Natural Rubber MCQs Questions Answers

1. In ____ the cis-poly isoprene is present.

(A) Gutta rubber

(B) Hevea rubber

(C) Percha rubber

(D) Guayule rubber

2. The filtered latex is fed into long rectangular tanks of ____ deep when producing the smoked rubber.

(A) 50cm

(B) 2m

(C) 30cm

(D) 1m

3. The latex is reacted with formic acid, vertical partition plates are inserted and left undisturbed for ____ during the production of smoked rubber.

(A) 15 hours

(B) 14 hours

(C) 16 hours

(D) 13 hours

4. After applying the ___ stress, the temporary deformation of rubber takes place.

(A) 600e.u

(B) More than 600e.u

(C) 500e.u

(D) More than 500e.u

5. _____ is the reason of elasticity of rubber.

(A) Trigonal planar

(B) Octahedral

(C) Pentagonal bipyramidal

(D) Helix

6. In soft ____ colored mass the rubber is coagulated.

(A) Light yellow

(B) White

(C) Yellow

(D) Light pink

7. The coagulum is passed between two rollers of about ___ wide when producing the crepe rubber.

(A) 3mm

(B) 4mm

(C) 50cm

(D) 100cm

8. The rubber sheets are hanged in smoked chambers at ______ to produce the smoked rubber.

(A) 20-30°C

(B) 40-50°C

(C) 30-40°C

(D) 10-20°C

9. The mature leaves are grounded and heated about ____ in the solvent extraction process.

(A) 40°C

(B) 50°C

(C) 60°C

(D) 70°C

10. _____ latex is diluted and filtered to remove suspended impurities.

(A) 20-25%

(B) 10-15%

(C) 5-10%

(D) 15-20%

11. The sheets are hanged for about _________ in smoked chambers during the production of the smoked rubber.

(A) 1 day

(B) 2 days

(C) 3 days

(D) 4 days

12. To extract _____ solvent extraction process is used.

(A) Gutta percha

(B) Smoked rubber

(C) Crepe rubber

(D) Guayule rubber

13. With the ___ the filtered latex is treated when it is sent into the tanks.

(A) Poly isoprene

(B) Formaldehyde

(C) Acetaldehyde

(D) Acetic acid