| Post Name | TRADESMAN - POLYMER TECHNOLOGY - TECHNICAL EDUCATION |
|---|---|
| Question Paper Code | 118/2025 |
| Category Code | 514/2024 |
| Date of Test | 22 September 2025 |
| Medium of Question | ENGLISH |
| Exam Type | OMR Examination |
| Total Questions | 100 |
1
Neoprene is chemically known as :
Answer
C. Poly chloroprene
2
The trade name for polyester fibre is :
Answer
B. Terlene
3
Buna-S is :
Answer
A. Rubber
4
Bakelite is produced by the condensation polymerization of _____________ and
_____________.
Answer
C. phenol and formaldehyde
5
Which of the following polymer has transparency?
Answer
A. Poly methyl methacrylate
6
Which of the following is a copolymer?
Answer
B. SBR
7
What is the apparatus that is utilized to add measured volumes of solution during
titration?
Answer
B. Burette
8
What is required on an analytical balance to measure mass less than 10 mg with
precision?
Answer
C. rider
9
Which apparatus is utilized to burn the rubber in the ash content experiment?
Answer
D. Silica crucible
10
Which type of centrifuge is used for determining the sludge content of latex?
Answer
C. Centrifuge with 2300 rpm
11
What is the size of the sieve used for determining coagulum content?
Answer
A. 180 microns
12
What is the friction ratio of a lab size mixing mill?
Answer
B. 1 : 1.25
13
What is the function of Vernier disc in a mixing mill?
Answer
A. for the required uniform nip adjustment of rolls
14
What is the principle behind a hydraulic press?
Answer
D. Pascal’s law
15
Which equipment provides data on the mass flow rate of plastic material per
10 minutes?
Answer
C. Melt flow index tester
16
The ratio of the energy of the intender after impact to its energy before impact. This
principle is belonging to which experiment?
Answer
B. Rebound resilience
17
What is the rotational frequency of the cylindrical drum of Din Abrader?
Answer
A. 40 +/−1 rpm
18
Modulus of rubber sample is determined by using :
Answer
A. Universal testing machine
19
What is the optimum pH content required to get better DRC in creaming of NR latex?
Answer
D. 10.8 to 11.8
20
What is the ammonia content usually preferred in low ammonia pentachlorophenate
(LA-SPP) system?
Answer
B. 0.2%
21
Which is not the content of LABZ system?
Answer
B. TMTD
22
Which is the anticoagulant usually using in CV rubber?
Answer
D. Hydroxylamine and ammonia
23
Which anticoagulant is not preferred to prevent pre-coagulation of latex using for
manufacturing of crepe rubber due to discolouration?
Answer
D. Formalin
24
Why removal of magnesium in NR latex is essential?
Answer
C. It stimulates bacterial proliferation
25
Standard Revertex latex is the latex concentrated by ______________ method
Answer
B. Evaporation
26
Which ISNR grade is using to manufacture pharmaceutical products?
Answer
A. ISNR 3L
27
Which of the following acts as enzyme poison thereby inhibiting VFA formation in low
ammonia preservative systems?
Answer
C. ZnO
28
The creaming agent used in natural rubber latex is/are :
Answer
D. All of these
29
How can we predict protein content from nitrogen content?
Answer
B. 6.25 × Nitrogen content
30
Which Indian standard is used to find out the volatile matter of natural rubber?
Answer
A. 3660 (part 1) 1972
31
Nitrogen content in raw NR is estimated by converting it into _____________ using
catalytic digestion.
Answer
B. Ammonia
32
The maximum possible amount of Ash content in ISNR 10 is :
Answer
C. 0.75%
33
The rate travel of power actuated grip shall be _____________ in rubber tensile strength
testing according to IS 3400.
Answer
D. 500 mm/min
34
The decrease in thickness of a rubber which has been deformed under specific conditions
of load, time and temperature is determined using :
Answer
D. ASTM D 395
118/2025 6 A
35
What is the test temperature adopting in tear strength testing of rubber vulcanizate
according to IS 3400?
Answer
C. 27 ± 2°C
36
The hardness scale used for flexible rubber is :
Answer
D. Shore A
37
Which ASTM standard is used for conducting an abrasion test of rubber samples using a
DIN abrader?
Answer
C. ASTM D 5963
38
What is the peptizer using in the determination of dirt content of natural rubber?
Answer
C. Copper oleate
39
Which of the following is the density range of High Density Polyethylene (HDPE)?
Answer
D. 0.941 to 0.965 g/cm3
40
The high melting point of Polypropylene (PP) is approximately :
Answer
A. 165°C
41
Which property makes UPVC (Unplasticized Polyvinyl Chloride) suitable for outdoor
applications?
Answer
C. Good weathering resistance
42
In flotation test, a sample floats in water. This indicates :
Answer
B. PP (Polypropylene)
43
Which material is often called “Bakelite”?
Answer
A. Phenol formaldehyde
44
In sodium fusion extract test, a white precipitate soluble in ammonia indicates the
presence of :
Answer
D. Chlorine
45
The rigidity of polystyrene is mainly due to the presence of :
Answer
B. Phenylene ring
46
Which additive is used to improve flexibility and plasticity of PVC?
Answer
C. Plasticizer
47
Which is a common thixotropic agent in FRP?
Answer
B. Fumed silica
48
The term “green strength” in rubber refers to :
Answer
A. Strength of uncured rubber
49
Plasticizers are classified under which main ingredient group?
Answer
D. Softners
50
Which coupling agent improves resin-fiber bonding in FRP?
Answer
B. Silane
51
In Chloroprene Rubber
Answer
C. R) vulcanization, combination of which metallic oxides are
used?
52
Which reinforcement material is most commonly used in boat hulls?
Answer
B. Glass fiber
53
Which residual monomer is associated with liver angiosarcoma in humans?
Answer
D. Vinyl chloride
54
The process of converting uncured rubber into an elastic state is called :
Answer
C. Vulcanization
55
Which resin is a mild to moderate skin irritant but becomes non toxic after curing?
Answer
A. Epoxy resin
56
Which resin is used for decorative laminates and table wares due to its excellent
resistance to hot water?
Answer
B. Melamine Formaldehyde
57
Phenol vapours may cause :
Answer
D. Respiratory irritation
58
The primary vulcanizing agent used in most rubber compound is :
Answer
B. Sulphur
59
The monomers of butyl rubber are:
Answer
B. Isobutylene and Isoprene
60
Which of the following statements are correct for butyl rubber?
(i) Very low gum tensile strength
(ii) Low resilience
(iii) Very low gas permeability
(iv) Excellent Ozone resistance
Answer
C. (ii), (iii) and (iv)
61
Which Plasticiser is most suitable with NBR?
Answer
A. Ester type
62
Fuel hose is made of:
Answer
B. NBR
63
Which of the following rubber have highest resilience?
Answer
B. PBD
64
Which curing system results in excellent aging properties in butyl rubber Vulcanisates?
Answer
D. Resin curing
65
The blend that combine the oil resistance, chemical resistance and flame resistance is :
Answer
C. NBR/PVC
66
As the ACN content of NBR increases:
(i) Elasticity increases
(ii) Abrasion resistance increases
(iii) Compatibility with plasticiser improves
(iv) Low temperature flexibility improves
Answer
B. Both (ii) and (iii)
67
Heater bands used for heating the barrel of injection moulding machine is of :
(1) Tubular heater
(2) Catridge heater
(3) Band heater
(4) Natural gas heater
Answer
D. All of these
68
Low compression ratio screw is used for :
Answer
B. PMMA
69
Which of the following extruder is best for producing products with reduced porosity?
Answer
C. Vented extruder
70
Tangential rotors are the peculiarities of :
Answer
A. Banbury mixer
71
Friction ratio of industrial two roll mixing mill is usually :
Answer
C. 1:1 to 1:1.4
72
Working principle of hydraulic press is based on :
Answer
C. Pascals law
73
What are the advantages of cold feed extruder?
(1) Lower capital cost of equipment
(2) Reduced labour cost
(3) Better temperature control
(4) Better dimensional control of the extruder
Answer
D. All of these
74
The primary method for manufacturing jugs with integral handles is :
Answer
B. Extrusion blow moulding
75
What is the function of styrene in unsaturated polyester based FRP formulation?
Answer
A. Diluent and crosslinking agent
76
The reduction in size of particle agglomerate during mixing is achieved by :
Answer
C. Dispersive mixing
77
Which of the following statements are correct for the location of the gate in injection
mould?
(i) Location and size of the gate should be in a location where part functionality is not
compromised
(ii) Gating is recommended at the thickest section of the part
(iii) The gate should not be located where the material can flow into a wall.
(iv) Gate should be located so that flow occur around core pins and holes
Answer
A. (i) and (ii)
78
The method of producing plastic film and sheet by squeezing the plastic through the gap
between two counter rotating cylinder is :
Answer
B. Calendering
79
The percentage by weight of the whole which is non-volatile in NR latex at a definite
temperature in an open atmosphere is called :
Answer
B. TSC
80
Device in chemical laboratory to protect from hazardous fumes, vapours and dust
generated during experiments is :
Answer
A. Fume cupboard
81
High VFA in NR latex tend to :
Answer
B. Destabilise the latex
82
Sludge content of latex can be determine using :
Answer
C. Centrifuge
83
Sieve residue is also called :
Answer
D. Coagulum content
118/2025 12 A
84
Induction period of creaming of latex is prolonged when :
Answer
B. More amount of creaming agent than optimum quantity is used
85
For getting a good dispersion the critical speed of rotation of jars is given by :
Answer
C. S = 54.2/R
86
Mixture of two liquids where one liquid is dispersed as droplets within the other is
called:
Answer
C. Emulsion
87
Density of serum of NR latex is :
Answer
A. 1.02 g/cm3
88
The free alkali content of High ammonia latex is :
Answer
B. 0.6% minimum
89
0.01N Oxalic acid solution is prepared in a 100 ml standard flask. The weight of Oxalic
acid used to make the solution is :
Answer
D. 6.3 g
90
An accurate device used in titration having a capacity of 50 ml and graduated to 0.1 ml.
Answer
D. Burette
91
Indicator used for titration between strong acid and strong base is :
Answer
B. Methyl Orange
92
Identify the poisonous chemical :
Answer
C. AgNO3
93
Dicumyl Peroxide is used in Laboratories as :
Answer
B. Vulcanising agent
94
In Kjeldhal method trapping solution for ammonia is :
Answer
D. Boric acid
95
Concentrated acids are always added to water for diluting in order to take care of :
Answer
D. All of the above
96
The indicator used in the titration of Oxalic acid with NaOH solution is :
Answer
A. Phenolphthalein
97
An indicator that is red in acidic solution and yellow in Basic solution is :
Answer
D. Methyl Orange
98
0.005 M EDTA disodium salt Dihydrate solution is prepared by dissolving :
Answer
C. 1.86 g in 1 litre water
99
Identify the type of chemical which must be stored under water :
Answer
B. Explosive chemicals
100
The display symbol Skull and Cross bone on lab reagent containers indicate :
Answer
B. Acute toxicity
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