Related Mcqs:

1. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex ?

   A. Ammonium alum
   B. Potassium alum
   C. Both A. & B.
   D. Neither A. nor B.

2. Styrene butadiene rubber (SBR) as compared to natural rubber has_______________?

   A. Poor tensile strength
   B. Poorer resistance
   C. Greater amount of heat build up heavy loading
   D. All A., B. and C.

3. Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxidant used in rubber ?

   A. Carbon
   B. Alkylated diphenyl amine
   C. Thiokol
   D. Magnesium

4. Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness ?

   A. Phosphorous
   B. Carbon black
   C. Pine oil
   D. Rosin

5. Neoprene which is used for making shoe heels & belts is superior to natural rubber in its stability to aerial oxidation and resistance to oils & other solvents. The monomer used for making neoprene is_________________?

   A. Chloroethane
   B. Chloroprene
   C. Isoprene
   D. None of these

6. The monomer for the production of neoprene rubber is_________________?

   A. Acetylene
   B. Chloroprene
   C. Isoprene
   D. None of these

7. Main constituent of natural rubber is_________________?

   A. Polystyrene
   B. Polyisoprene
   C. Polybutadiene
   D. Poly chloroprene

8. Mastication of rubber means_______________?

   A. Its softening
   B. A treatment to retard its deterioration due to oxidation
   C. Improving its curing rate
   D. Depression of its freezing point

9. Vulcanisation of rubber decreases its__________________?

   A. Tensile strength
   B. Resistance to organic solvents
   C. Tackiness
   D. Working temperature range

10. Out of all the elastomers, natural rubber has the longest elongation range & flexibility of the order of _______________ percent?

    A. 1-1000
    B. 1000-1500
    C. 1500-2000
    D. 2000-2500