal with a refractive index of 1.5 ? Given the velocity of sound in the crystal as 4000 m/s.
Answer
C. 1.5 × 10¹¹ rad/s
35
Given an X-ray beam with a wavelength of 1.54Å that is diffracted by a cubic KCl
crystal with a density 1.99 × 103 kg/m3, calculate the interplanar spacing for the
(200) planes. Given the molecular weight of KCl is 74.6 amu and the Avogadro’s
number is 6.023 × 1026 kg–1mol–1.
Answer
D. 3.14Å
36
The statements ‘inter nuclear distance remain constant during electronic
excitation’ and ‘the nuclei can be treated as stationary so that electrons move
relative to them’ are respectively.
Answer
A. Frank Condon Principle and Born-Oppenheimer approximation
37
Boron trichloride is a
Answer
B. Oblate symmetric top
38
The rotational Constant of 16O2 is 4 cm–1. The wave number of incident radiation in
a Raman spectrometer is 20450 cm–1. What is the wave number of first scattered
stokes line (in cm–1) of 16O2 ?
Answer
C. 20426 cm–1
39
The vibrational energy levels, ν"= 0 and ν' = 1 of a diatomic molecule are separated
by 2200 cm–1. Its anharmonicity (ωexe) is 10 cm–1. The values of ωe (in cm–1) and
first overtone (in cm–1) of this molecules are respectively.
Answer
Question Cancelled
40
Which of the following nuclei has a magnetic moment ?
Answer
A. 2d1
41
In the 8085 microprocessor during PUSH operation
Answer
A. The value of the Stack pointer decremented by two
42
To interface the ADC 0808/0809 with 8085 microprocessor which one of the following chip is essential ?
Answer
C. 8255
43
In 8051 microcontroller the internal architecture consists of
Answer
A. Two 16 bit Timers/Counters
44
Which of the following is the correct sequence of operations in a microprocessor ?
Answer
C. Opcode fetch, memory read, memory write, I/O read, I/O write
45
In an 8085 microprocessor DMA facility increase the data transfer speed between
Answer
D. Memory and I/O devices
46
The interaction of atoms in the excited state caused a decrease in the decay time
resulting in the collisional broadening of laser beams. What is the shape of such a
laser spectrum ?
Answer
C. lorentzian
47
Which of the following methods is used for producing extremely short pulses of
laser output on a repetitive basis in semiconductor lasers ?
Answer
C. Mode Locking
48
What is the external power efficiency of LASER with GaAs active region with a
band gap of 1.43 eV, when the total injection efficiency is 19% and a voltage of
3.2 volt is applied to the device.
Answer
A. 8.49%
49
Which of the following statements is not true ?
Answer
C. plastic fiber is normally used for long distance communications and has low loss
50
A 6 mW laser beam passes through a 32 km fiber of loss 0.2 dB/km. What is the
power at the output end ?
Answer
D. 1.37 mW
51
Where are the world’s largest deposits of bastnasite found ?
Answer
C. China
52
According to Pearson’s classification of acids and bases, which of the following is
considered a soft base ?
Answer
A. H–
53
The addition of SbF5 to HSO3F results in an increase in the concentration of
Answer
B. H2SO3F+
54
Which of these is not a metalloid ?
Answer
B. Tin
55
Which of the following is not an example of an arachno species ?
Answer
C. B₆H₁₀
56
Which among the following statement is wrong according to the mutual Exclusion
Principle ?
Answer
D. If there is no center of symmetry for a molecule, no vibrational modes can be
both infrared and Raman active
57
Which hybridization occurs in Fe(lI) orbitals in ferrocene, to accommodate the
electron pairs donated by C5H5– rings, according to the valence bond theory ?
Answer
C. d2sp3
58
Which is the chlorophyll molecular dimer at the reaction center associated with the
photosystem II (PSII) in plants, algae and cyanobacteria ?
Answer
B. P680
59
Which among the following species are isoelectronic with Na+ ?
i. O2– ii. F– iii. Ne iv. mg+
Answer
B. i, ii and iii
60
The oxidation numbers of the central metal ions in the complexes
Answer
A. g(NH3)2]CI,
61
For a radioactive disintegration series A → B → C →....., N₁, N₂, N₃, etc. designate the number of atoms of A, B, C, etc. λ₁, λ₂, λ₃, etc. are representing their corresponding decay constants and l₁ and l₂ are the average life periods of A and B. Then pick the right equation representing the radioactive equilibrium.
Answer
B. N₁/N₂ = λ₂/λ₁ = l₁/l₂
62
NaCI crystal contains
Answer
C. 9 planes of symmetry and 13 axes of symmetry
63
In a mixed metal oxide AB2O4 crystal, all A atoms and half of the B atoms have
been in the octahedral holes and half of the B atoms have been in the tetrahedral
holes. The structure of the metal oxide is
Answer
B. Inverse spinel
64
Which of the following statements are correct ?
i. A piezoelectric material generates a voltage when deformed.
ii. Piezoelectric effect is a reversible process.
iii. Piezoelectric effect is an irreversible process.
iv. Piezoelectricity means electricity results from pressure.
Answer
C. i, ii and iv
65
Pick up the characteristics of SOFC.
i. Oxidation of a fuel produces electricity.
ii. They operate at very low temperatures.
iii. Solid electrolyte conducts negative oxygen ions from the cathode to the anode.
iv. Solid electrolyte conducts negative oxygen ions from the anode to the cathode.
Answer
D. i and iii
66
Which of the following statement is correct ?
Answer
A. OH– is not a leaving group in E2 reactions
67
Which of the following statement is true about Mitsunobu reaction ?
Answer
D. All of the above
68
Which of the following compounds are aromatic ?
Answer
B. Cyclopentadienylanion and cyclohepta trienyl cation
69
Iminonitrile is initial product formed in
Answer
C. Thorpe reaction
70
Which of the following reactions are involved in Robinson annulation ?
Answer
C. michael addition and Aldol condensation
71
Select the correct statements from the following :
1. In Benzilic acid rearrangement, the aryl groups with electron withdrawing groups
migrate fastest than aryl group and alkyl group.
2. The Fries rearrangement reaction is ortho and para selective and one of the two
products can be favoured by changing reaction conditions, such as temperature
and solvent.
3. In Benzidine rearrangement, the rate determining step is the cleavage of the
N-N bond and formation of the
4. In Wolff Rearrangement, the course of the reaction and the migratory preferences
can depend on the conditions (thermal, photochemical, metal ion catalysis) of
the reaction.
Answer
D. All statements are correct
72
dIBAl-H
Answer
A. is a successful reagent for the reduction of an ester to an aldehyde which save
an extra step relative to liAIH4
73
Riley oxidations is
Answer
A. The oxidation of methylene groups using Selenium dioxide
74
Identify the name of the following reaction.
Br S N
Pd(dppf)Cl2 – dCm
N S N THF
N
ZnBr 100°C, mw, 20 min
Answer
A. Negishi Coupling
75
The catalytic oxidation of cyclohexene to adipic acid 1,6-hexanedioic acid is
carried out by
Answer
C. Starks Catalyst
76
The absorption at Lmax 279nm(e=15) in the UV spectrum of acetone is due to
Answer
B. n – π* transition
77
The order of carbonyl stretching frequency in the IR spectra of ketone, amide and
anhydride is
Answer
D. anhydride> ketone> amide
78
An organic compound with molecular formula C3H6Cl2 exhibits only one signal in
the Proton nmr spectrum. The compound is
Answer
A. 2,2-dichloropropane
79
What is DEPT technique ?
Answer
C. distortionless Enhancement by Polarisation Transfer
80
Natural product abietic acid is a
Answer
C. diterpene
81
Which of the following statements is incorrect ?
Answer
C. The entropy of a system increases with an increase in pressure when the
temperature is constant
82
Which of the following represents the ratio among the average, most probable and
root mean square velocities of a gas ?
Answer
D. 0.92 : 0.82 : 1:00
83
The entropy change associated with conversion of 1 mole of water to steam is ...
(latent heat of vaporization of water is 2.257 kJg–1)
Answer
A. 109 JK–1
84
At what pressure will the dissociation of 1 mole of PCl₅ to PCl₃ and Cl₂ be 20% at 225°C (Assume Kp = 0.5 atmosphere) ?
Answer
D. 12 atmosphere
85
From a crystal containing N atoms, if n cations and n anions are removed, the
different ways in which defects can be formed is given by the expression ?
N!
Answer
B.
(N − n) ! n!
2
N!
86
Match the following methods for surface area determination with their principles
Method Principle
1. BET Method P. Multilayer adsorption behavior
2. Langmuir Method Q. Monolayer adsorption model
3. Point B Method R. Intersection of adsorption
isotherms
4. Harkins-Jura S. Absolute adsorption technique
Answer
D. 1-P,2-Q,3-R,4-S
87
Which technique provides information on the oxidation states of surface atoms
through the study of core-level binding energies ?
Answer
C. X-ray Photoelectron Spectroscopy (XPS)
88
Match the following electrochemical concepts with their corresponding
descriptions.
Concept Description
1. Debye-Htckel theory a. Describes ionic activity in
electrolyte solutions
2. Onsager equation b. Describes the logarithmic
dependence of overpotential on
current density
3. Butler-Volmer equation c. Relates molar conductivity with ion
mobility
4. Tafel equation d. Expresses the current potential
relationship in electrode kinetics
Answer
B. 1-a,2-c,3-d,4-b
89
A solution contains 0.2 m NaCl and 0.05 m CaCl2. The ionic strength (I) of the
solution is
Answer
B. 0.35 m
90
The Hammett equation is expressed as
log (k/ko) = ρσ. The parameter ρ represent in this equation is
Answer
A. The sensitivity of the reaction to electronic effects
91
The number of radial nodes associated with 3s and 3p orbitals are respectively
Answer
D. 2 and 1
92
The number of microstates and ground state term symbols for the d8 configuration are
Answer
B. 45 and 3F4
93
The maximum populated J level (Jmax) for a rigid diatomic rotator can be
calculated as
kT 1 2kT 1
Answer
A. Jmax = −
94
The point groups of eclipsed ethane and staggered ferrocene are
Answer
C. d3h and d5d
95
Entropy (S) of a system is related to thermodynamic probability (W) through Boltzmann constant (k_B) as
Answer
A. S = k_B ln W
96
Which of the following synthetic method is a top-down approach for the synthesis
of nanomaterials ?
Answer
A. laser ablation
97
An example for magnetostrictive material is
Answer
B. Iron-Nickel alloy
98
How many significant figures are there in the numbers 0.0090500 and 0.00905
respectively ?
Answer
C. 5, 3
99
Craig’s method is an example for
Answer
D. Solvent extraction
100
C60 is an example for
Answer
A. 0d nanomaterial
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