PROVISIONAL ANSWER KEY

Question 84/2023/OL
Paper Code:
Category 760/2021
Code:
Exam: Tradesman (Polymer Technology)
Date of Test 15-06-2023
Department Technical Education
Question1:-Who is known as the "Father of Modern Polymer Science"?
A:-Wallace Carothers
B:-Hermann Staudinger
C:-P.J. Flory
D:-Charles Goodyear
Correct Answer:- Option-B
Question2:-Monomers used in addition polymerization is
A:-Saturated compounds
B:-Unsaturated compounds
C:-Bifunctional saturated compounds
D:-Trifunctional saturated compounds
Correct Answer:- Option-B
Question3:-Polyester fibre are prepared by
A:-Melt spinning
B:-Dry spinning
C:-Wet spinning
D:-All the above
Correct Answer:- Option-A
Question4:-Functionality of Adipic acid is
A:-One
B:-Two
C:-Three
D:-Four
Correct Answer:- Option-B
Question5:-Which polymer is used in bullet-proof vests?
A:-Polycarbonate
B:-Polyurethane
C:-Polyethylene
 D:-Kevlar
Correct Answer:- Option-D
Question6:-Which of the following polymers can be synthesized by ring opening
polymerization?
A:-Nylon 6
B:-Poly (ethylene terephthalate)
C:-Polyurethane
D:-Polyethylene
Correct Answer:- Option-A
Question7:-Which protein plays a role in the latex coagulation mechanism by
bridging between rubber particles?
A:-Globulins
B:-Hevein
C:-Albumins
D:-Prolamins
Correct Answer:- Option-B
Question8:-Identify the component which has the maximum composition in the
Hevea rubber latex?
A:-Rubber hydrocarbon
B:-Sugar
C:-Phosholipids
D:-Water
Correct Answer:- Option-D
Question9:-In the production of PLC, yellow pigments can be destroyed by
A:-Spontaneous coagulation
B:-Putrefaction
C:-Fractional coagulation
D:-None of these
Correct Answer:- Option-C
Question10:-The concentration of Ammonia used for preserving field latex is
A:-0.7% by weight on latex
B:-0.2% by weight on latex
C:-0.025% by weight on latex
D:-1% by weight on latex
Correct Answer:- Option-D
Question11:-Which among the tapping system is adopted one or two years before
replanting or replacing crop?
 A:-Puncture tapping
B:-Slaughter tapping
C:-Controlled upward tapping
D:-Ladder tapping
Correct Answer:- Option-B
Question12:-Natural rubber latex can be coagulated using
A:-Ammonia
B:-Formic acid
C:-CBS
D:-Silica
Correct Answer:- Option-B
Question13:-Glass transition temperature of Natural Rubber is
A:-+100°C
B:-–100°C
C:-–70°C
D:-+70°C
Correct Answer:- Option-C
Question14:-Surgical gloves are manufactured by
A:-Dipping
B:-Extrusion
C:-Casting
D:-Gelling
Correct Answer:- Option-A
Question15:-Parthenium Argentatum is commonly known as
A:-Gauyule rubber
B:-Panama rubber
C:-Para rubber
D:-India rubber
Correct Answer:- Option-A
Question16:-Electro decantation is related with
A:-Foaming of latex
B:-Coagulation of latex
C:-Sludge removal from latex
D:-Concentration of latex
Correct Answer:- Option-D
Question17:-Linear low density polyethylene is a copolymer of ethylene and a small
fraction of _______.
A:-Butene
B:-Isoprene
C:-Butadiene
D:-Butane
Correct Answer:- Option-A
Question18:-In Lassaigne's test for the detection of halogens, the sodium fusion
extract is first boiled with concentrated nitric acid. This is performed to
A:-Remove silver halides
B:-Dissolve
C:-Decompose and
D:-Dissolve
Correct Answer:- Option-C
Question19:-Which of the following fibre is known as "Dacron"?
A:-Polyester
B:-Polyurethane
C:-Acrylic
D:-Nylon
Correct Answer:- Option-A
Question20:-Resole is an example for
A:-Thermoplastic elastomer
B:-Thermosetting polymer
C:-Thermoplastic polymer
D:-Synthetic Rubber
Correct Answer:- Option-B
Question21:-Which of the following is a thermoplastic polymer?
A:-PVC
B:-Bakelite
C:-Epoxy resin
D:-None of these
Correct Answer:- Option-A
Question22:-The catalyst used in the polymerization of propylene is
A:-
B:-
C:-
D:-
 Correct Answer:- Option-B
Question23:-The term "Tenacity" is associated with
A:-Rubber
B:-Solvent
C:-Polymerization
D:-Fibre
Correct Answer:- Option-D
Question24:-Which of the following grade of polystyrene is well suited for the
purpose of insulating applications?
A:-Expandable
B:-General Purpose
C:-HIPS
D:-All the above
Correct Answer:- Option-A
Question25:-An example for dienes used in the manufacture of EPDM is
A:-Ethylidene norbornene
B:-Dicyclopentadiene
C:-Vinyl norbornene
D:-All the above mentioned
Correct Answer:- Option-D
Question26:-Identify the monomers of butyl rubber.
A:-Isoprene and Isobutylene
B:-Isoprene and Propylene
C:-Isobutylene and methylene
D:-Isobutylene and ethylene
Correct Answer:- Option-A
Question27:-Which is an inorganic polymer?
A:-Nitrile rubber
B:-Polyurethane rubber
C:-Silicone rubber
D:-Chloroprene rubber
Correct Answer:- Option-C
Question28:-Chloroprene rubber is vulcanized using
A:-Metal oxide
B:-Epoxy
C:-Oxime
 D:-Peroxide
Correct Answer:- Option-A
Question29:-The synthetic rubber used in the inner tubes of tyre is
A:-SBR
B:-NR
C:-IIR
D:-Hypalon
Correct Answer:- Option-C
Question30:-Higher acrylonitrile content in NBR leads to
A:-Improved hardness
B:-Good tensile strength
C:-Good oil resistance
D:-All the above mentioned
Correct Answer:- Option-D
Question31:-An example for a homopolymer is
A:-Polybutadiene rubber
B:-Nitrile Rubber
C:-Styrene butadiene rubber
D:-Acrylonitrile butadiene styrene
Correct Answer:- Option-A
Question32:-Buna N is a copolymer of ______ and ______.
A:-Styrene and Butadiene
B:-Acrylonitrile and Butadiene
C:-Isoprene and Isobutylene
D:-Dicyclopentadiene and Isobutylene
Correct Answer:- Option-B
Question33:-Ribbed Smoked sheets are graded according to the standards as per
A:-IS 3708 : 1968
B:-IS 15361 : 2003
C:-IS 5599 : 1999
D:-IS 6450 : 1971
Correct Answer:- Option-B
Question34:-DIN Abrader is used to measure
A:-Tensile strength
B:-Resilience
C:-Abrasion resistance
 D:-Hardness
Correct Answer:- Option-C
Question35:-ASTM D412 standard defines procedures used to evaluate _______
properties of vulcanized thermoset rubber and thermoplastic elastomers.
A:-Hardness
B:-Tensile
C:-Compression set
D:-Resilience
Correct Answer:- Option-B
Question36:-______ indicates the resistance of raw rubber to deterioration during
processing or aging.
A:-FEF
B:-PRI
C:-DPNR
D:-Po
Correct Answer:- Option-B
Question37:-Hardness is measured using
A:-Durometer
B:-UTM
C:-Screw gauge
D:-Abrader
Correct Answer:- Option-A
Question38:-In tensile testing, the standard rate of grip separation in rubbers is
A:-120 ± 50 mm/min
B:-75 ± 50 mm/min
C:-500 ± 50 mm/min
D:-50 ± 50 mm/min
Correct Answer:- Option-C
Question39:-The percentage of dirt in ISNR 5 is
A:-0.05%
B:-5%
C:-0.5%
D:-0.005%
Correct Answer:- Option-A
Question40:-Which among the following parameter is considered for grading ISNR?
A:-Dirt Content
 B:-KOH number
C:-Viscosity
D:-Cure rate
Correct Answer:- Option-A
Question41:-As per ASTM D395 for the determination of compression set under
constant force in air, a force of _______ is applied to the specimen for a set time at a
set temperature.
A:-1.8 kN
B:-1 kN
C:-2 kN
D:-3 kN
Correct Answer:- Option-A
Question42:-ISNR grade which doesn't show storage hardness
A:-ISNR-50
B:-ISNR-20
C:-ISNR-5
D:-ISNR-3 CV
Correct Answer:- Option-D
Question43:-Higher VFA number in a natural rubber latex indicates
A:-Loss of colloidal stability
B:-High level of Ammonia
C:-Low level of Ammonia
D:-Improved colloidal stability
Correct Answer:- Option-A
Question44:-Viscosity of latex is measured using
A:-ODR
B:-Brookfield Viscometer
C:-Mooney Viscometer
D:-All the above
Correct Answer:- Option-B
Question45:-Magnesium content of latex is estimated by direct titration with ______
using Erichrome
Black T as indicator.
A:-0.02 N Solution
B:-0.1 N
C:-0.005 M EDTA Solution
D:-0.05 N Solution
 Correct Answer:- Option-C
Question46:-As per IS 5430 - 1981, the maximum permissible value for Coagulum
content for preserved natural rubber latices is
A:-1% by mass of latex
B:-0.15% by mass of latex
C:-0.10% by mass of latex
D:-0.05% by mass of latex
Correct Answer:- Option-D
Question47:-Water soluble ingredients can be added into latex as _______.
A:-Dispersions
B:-Solutions
C:-Emulsions
D:-Foaming agent
Correct Answer:- Option-B
Question48:-Dispersions can be prepared using
A:-Ball mills
B:-Vibration mills
C:-Colloid mills
D:-All the above mentioned
Correct Answer:- Option-D
Question49:-TMTD is added into the latex as ________.
A:-Emulsion
B:-Dispersion
C:-Solution
D:-None of the above mentioned
Correct Answer:- Option-B
Question50:-Identify the creaming agent used for concentrating latex
A:-Tamarind seed powder
B:-Vulcafor F
C:-Stearic acid
D:-Sodium Silicofluoride
Correct Answer:- Option-A
Question51:-KOH is added to the latex compound as
A:-Emulsions
B:-Dispersion
C:-Suspension
 D:-None of the above mentioned
Correct Answer:- Option-D
Question52:-Dry rubber content of field latex can be measured roughly using
A:-Metrolac meter
B:-Lactometer
C:-Saccharometer
D:-Acidometer
Correct Answer:- Option-A
Question53:-Which is used for the proper alignment of the nozzle and mold of the
injection molding machine?
A:-Spider
B:-Sprue
C:-Register ring
D:-Sprue bush
Correct Answer:- Option-C
Question54:-Which type of cooling system provides the most efficient heat
exchange in the calendaring process?
A:-Cored roll
B:-Surface rolls
C:-Central rolls
D:-Peripherally drilled rolls
Correct Answer:- Option-D
Question55:-What is the compression ratio of a cold feed extruder?
A:-1:1
B:-2.5:1
C:-1.08:1
D:-6.08:1
Correct Answer:- Option-B
Question56:-What type of compression mold is most suitable for extremely soft and
hard compounds?
A:-Straight
B:-Flash
C:-Positive
D:-Semi-positive
Correct Answer:- Option-C
Question57:-The efficiency of a machine is defined as the ratio of the output work
produced by the machine to _______.
 A:-the raw material used
B:-energy consumed
C:-labor work
D:-cost of machine
Correct Answer:- Option-B
Question58:-Which is the corrective maintenance of a machine?
A:-Lubricate rotating parts to prevent premature wear.
B:-Check machinery power to optimize energy efficiency.
C:-Repair or replace equipment before it fails.
D:-Disassembling parts and replacing a worn component.
Correct Answer:- Option-D
Question59:-Which device is used for constant temperature maintenance?
A:-Thermocouple
B:-Thermometer
C:-Thermostat
D:-Pyrometer
Correct Answer:- Option-C
Question60:-Which molding method is used for making carbonated beverage
bottles?
A:-Injection molding
B:-Extrusion blow molding
C:-Stretch blow molding
D:-Blow molding
Correct Answer:- Option-C
Question61:-The ratio of the die cross-section and extrudate cross-section is termed
as _______.
A:-L/D ratio
B:-Compression ratio
C:-Dieswell
D:-Fill factor
Correct Answer:- Option-C
Question62:-Some rubber processing machines are given below, which one has
interlocking rotors and rotates at the same speed.
A:-Mixing mill
B:-Banbury
C:-Intermix
D:-Kneader
 Correct Answer:- Option-C
Question63:-Which FRP process is most suitable for chemical storage tank
manufacturing?
A:-Centrifugal Casting
B:-Vacuum bag molding
C:-Hand layup
D:-Pultrusion
Correct Answer:- Option-A
Question64:-Which is the open method of FRP manufacturing?
A:-Pultrusion
B:-Continuous lamination
C:-Matched die molding
D:-Injection molding
Correct Answer:- Option-A
Question65:-Which standard system is used for the identification of the hazard
material for emergency response?
A:-OSHA
B:-NFPA 704
C:-NFPA 500
D:-ICSCS
Correct Answer:- Option-B
Question66:-The chemicals, which produce suffocation from lack of oxygen are
known as ______.
A:-Peroxides
B:-Narcotics
C:-Asphyxiants
D:-Carcinogens
Correct Answer:- Option-C
Question67:-LD 50 and LC 50 are the measurements of _______.
A:-fire resistance
B:-toxicity
C:-hazard rating
D:-oxidation
Correct Answer:- Option-B
Question68:-Which rubber-to-metal bonding system is most suitable for large
rubber roller manufacturing?
A:-Epoxy adhesives
 B:-Ebonite bonding
C:-Isocyanate bonding
D:-Brass-plating
Correct Answer:- Option-B
Question69:-Estimations done by standard iodine solutions are called _______.
A:-Iodometry
B:-Iodimetry
C:-Iodine absorption
D:-Iodolysis
Correct Answer:- Option-B

Question70:-
What is the meaning of this chemical hazard symbol?
A:-Flammable liquid
B:-Explosive
C:-Oxidizable liquid
D:-Open flame
Correct Answer:- Option-C
Question71:-Which indicator should be used for complexometric titrations?
A:-Starch
B:-Phenolphthalein
C:-Eriochrome black T
D:-Methyl orange
Correct Answer:- Option-C
Question72:-Which intermediate solution is used in iodometry for the estimation of
potassium dichromate?
A:-Potassium iodide
B:-Sodium thiosulphate
C:-Starch
D:-Buffer
Correct Answer:- Option-B
Question73:-The hardness of water is expressed in ______.
A:-Shore O
B:-Degree Celsius
C:-Degrees
 D:-Grams
Correct Answer:- Option-C
Question74:-Which of the following solution should be used for eye bathing, when
acids get in the eyes at the laboratory?
A:-2%
B:-2%
C:-2%
D:-2%
Correct Answer:- Option-C
Question75:-Solutions of a weak acid and its conjugate base or weak base and its
conjugate acid can maintain pH is known as _______.
A:-Indicator
B:-Titrant
C:-EDTA
D:-Buffer
Correct Answer:- Option-D
Question76:-How do you make o.1N aqueous solution?
A:-40 gm in 1 litre water
B:-400 gm in 1000 ml water
C:-4 gm in 1000 ml water
D:-40 gm in 100 ml water
Correct Answer:- Option-C
Question77:-Which of the given parameter value increases with the magnesium
content?
A:-KOH number
B:-DRC
C:-Coagulum content
D:-Sludge content
Correct Answer:- Option-D
Question78:-Hearing protection is required when noise levels exceed OSHA's PEL of
_____ dBA.
A:-80
B:-90
C:-100
D:-110
Correct Answer:- Option-B
Question79:-Which equipment is used in the determination of the KOH Number of
latex?
A:-Markham still
B:-Kjheldhal
C:-pH meter
D:-Condenser
Correct Answer:- Option-C
Question80:-Which of the following chemical is used as a coagulating agent in the
VFA number determination of latex?
A:-10% Ammonium sulfate
B:-30% Ammonium sulfate
C:-30% Ammonium acetate
D:-50% Ammonium acetate
Correct Answer:- Option-B
Question81:-What is the function of an Electrostatic precipitator in industries?
A:-Device for pneumatic system
B:-Device for electrical heating
C:-Device for material handling
D:-Device for pollution control
Correct Answer:- Option-D
Question82:-Which of the following is most considered for approved eye protection
in labs?
A:-goggles
B:-goggle glasses meeting ANSI standard Z57
C:-Reading glasses
D:-Goggle glass meeting ANSI standard Z87
Correct Answer:- Option-D
Question83:-Which is calculated as the percentage of the specimen's permanent
deformation to its original thickness?
A:-Compression set under a constant deflection
B:-Compression set under a constant force
C:-Tension set under a constant strain
D:-Tension set under a constant force
Correct Answer:- Option-B
Question84:-The hazard rating diamond of a chemical label is marked 3 in the blue
zone. What does this mean?
A:-The chemical is a minimum health hazard
B:-The chemical is moderately explosive
 C:-The chemical is a simple asphyxiant
D:-The chemical is a serious health hazard
Correct Answer:- Option-D
Question85:-Which part of analytical balance is directly linked with central agate?
A:-Pans
B:-Stirrups
C:-Pointer
D:-Lever
Correct Answer:- Option-D
Question86:-If the rider is placed at the small division from the center of the
beam on the right side, then the effective mass due to the rider is _______.
A:-2 mg
B:-0.002 mg
C:-0.2 mg
D:-2 gm
Correct Answer:- Option-A
Question87:-What is the first remedy for bromine burn accidents in the laboratory?
A:-Wash with water and olive oil
B:-Wash with petrol and apply olive oil
C:-Wash with alkali and waer
D:-Wash with glycerin and alkali
Correct Answer:- Option-B
Question88:-Which laboratory flask is used for Vacuum filtration?
A:-Conical flask
B:-Kjheldhal flask
C:-Buchner flask
D:-Pear-shaped flasks
Correct Answer:- Option-C
Question89:-The filled volume of an internal mixer = ________.
A:-Filled volume*Specific gravity of mix
B:-Net chamber volume*Fill factor
C:-Volume cost/density
D:-Total mass/density
Correct Answer:- Option-B
Question90:-Which curing system is suitable for the epoxy resin to obtain high alkali
resistance?
 A:-Acid
B:-Anhydride
C:-Amine
D:-Alkali
Correct Answer:- Option-C
Question91:-What is the function of styrene in UP-resin compounding?
A:-The curing agent of UP resin
B:-Filler
C:-Diluent of UP resin
D:-Increase the viscosity of UPresin
Correct Answer:- Option-C
Question92:-Which catalyst is used for elevated temperature of curing of UP resin?
A:-Methyl ethyl ketone peroxide
B:-Cyclohexanone peroxide
C:-Cobalt naphthenate
D:-Benzoyl peroxide
Correct Answer:- Option-D
Question93:-Which promotes good adhesion between fibrous reinforcement and
resin matrix?
A:-MEKP
B:-Styrene
C:-Vinyl trichlorosilane
D:-Clay
Correct Answer:- Option-C
Question94:-Which is used as a UV stabilizer?
A:-Antimony trioxide
B:-PPD
C:-Benzotriazole
D:-Lead oxide
Correct Answer:- Option-C
Question95:-Which ingredient increases the tinctorial power and fastness to light of
rubber product?
A:-Carbon black
B:-Clay
C:-Titanium dioxide
D:-Calcium carbonate
 Correct Answer:- Option-C
Question96:-Which is used as a co-agent in peroxide curing of rubber?
A:-Ethylene thio urea
B:-Try allyl isocyanurate
C:-Thiuramdisulphide
D:-Thiazoles
Correct Answer:- Option-B
Question97:-What is the function of ethylene thio urea in Chloroprene rubber
compounding?
A:-Acid absorbent
B:-Accelerator
C:-Antioxidant
D:-Activator
Correct Answer:- Option-B
Question98:-Which type of carbon black increases the conductivity of rubber
compounds?
A:-Acetylene black
B:-ISAF
C:-Thermal black
D:-GPF
Correct Answer:- Option-A
Question99:-Which is the most suitable reinforcing filler for fluorocarbon rubbers?
A:-ISAF
B:-Clay
C:-Medium thermal black
D:-Precipitated silica
Correct Answer:- Option-C
Question100:-Which curing system is suitable for saturated rubbers for high-
temperature resistance?
A:-Sulphur-CV system
B:-Sulphur-EV system
C:-Peroxide
D:-Metal oxide
Correct Answer:- Option-C