Natural Rubber MCQs Questions Answers

By: Prof. Fazal Rehman Shamil
Last modified on April 27th, 2021

Natural Rubber MCQs Questions Answers

In ____ the cis-poly isoprene is present.
(A). Gutta rubber
(B). Guayule rubber
(C). Percha rubber
(D). Hevea rubber
(E). None of these
Multiple Choice Question Answer: Hevea rubber
The filtered latex is fed into long rectangular tanks of ____deep when producing the smoked rubber.
(A). 30cm
(B). 2m
(C). 50cm
(D). 1m
(E). None of these
Multiple Choice Question Answer: 30cm
The latex and reacted with formic acid, the vertical partition plates are inserted and left undisturbed for ____ during the production of smoked rubber.
(A). 16 hours
(B). 14 hours
(C). 15 hours
(D). 13 hours
(E). None of these
Multiple Choice Question Answer: 16 hours
After applying the ___ stress, the temporary deformation of rubber takes place.
(A). 600e.u
(B). 500e.u
(C). More than 600e.u
(D). more than 500e.u
(E). None of these
Multiple Choice Question Answer: More than 600e.u
_____ is the reason of elasiticity of rubber.
(A). Helix
(B). Octahedral
(C). Pentagonal bipyramidal
(D). Trigonal planar
(E). None of these
Multiple Choice Question Answer: Helix
In soft____ colors mass the rubber is coagulated.
(A). White
(B). Light yellow
(C). Yellow
(D). Light pink
(E). None of these
Multiple Choice Question Answer: White
The coagulum is passed between two rollers of about___wide when producing the crepe rubber.
(A). 50cm
(B). 4mm
(C). 3mm
(D). 100cm
(E). None of these
Multiple Choice Question Answer: 50cm
The rubber sheets are hanged in smoked chambers at ______to produce the smoked rubber.
(A). 40-50oC
(B). 20-30oC
(C). 30-40oC
(D). 10-20oC
(E). None of these
Multiple Choice Question Answer: 40-50oC
The mature leaves are grounded and heated about ____ in the solvent extraction process.
(A). 70oC
(B). 50oC
(C). 60oC
(D). 40oC
(E). None of these
Multiple Choice Question Answer: 70oCs
_____ latex is diluted and filtered to remove suspended impurities.
(A). 15-20%
(B). 10-15%
(C). 5-10%
(D). 20-25%
(E). None of these
Multiple Choice Question Answer: 15-20%
The sheets are hanged for about _________ in smoked chambers during the production of the smoked rubber.
(A). 1 day
(B). 4 days
(C). 3 days
(D). 2 days
(E). None of these
Multiple Choice Question Answer: 4 days
To extract _____ solvent extraction process is used.
(A). Gutta percha
(B). Smoked rubber
(C). Crepe rubber
(D). Guayule rubber
(E). None of these
Multiple Choice Question Answer: Gutta percha
With the ___ the filtered latex is treated when it is sent into the tanks.
(A). Poly isoprene
(B). Formaldehyde
(C). Acetaldehyde
(D). Acetic acid
(E). None of these
Multiple Choice Question Answer: Acetic acid
If the property of elastic is possessed by the polymers then it is called rubber.
(A). False
(B). True
(C). Partially True
Multiple Choice Question Answer: True

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Prof. Fazal Rehman Shamil