A. Soft & tacky at room temperature
B. An isomer of natural rubber
C. A thermosetting resin
D. Recovered by coagulation of rubber latex
Related Mcqs:
- 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. - 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. - 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 - 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 - 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 - The monomer for the production of neoprene rubber is_________________?
A. Acetylene
B. Chloroprene
C. Isoprene
D. None of these - Main constituent of natural rubber is_________________?
A. Polystyrene
B. Polyisoprene
C. Polybutadiene
D. Poly chloroprene - 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 - Vulcanisation of rubber decreases its__________________?
A. Tensile strength
B. Resistance to organic solvents
C. Tackiness
D. Working temperature range - 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
