| Post Name | JUNIOR SCIENTIFIC ASSISTANT β KERALA STATE POLLUTION CONTROL BOARD |
|---|---|
| Question Paper Code | 022/2023 |
| Category Code | 516/2021 |
| Date of Test | 1 April 2023 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
According to quantum mechanics, it is impossible to precisely and simultaneously specify
both the linear momentum and position of a particle. This principle is known as :
Answer
C. Heisenbergβs uncertainty principle
2
The SchrΓΆdinger equation consists of an energy operator known as :
Answer
B. Hamiltonian
3
The energy required to remove the outermost or valence electron from the isolated gaseous
atom is called the first ionization energy. Which of the following elements has the lowest
ionization energy?
Answer
A. Li
4
Which of the following is in correct order of electro negativity values in Paulingβs scale?
Answer
C. F > Cl > Br > I
5
In quantitative chemical analysis, the term precision refers to :
Answer
D. Reproducible result
6
Which of the following radiation is employed to study vibrational spectrum of a molecule?
Answer
A. Infrared radiation
7
In order to record the proton NMR spectrum, which of the following compound is used as
reference :
Answer
A. Tetramethylsilane
8
Paper chromatography is an example of :
Answer
D. Partition chromatography
9
The analytical technique that involves observing the change in weight of the substance as a
function of temperature is called :
Answer
C. Thermogravimetry
10
For the coagulation of negatively charged As2S3 sol , which of the following species will be
more effective?
Answer
C. Al 3 +
11
Gold number of A, B, C, and D are 0.13, 0.013, 0.003 and 0.31. The order of protective power
of these is :
Answer
B. C>B>A>D
12
Considering various theories of adsorption of gases on solids, which of the following is
incorrect :
Answer
D. Langmuir isotherm is of empirical nature
13
The gas that is known to damage the ozone layer in stratosphere is :
Answer
C. CF2 Cl 2
14
The disease itai-itai is caused by pollution due to :
Answer
B. Cd
15
Eutrophication causes :
Answer
B. Water pollution
16
Among the following, the main pollutant of leather tanneries is :
Answer
D. Chromium
17
Which one of the following is a greenhouse gas?
Answer
D. O3
18
The common scientific acoustic unit of sound measurement to study noise pollution is :
Answer
B. Decibel
19
Which of the following species attacks haemoglobin to form carboxyhaemoglobin thereby
causing poisoning effect?
Answer
C. CO
20
The polycyclic aromatic hydrocarbon, benzo (Ξ± ) pyrene is known for its :
Answer
B. Carcinogenic activity
21
The organic load of the water body can be expressed in terms of BOD, which refers to :
Answer
A. The degree of microbially mediated oxygen consumption in water
22
The commonly called black lung disease is also known as :
Answer
D. Pneumoconiosis
A 5 022/2023
23
Which one of the following is not matching with the principles of green chemistry?
Answer
C. The use of auxiliary substances like solvents, separating agents is highly
recommended
24
Which one of the following statements on water is wrong?
Answer
B. Heavy metal containing chemicals cannot be dissolved in water
25
Microwave assisted organic reactions have the advantage of :
Answer
A. Faster reaction rates
26
The dye which is commonly used as a fixative in an electron microscope :
Answer
B. Osmium tetroxide
27
Which type of chromatographic technique is employed for the purification of large
biomolecules of nucleic acids and proteins?
Answer
A. FPLC
28
RNA can be analyzed by which of the following blotting technique?
Answer
A. Northern blotting
29
Which staining method is used to identify DNA in specimens?
Answer
B. Feulgen staining
30
The annealing temperature in a PCR reaction usually ranges from :
Answer
C. 55-60Β°C
31
Identify the correct statement among the following :
(i) Addition of Lactobacillus cremoris in Swiss cheese results in eye formation and flavor
enhancement
(ii) Kimchi is a fermented fish product
(iii) Idli batter fermentation is favoured by Leuconostoc mesenteroides and streptococcus
faecalis
(iv) Shrikhand is a fermented milk product produced by Rhizopus oryzae
Answer
A. (iii)
32
The intestinal bacteria in infants commonly used as probiotic :
Answer
C. Bifidobacteria
33
Which among the statement is correct?
Answer
B. Critical control point aims at preventing physical chemical and biological hazards
in food
34
Bacillus coagulans causes ββββββββββ type of spoilage in canned foods.
Answer
D. Flat sour spoilage
35
βSweatingβ is a type of food preservation in which?
Answer
Question Cancelled
36
Which among the following is an example for enveloped virus?
Answer
A. Herpes virus
37
Which among the following is a method for cultivation of anaerobic bacteria?
Answer
B. Roll tube method
38
Which genera of archaea lacks cell wall and resembles like mycoplasma?
Answer
D. Both
39
An example for endospore forming bacteria :
Answer
D. All the above
40
Which among the following is an example for chemolithotrophic microbe?
Answer
A. Nitrosomonas
41
Which among the following is an example for sulphur reducing bacteria?
Answer
C. (A) and (D)
42
The production of antibiotics by one microorganism that inhibit or kill a susceptible microbe
is an example for which types of microbial interaction:
Answer
A. Amensalism
43
Which algae causes Florida red tide bloom?
Answer
B. Karenia brevis
44
Biological removal of dissolved organic matter is done in which stage of waste water
treatment?
Answer
B. Secondary
45
βββββββββββ is an airborne pathogen uniquely adapted to internal environment.
Answer
D. Legionella pneumophila
46
Which type of bioremediation technique is commonly used for removal of gaseous pollutants?
Answer
B. Biofilters
47
Which of the following indicates the steps in biogas production?
Answer
B. Hydrolysis β acidogenesis β acetogenesis β methanogenesis
48
Which species of earthworm is commonly employed in vermicomposting?
Answer
Question Cancelled
49
Which among the following is a hydrocarbon degrading bacteria?
Answer
D. All the above
50
Which among the following is a genetically engineered super bug utilized in petroleum
biodegradation?
Answer
A. Pseudomonas putida
51
A Non-protein amino acid :
Answer
A. Ornithine
52
Purity of isolated proteins is checked by :
Answer
B. Mass spectrometry
53
Nature of peritrichous flagella:
Answer
B. Flagella distributed all over body
54
A plant geneticist observed a white branch on an otherwise green plant and on crossing the
flowers produced on the white branch with pollen produced on the green branch all the
progeny was found to be white. On reciprocal crosses all progeny were found to be green.
Then, which among the statements are true :
Answer
A. The white branch was the result of a mutation in the chloroplast DNA
55
Which one is soil borne bacterial disease?
Answer
Question Cancelled
56
Immunity obtained through colostrum is :
Answer
A. Natural passive immunity
57
Which among is a neuromuscular autoimmune disease?
Answer
D. Myasthenia gravis
58
Which of the following radiation have longest wavelength?
Answer
D. Radio waves
59
A researcher isolated amylase from the pancreas of an experimental rat and 20 ΞΌ l of the
enzyme preparation showed an activity of 0.5 Units when allowed to react for 1 minute. The
concentration of the protein in the enzyme preparation was 0.25 mg/ml. Find out the specific
activity of the enzyme preparation?
Answer
D. 100 Units/mg
60
Atmospheric pressure is measured by :
Answer
D. Manometry
61
Carnegie 20 is :
Answer
D. Transposon vector of Drosophila
62
Kleonw fragment of DNA polymerase I lack :
Answer
C. 5β-3β exonuclease activity
63
Which among the following is an expression vector?
Answer
Question Cancelled
64
T4 DNA ligase is capable of :
Answer
C. Both stick and blunt end ligation
65
Two statements are given below. Analyse the statements and select the correct answer :
(a) Blue white colony selection using pUC recombinants work by alpha complementation
(b) Blue white colony selection requires a medium with X gal and IPTG
Answer
A. Both
66
First amino acid commercially produced by fermentation :
Answer
A. Glutamic acid
67
Which among is considered as GRAS status?
Answer
Question Cancelled
68
BOD used for the measurement of :
Answer
C. Sewage pollution
69
The gas that combines with water to form acid rain :
Answer
A. Sulphur dioxide
70
Microorganisms indigenous to a given ecosystem are called :
Answer
B. Autochthonous
71
The term ecosystem was proposed by :
Answer
B. A. Tansley
72
An animal viral vector :
Answer
C. SV40
73
An edible vaccine for foot and mouth disease :
Answer
Question Cancelled
74
In which format sequences submitted in Blast server?
Answer
A. FASTA
75
Which of the following is a protein data base?
Answer
D. PIR
76
Which of the following will exhibit Tyndall effect?
Answer
D. Milk
77
What is an Isotonic solution?
Answer
C. Solutions with same osmotic pressure
78
The semi-permeable membrane used for carrying reverse osmosis is made up of
ββββββββββ material.
Answer
B. Cellulose acetate
79
If 125mL of water is added to 250mL of 0.5M potassium sulphate solution, what will be the
molarity of the diluted solution :
Answer
D. 0.33M
80
Mole fraction is expressed as :
Answer
B. n/N
81
Name the primary substance used in the vulcanization of rubber :
Answer
A. Sulphur
82
When you perform Fehlingβs test, which among the following will give a positive result?
Answer
B. Glucose
83
ββββββββββ is the sugar molecule present in fruits.
Answer
C. Fructose
84
Which of the following will influence Protein folding?
Answer
D. All the above
85
ββββββββββ is the base not present in DNA.
Answer
B. Uracil
86
Which bacterial cell wall has a huge percentage of Teichoic acid?
Answer
A. Gram positive
87
Which of the following is not an indicator of water pollution?
Answer
B. Streptococcus pyogenes
88
Food preservation is carried out through cold sterilization, this involves :
Answer
A. Radiation
89
Pasteurization is the process of heating milk :
Answer
D. Below boiling point
90
Name the equipment used for the sterilization of the media after its preparation :
Answer
B. Autoclave
91
Which of the following is called the particulate pollutant?
Answer
B. Flyash
92
ββββββββββ contaminations lead to Mina Mata disease.
Answer
A. Mercury
93
Which of the following can significantly control global warming?
Answer
D. Reducing fossil fuel consumption
94
Which of the following is an exsitu conservation method for endangered species?
Answer
A. Cryopreservation
95
Which of the following happens naturally due to aging of lakes?
Answer
C. Eutrophication
96
ββββββββββ described cell in a dead cork tissue.
Answer
D. Robert Hook
97
Electron Microscope can provide magnification upto :
Answer
D. 400,000X
98
Which chromatography method involves a technique in which the stationary phase is held in
a narrow tube and the mobile phase is forced through it under pressure?
Answer
D. Column
99
Burning of wastes is not an acceptable practice of Solid waste management because :
Answer
D. It causes environmental issues
100
Enzymes used to cut DNA molecule in rDNA technology is :
Answer
D. Restriction enzymes
ββββββββ
022/2023 14 A
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