Your cart is empty.
Practice each question, then open the answer or worked solution.
Which of the following polymers of glucose are stored by animals?
(A) Cellulose
(B) Amylose
(C) Amylopectin
(D) Glycogen
Ans: Option (D)
Explanation:
Glycogen is a branched polymer of glucose found in the liver, muscles, and brain of animals.
Which of the following is not a semisynthetic polymer?
(A) cis-polyisoprene
(B) Cellulose nitrate
(C) Cellulose acetate
(D) Vulcanised rubber
Ans: Option (A)
Explanation:
Semi-synthetic polymers are obtained from natural polymers. Cellulose derivatives like cellulose nitrate, cellulose acetate rubber are examples of semi-synthetic polymers.
Cis-polyisoprene is not a semi-synthetic polymer while other examples are semi-synthetic polymer.
The commercial name of polyacrylonitrile is ______________.
(A) Dacron
(B) Orlon (acrilan)
(C) PVC
(D) Bakelite
Ans: Option (B)
Explanation:
Polyacrylonitrile is used as a wool substitute in the manufacture of commercial fibers such as orlon or acrilan.
Which of the following polymers is biodegradable?
(A)
(B)
(C)
(D)
Ans: Option (C)
Explanation:
PHBV(Poly beta-hydroxybutyrate co-beta-hydroxy valerate) is a biodegradable polymer. It undergoes bacterial degradation in the environment. The structure is shown as,
In which of the following polymers ethylene glycol is one of the monomer units?
(A)
(B)
(C)
(D)
Ans: Option (A)
Explanation:
Dacron or Terylene is formed by the condensation polymerization of ethylene glycol and phthalic acid with the elimination of water molecules. The structure of Terylene is,
Which of the following statements is not true about low density polythene?
(A) Tough
(B) Hard
(C) Poor conductor of electricity
(D) Highly branched structure
Ans: Option (B)
Explanation:
Low-density polythene is obtained from the polymerization of ethane under high pressure and temperature. Low-density polyethylene is tough, a poor conductor of electricity and has a highly branched structure.
Low-density polythene is not hard because branched structure prevents stacking and thus, reduces the intermolecular force of attraction.
So, option (B) is correct.
(A)
(B)
(C)
(D)
Ans: Option (A)
Explanation:
Which of the following polymer can be formed by using the following monomer unit?
(A) Nylon-6,6
(B) Nylon 2–nylon 6
(C) Melamine polymer
(D) Nylon-6
Ans: Option (D)
Explanation:
The given structure is caprolactam. Nylon-6 is prepared from the monomer caprolactam. It is obtained by heating caprolactam with water at a high temperature.
Which of the following polymers need at least one di ene monomer for their preparation?
(A) Dacron
(B) Buna-S
(C) Neoprene
(D) Novolac
Ans: Option (B) and (C)
Explanation:
Buna-S and neoprene are the polymers that needs at least one diene monomeric unit. Buna- S is a polymer formed from the polymerization of 1,3-butadiene and styrene. While, Neoprene is formed by the polymerisation of chloroprene.
Which of the following are characteristics of thermosetting polymers?
(A) Heavily branched cross linked polymers.
(B) Linear slightly branched long chain molecules
(C) Become infusible on moulding so cannot be reused.
(D) Soften on heating and hardened on cooling, can be reused.
Ans: Option (A) and (C)
Explanation:
Thermosetting polymers are cross linked polymers. These polymers on heating undergo cross linking in moulds. They become infusible on heating so cannot be reused again.