Description : For obtaining vinyl chloride acetate, the method used, is (A) Addition polymerization (B) Condensation polymerization (C) Co-polymerization (D) None of these
Last Answer : Answer: Option C
Description : Explain addition polymerization for polystyrene.
Last Answer : Explain addition polymerization for polystyrene. Ans : Synthesis - Styrene (C6H5CH=CH2) , undergoes addition polymerization to form polystyrene , --( C6H5CH=CH2)- It is prepared by the ... is stronger than the π bond that was broken, thus it is difficult to depolymerize polystyrene.
Description : Which of following statements is false about propane? (a) all bond angles are 109.5° (b) each carbon is sp3 hybridized (c) the compound is combustible (d) the compound undergoes polymerization to give polypropylene.
Last Answer : the compound undergoes polymerization to give polypropylene.
Description : __________ is normally used for the manufacture of refrigerator components and transistor parts. (A) Polypropylene (B) Polystyrene (C) Polyester (D) Polyurethane
Last Answer : (B) Polystyrene
Description : Which of the following is a copolymer? (A) Polystyrene (B) SBR (C) PTFE (D) Polypropylene
Last Answer : (B) SBR
Description : Benzoyl chloride is not used as a catalyst in the manufacture of (A) Polystyrene (B) Polyvinyl acetate (C) Polypropylene (D) Polyvinyl chloride-co-vinyl acetate
Last Answer : (C) Polypropylene
Description : Hot drink (e.g., tea) cups are usually made of (A) Polystyrene (B) Polythene (C) Polypropylene (D) PVC
Last Answer : (A) Polystyrene
Description : Which of the following is not a polyolefin? (A) Polystyrene (B) Polypropylene (C) Neoprene (D) None of these
Last Answer : (C) Neoprene
Description : Contact lenses for eyes are made of Perspex, which is nothing but (A) poly-methyl-methacrylate (B) Polystyrene (C) Unsaturated polyester (D) Polypropylene
Last Answer : (A) poly-methyl-methacrylate
Description : Which of the following are addition polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) both I and II
Last Answer : both I and II
Description : The product of addition polymerization reaction is:
Last Answer : The product of addition polymerization reaction is: A. PVC B. nylon C. terylene D. polyamide
Description : What is addition polymerization ?
Last Answer : Ans: A chemical reaction in which monomer unit is repeated to produce a molecule without losing of molecule like water or ammonia. Ex. Polythene, Polyvinyl chloride
Description : Differentiate between addition and condensation polymerization process.
Last Answer : Differentiate between addition and condensation polymerization: Addition polymerization Condensation polymerization Produces by addition of monomers Produces by condensation of monomers Monomers must have ... multiple of monomers e.g. Polypropylene e.g. Bakelite
Description : Define polymerization. Explain addition polymerization with at least one example.
Last Answer : Polymerization: - The process in which a large number of small molecules (monomers) linking together to form a large molecule (polymer) under specific conditions of temperature, pressure & catalyst is ... catalyst. iv) No byproduct is obtained. v) It yields polymer having linear chain structure.
Description : Name the monomer of polyvinylchloride.
Last Answer : Ans: Vinylcloride.
Description : In the method of condensation polymerization, (A) Low-molecular substances are removed from the high molecular substance (B) The reaction proceeds with an evolution of ammonia (C) The reaction proceeds with an evolution of hydrogen chloride (D) All of the above
Last Answer : Answer: Option D
Description : A postcard of private manufacture of more than prescribed size and thickness was found in delivery office. The article a) Taxed with double the amount b) Return to office of posting c) Was ... difference between min postage payable on a letter and postage already paid was charged d) None of these
Last Answer : c) Was treated as letter and difference between min postage payable on a letter and postage already paid was charged
Description : Air pollution causes A. Global warming B. Respiratory problems C. Soil erosion D. None of these
Last Answer : B. Respiratory problems
Description : Addition polymerisation is not involved in the manufacture of (A) Low density polythene (B) Poly vinyl chloride (C) Polystyrene (D) Polyhexamethylene adipamide
Last Answer : (D) Polyhexamethylene adipamide
Description : Polymerization helps to improve the property of (A) Strength (B) Rigidity (C) Elasticity (D) All of these
Description : Which one of the following polymers is obtained from condensation polymerization? (A) Phenol formaldehyde (B) Carbamide (C) Melamine-formaldehyde (D) All of these
Description : The technique of obtaining large number plantlets by tissue culture method is called
Last Answer : The technique of obtaining large number plantlets by tissue culture method is called A. ... . organ culture C. micropropagation D. macropropagation
Description : What is the most accurate method of obtaining project information that can reduce the amount of risk? 1. Observations on the current project 2. Determining the risk by using brainstorming ... from previous projects that were similar in nature 4. Sensitivity analysis 5. Delphi technique.
Last Answer : 3. The use of historical data from previous projects that were similar in nature
Description : The technique of obtaining large number of plantlets by tissue culture method is called (a) plantlet culture (b) organ culture (c) micropropagation (d) macropropagation.
Last Answer : (c) micropropagation
Description : Point out the correct statement. a) Service Oriented Architecture (SOA) describes a standard method for requesting services from distributed components and managing the results b) SOA provides the ... written in different languages and can use multiple messaging protocols d) All of the mentioned
Last Answer : All of the mentioned
Description : Explain the method for obtaining instrument air in industry.
Last Answer : Instrument air: Air is passed through a filter to remove suspended impurities. The filtered air is supplied to the compressor. Discharge from the compressor will be at a pressure of 100 to 150 ... pressure regulator is sometimes added to provide a constant reduced pressure in the supply line.
Description : Is polypropylene biodegradable?
Last Answer : Polypropylene can be biodegradable if it is made with EBD(enhanced bio decompositions) which can be easily broken down,fairly quickly, back to base compounds. A variety of packaging cannow use biodegradable polypropylene.
Description : What is the difference between polypropylene and PVC?
Last Answer : PVC is the most common plastic used in book covering materials, and has been used for many years. Polypropylene has become more common recently. Both of these plastics have different handling characteristics. PVC is ... plastic. PVC is known to have a low level of acidity. PVC is cheaper than PP.
Description : Nylon is made up of : (1) Polyamide (2) Polyester (3) Polyethylene (4) Polypropylene
Last Answer : (1) Polyamide Explanation: Nylon is a generic designation for a family of synthetic polymers known generically as aliphatic polyamides. It is one of the most commonly used polymers.
Description : Most of the fibre forming polymers are crystalline in nature, one of the exceptions being __________ which is amorphous in nature. (A) Nylon (B) Polyacrylonitrile (C) Polypropylene (D) Polyester
Last Answer : (B) Polyacrylonitrile
Description : Commercial production of polypropylene employs __________ polymerisation. (A) Emulsion (B) Suspension (C) Solution (D) Bulk
Last Answer : (C) Solution
Description : In step growth polymerisation, condensation occurs in a stepwise manner with or without the elimination of smaller molecules. An example of step growth polymerisation product is (A) Terylene (B) Polybutadiene (C) PVC (D) Polypropylene
Last Answer : (A) Terylene
Description : Melt spinning of polymers involves the forcing of polymer melt through spinnerates (fine holes) into an atmosphere kept at a temperature lower than the melting point of the polymer, which causes the fine diameter ... the __________ fibres. (A) Acrylic (B) Polyester (C) Nylon 6:6 (D) Polypropylene
Last Answer : (A) Acrylic
Description : Polypropylene is preferred to polythene, because the former is (A) Non-inflammable (B) Harder (C) Stronger (D) Both (B) & (C)
Last Answer : (D) Both (B) & (C
Description : __________ is a copolymer. (A) Nylon-66 (B) Polypropylene (C) PVC
Last Answer : (A) Nylon-66
Description : Vinyl flooring is done using __________ sheets. (A) Polypropylene (B) PVC (C) Polythene (D) Polyvinyl acetate
Last Answer : (B) PVC
Description : Flexible plastic pipes are made of (A) High density polyethylene (HDPE) (B) Low density polyethylene (LDPE) (C) Polypropylene (D) Unsaturated polyester
Last Answer : (B) Low density polyethylene (LDPE)
Description : Liners of bags are usually made of (A) Polythene (B) PVC (C) Polypropylene (D) Polyesters
Description : Identify the group in which all the polymers mentioned can be used to make fibres. (A) Butadiene copolymers, Polyamides, Urea-formaldehyde (B) Cellulose derivatives, Polyisoprene, Polyethylene (C) Cellulose derivatives, Polyamides, Polyurethane (D) Polypropylene, Poly vinyl chloride, Silicon
Last Answer : (B) Cellulose derivatives, Polyisoprene, Polyethylene
Description : Polypropylene compared to polythene is (A) Harder (B) Stronger (C) Lighter (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : The most commonly used resin for making reinforced plastic is (A) Unsaturated polyester (B) Polypropylene
Last Answer : (A) Unsaturated polyester
Description : Color development in tomato fruit is due to a. Lycopene b. Carotenoid c. Polypropylene d. All of above
Last Answer : Lycopene
Description : Which of the following are condensation polymers? I. Polypropylene II. Teflon III. Nylon (a) Only I (b) Only II (c) Only III (d) Both II and III
Last Answer : Only III
Description : Which of the following is an example of a condensation polymer? (a) Nylon-6,6 (b) Teflon (c) Polypropylene (d) Orlon
Last Answer : Nylon-6,6
Description : Insulation of liquid surface can be achieved by __________ on top of its surface. (A) Floating hollow polypropylene spheres (B) Spraying alumina powder (C) Putting cement (D) None of these
Last Answer : (A) Floating hollow polypropylene spheres
Last Answer : Polyamide
Description : The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as (A) Plane alidade (B) Telescopic alidade (C) Clinometer (D) Tacheometer
Last Answer : (B) Telescopic alidade
Description : Muller Breslau's principle for obtaining influence lines is applicable to (i) Trusses (ii) Statically determinate beams and frames (iii) Statically indeterminate structures, the material of which is elastic and follows Hooke's law (iv ... B) (i), (ii) and (iv) (C) (i) and (ii) (D) Only (i)
Last Answer : (A) (i), (ii) and (iii)
Description : Soundings are required for (A) Making nautical charts for navigation (B) Ascertaining the areas subject to scour or silting (C) Obtaining detailed information for construction (D) All the above
Last Answer : (D) All the above