| Post Name | ASSISTANT SCIENTIST - KERALA STATE POLLUTION CONTROL BOARD |
|---|---|
| Question Paper Code | 096/2023 |
| Category Code | 582/2022 |
| Date of Test | 19 July 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
The best technique to determine the electrolytes in human plasma is
Answer
C. AAS
2
How much heat is required to vaporize one mole of a substance that has a measured
vapor pressure of 0.032 atm at 0°C and 0.178 atm at 52°C ?
Answer
A. 24.37 kJ/mol
3
XRF technique can be used for
Answer
Question Cancelled
4
micelle formation occurs when the substance is
Answer
C. Amphipathic
5
Among the following, green solvents include
i. deep eutectic solvent
ii. Ethyl lactate
iii. Ionic liquid
iv. CO2
v. Supercritical CO2
vi. FC-72
vii. THF
Answer
C. i, ii, iii, v, vi only
6
Which of the following is not connected to zeta potential ?
Answer
C. Energy dispersive X-ray
7
Average translational energy of colloidal particles is of the order
Answer
D. (3/2)kT per particle
8
lattice spacings of inorganic materials can be analyzed using
Answer
B. HR-TEm
9
Accumulation of nutrients in lakes and water bodies is called
Answer
B. Eutrophication
10
Each question is provided with four choices
Answer
C. and
11
Ozone layer can be found
Answer
A. 10-30 kms above earth surface
12
Acidity of rain is best described by presence of
Answer
Question Cancelled
13
To protect ozone layer and to retain properties of CFC, the latter is largely replaced by
Answer
B. Hydrofluorocarbon
14
The main species causing photochemical smog is
Answer
B. NO radical
15
most radioactive element is
Answer
D. Radium
16
Pyrethrin is a natural
Answer
Question Cancelled
17
Oxidation using potassium dichromate is for determining
Answer
B. COd
18
Which of the following corresponds to a linear operator ?
Answer
B. A
19
Consider an electron in a 1d box of length 12 A . What will be the energy difference
between E6 and E5 levels (in cm–1) for the electron ?
Answer
C. 2.3 ×104
20
Which statement is true for I = [CoF₆]³⁻ and II = [NiF₆]²⁻?
Answer
C. I is paramagnetic and II is diamagnetic
21
For a complex [mn(H2O)6]2+ average value of B is calculated to be 782 cm–1 from
the _________. The value of B for free mn2+ is 960 cm–1. The value of nephelauxetic
ratio is _________.
Answer
D. Tanabe-Sugano diagram, 0.814
22
Hydrous oxide precipitate of aluminium for gravimetric estimation is best made by
Answer
A. Addition of urea
23
An α,β-unsaturated ketone of relative molecular mass 110 has λ_max = 215 nm and ε = 10,000. A solution showed A = 2 in a 1 cm cell. Calculate its concentration in g/L.
Answer
D. 2.2 × 10⁻²
24
Consider a column chromatogram with 2 peaks of width 1.11 and 1.21. The retention
time (in minutes) for the first signal is 16.4 and for the second is 17.6. What is the
column resolution ?
Answer
Question Cancelled
25
The signal for methylene protons in the proton NmR of benzyl bromide is at δ 4.6 ppm.
Calculate the difference in frequency (in Hz) between this and TmS signal in a
300 mHz instrument.
Answer
B. 1380
26
A biopesticide
Answer
C. Poly d Glucosamine
27
In centrifugation
Answer
B. A dense particle moves more rapidly than a less dense one because the
opposing buoyant force is smaller for a dense particle
28
Cells capable of producing antibodies
Answer
B. B lymphocytes
29
Half life of radio isotope 32P
Answer
B. 14 days
30
monoprotic acid
Answer
D. lactic acid
31
Smallest virus
Answer
B. Adeno virus
32
Termination codon
Answer
A. UGA
33
Tissue plasminogen activator
Answer
A. Serine protease
34
metacyc is
Answer
Question Cancelled
35
Common organisms causing meat spoilage
Answer
A. Brochothrix spp. and Carnobacterium spp.
36
Hydrogen can be used as biofuel and can be produced directly using sugars and
fatty acids by
Answer
B. Clostridium
37
One gene one enzyme hypothesis is proposed by
Answer
B. Beadle and Tatum
38
In Bioreactors
i. Aeration system is one of the very important parts of a fermentor.
ii. Impeller can reduce proper aeration.
iii. Impeller blades helps to reduce the size of air bubbles.
iv. A foam-controlling device is mounted on top of the fermentor to control
contamination.
Answer
B. i and iii are correct
39
methods for removal of marker genes in transgenic plants
Answer
A. Co transformation and site specific recombination
40
Nutritional edible mushrooms
i. Volvariella volvacea and Agaricus bisporus
ii. Flammulina velutipes and Lentinula edodes
iii. Boletus edulis and Lentinula edodes
iv. Volvariella volvacea and Auricularia heimuer
Answer
D. i, ii, iii and iv
41
X-ray diffraction
Answer
D. All of these
42
Incomplete antigens
Answer
A. Haptens
43
Amino acid with OH side chain
Answer
A. Serine
44
mac Conkey’s Agar
Answer
D. All of these
45
Find true statements.
i. RFlP is based on polymorphism.
ii. PCR based molecular markers are cheap, but time consuming.
iii. RAPd is a PCR based method.
iv. PCR is not needed for dAF.
Answer
D. i and iii
46
In Industrial scale, ergosterol can be produced by
Answer
D. Saccharomyces cerevisiae
47
Transfer of CGTase to potato leading to production of
Answer
D. Alpha and Beta cyclodextrins
48
Biological degradation of organic matter of sludge occurs in different stages
Answer
D. Hydrolysis, Acidogenesis and methanogenesis
49
Cytochromes are
Answer
Question Cancelled
50
Volatile organic compounds can be removed by
Answer
D. All of these
51
Which fluorescent dye is used to stain bacterial nucleic acids in fluorescence
microscopy ?
Answer
D. Acridine Orange
52
In the table given below, Column I shows different microscopy techniques and
Column II shows major uses of the different microscopy techniques. Select the correct
combination.
Column I Column II
Observation of dead stained organisms or live ones
1 Bright Field a
with sufficient natural colour contrast
Observation of unstained living or difficult-to-
2 dark Field b
stain organisms; allows one to see motion
diagnostic tool for detection of organisms
3 Fluorescence c or antibodies in clinical specimens or for
immunologic studies
4 Confocal d Observation of very specific levels of specimen
Observation of exterior surfaces of atoms or
5 Transmission Electron e
molecules
Examination of thin sections of cells for details of
6 Scanning Tunneling f internal structure, exterior of cells, and viruses,
or surfaces when freeze-fracturing is used
Answer
B. 1 – a, 2 – b, 3 – c, 4 – d, 5 – f, 6 – e
53
Which step of the Gram staining process is responsible for the differentiation of
Gram-positive and Gram-negative bacteria ?
Answer
B. decolorization with ethanol or acetone
54
Which of the following statements about lyophilization are true ?
Answer
A. Rapidly frozen organisms in vials are subjected to a vacuum instrument that
removes water from them and seals the vials under vacuum
55
Which biotyping method focuses on the identification of specific surface antigens or
markers on microorganisms ?
Answer
B. Serotyping
56
Which of the following antibiotic inhibits folic acid synthesis by competitively inhibiting
the enzyme dihydropteroate synthase ?
Answer
D. Trimethoprim
57
different types of bacteria have different oxygen growth requirements. In the table
given below, Column I shows names of different bacterial groups and Column II
shows their descriptions. Select the correct combination.
Column I Column II
1 Obligate anaerobe a Killed by oxygen
2 Obligate aerobe b must have abundant oxygen
3 Capnophile c likes carbon dioxide
4 microaerophile d Grows with or without oxygen
5 Facultative anaerobe e Needs only a small amount of oxygen
Answer
C. 1 – a, 2 – b, 3 – c, 4 – e, 5 – d
58
Which of the following statements about the lysogenic cycle of bacteriophages is true ?
Answer
D. All of the above
59
Which of the following diagnostic media is used to identify Salmonella in clinical and
food samples ?
Answer
A. Brilliant Green Agar
60
Which process involves the movement of dNA segments from one location to another
within the genome, contributing to genetic variation in bacteria ?
Answer
C. Transposition
61
Which of the following statements about soil microorganisms is false ?
Answer
B. They never affect or change the physical characteristics of their soil microenvironment
62
Which of the following tests is used to detect the presence of specific pathogens
such as Salmonella and Shigella in water samples ?
Answer
D. Polymerase Chain Reaction (PCR)
63
Which among the following diseases is caused by a fungus that is primarily transmitted
through inhalation of fungal spores in the air ?
Answer
B. Histoplasmosis
64
Which among the following is a sulphate-reducing bacterium ?
Answer
D. All of the above
65
Which of the following is an example of amensalism in microbial interactions ?
Answer
C. Antibiotic production by bacteria inhibiting the growth of other bacteria
66
What is the major advantage of using a membrane bioreactor in wastewater treatment
compared to conventional activated sludge processes ?
Answer
A. Higher effluent quality
67
Which microbial process involves the enzymatic conversion of Polychlorinated
Biphenyls (PCBs) to more readily degradable forms ?
Answer
D. dechlorination
68
Chemolithotrophic acidophilic bacterium Thiobacillus ferrooxidans is used in biomining
due to its ability to oxidize
Answer
Question Cancelled
69
Which of the following is the advantage of employing microbial biosensors for
environmental monitoring ?
Answer
D. All of the above
70
Which of the following bioreactor designs offer improved oxygen supply for efficient
waste treatment ?
Answer
A. membrane bioreactor
71
milk serves as an excellent substrate for the growth of microorganisms. In the table
given below,Column I shows names of different microorganisms that grow on milk
and Column II shows their descriptions. Select the correct combination.
Column I Column II
1 Staphylococcus epidermidis a Present in freshly drawn milk
2 Acinetobacter johnsoni b Causes a viscous slime to form in milk
3 Escherichia coli c Causes a faecal flavour on milk
4 Pseudomonas species d Can grow on refrigerated milk
5 Streptococcus lactis e Causes milk to sour
Answer
A. 1 – a, 2 – b, 3 – c, 4 – d, 5 – e
72
Which of the following microorganisms is responsible for spoilage of canned food as they
can withstand the canning process and cause bulging of the cans and food spoilage ?
Answer
D. Bacillus stearothermophilus
73
Which of the following is not a hard cheese ?
Answer
A. Camembert
74
Which of the following is the active antimicrobial ingredient in bleaching powder ?
Answer
C. Hypochlorite
75
Which of the following is achieved through pasteurization of milk ?
Answer
D. It kills microbial pathogens that might be present in milk
76
Who proposed the pH scale ?
Answer
A. Soren Sorenson
77
Find out the wrong statement.
Answer
C. Protein folding occurs not stepwise generally.
78
Chernobyl disaster is classified as a _______ event on the international nuclear event
scale.
Answer
A. Level seven
79
Read the statements below :
i. Carbon dioxide, methane and other trace gases are known as green gases.
ii. Release of huge quantities of nitrogen and sulphur oxide into air combine with
moisture and causes the acid rain.
iii. The main component of photochemical smog is hydrogen.
Which of the above statement/s is/are correct ?
Answer
Question Cancelled
80
Identify the technique where m-RNA is separated by electrophoresis.
Answer
D. None of these
81
When RBC are placed in a hypotonic solution
Answer
D. The cell swell and eventually burst
82
The Hsp 60 chaperons sometimes called
Answer
B. Chaperonins
83
Find out the wrong statement from the following.
Answer
D. micro-organisms can be cultured only in solid medium.
84
___________ chemical substances that persist in the environment bio-accumulate
through the food web and pose a risk causing adverse effects to human health.
Answer
B. Persistant organic pollutants
85
The cofactor for the enzyme reaction in PCR is
Answer
C. magnesium and potassium
86
Read the following statements.
i. Solutions are homogenous mixture of two or more substances such as solids,
liquids or gases.
ii. According to Henry’s law, the solubility of a gas in a liquid is directly proportional
to the partial pressure of the gas over the solution.
Choose the correct option :
Answer
D. Both are correct
87
Find out the odd one.
Answer
B. dacron
88
Read the statements.
i. Before staining all the bacteria are colourless.
ii. Afterwards gram positive bacteria are stained red.
iii. Afterwards gram negative bacteria are stained violet.
iv. In gram staining of bacteria lugol’s iodine is used as mordent.
Choose the correct option :
Answer
C. Both ii and iii are incorrect
89
‘Silent Spring’ was written by
Answer
B. Rachel Carson
90
Coarse screens are
Answer
A. Used to remove floating materials like rags, paper, wood from sewage
91
Identify the Gibbs free-energy formula.
Answer
C. ΔG = ΔH − TΔS
92
Find out true statement from the following.
Answer
B. Inulin is a fructose polymer.
93
Identify the bacterium chiefly responsible for the leaching of metal sulphides.
Answer
C. Thiobacillus ferroxidans
94
Eutrophication in aquatic system is due to the release of
Answer
A. Nitrate and phosphate
95
Insitu bioremediation means
Answer
Question Cancelled
96
From the following identify the disease caused due to eating of infected canned or
smoked food.
Answer
C. Botulism
97
___________ has developed a system of classifying protected areas that ranges
from minimal to intensive use of the habitat by humans, with six categories.
Answer
C. IUCN
98
Which among the following statements is related to lipids are correct ?
Answer
A. lipids are soluble in acetone
99
Which is the first chlorinated organic insecticide came into wide commercial use,
during Second World War ?
Answer
D. ddT
100
Read the following statements.
i. Water functions as a base in reaction with acids.
ii. Water functions as an acid in reaction with acids.
iii. Water is a very weak electrolyte.
iv. Water is a strong electrolyte and therefore a good conductor.
Which of the above statement/s is/are correct ?
Answer
B. Both i and iii are correct
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