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Polymers Test - 18

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Polymers Test - 18
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  • Question 1
    1 / -0
    Monomer of PTFE is:
    Solution
    Poly tetrafluoroethylene (PTFE) is also known as Teflon. It is manufactured by heating tetrafluoroethylene with a free radical or persulphate catalyst at high pressures.

    $$n CF_{2} = CF_{2} \xrightarrow [High\: pressure]{catalyst} -[CF_{2}-CF_{2}-] _{n}$$

    Tetrafluoroethane                      Teflon / PTFE

  • Question 2
    1 / -0
    The most common type of molecular weights used in the case of polymer is :
    Solution
    The most common type of molecular weights used in the case of polymers is number average molecular weight method.
    It gives the relationship between the number of moles of each polymer species ($$N_i$$) and the molar mass ($$M_i$$) of that species as, $$M_n=\dfrac {\Sigma M_iN_i}{\Sigma Ni}$$.
  • Question 3
    1 / -0
    Which of the following is poor resistant to weather?
    Solution
    Polystyrene is poor resistant to weather. It is a white thermoplastic material which is transparent and floats on water.
  • Question 4
    1 / -0
    Which of the following has extreme resistance to abrasion?
    Solution
    Nylon and perlon-L have extreme resistance to abrasion.
    When a product has abrasion resistance, it will resist erosion caused by scraping, rubbing and other types of mechanical wears.  
  • Question 5
    1 / -0
    Common application of GRN in life is :
  • Question 6
    1 / -0
    Which of the following is used as a substitute of glass?
    Solution
    Poly methyl methaacrylate is a transparent thermoplastic polymer. It is often used as a substitute of glass.

  • Question 7
    1 / -0
    Which of the following is resistant to petrol, lubricating oils and organic solvents?
    Solution
    All the three nitrile rubber,buna n and grn are resistant to petrol, lubricant oil and organic solvent ..so option d is answer 
  • Question 8
    1 / -0
    What is not true about polymers?
    Solution
    Polymers have high molecular weight as they contain a large number of repeating structural units. They are macromolecules. The range of the molecular mass is $$10^3$$ to $$10^7 u$$.
  • Question 9
    1 / -0
    Which of the following fibres are made of polyamides?
    Solution
    Nylon fibres are made of polyamides. They contain amide linkages.
    For example:
    (i) Nylon -6 is obtained by polymerization of 6-aminohexanoic acid.
    (ii) Nylon-6,6 is obtained by condensation polymerization of hexamethylenediamine with adipic acid.
  • Question 10
    1 / -0
    Which of the following is an elastomer?
    Solution
    Elastomers are rubber-like solids polymer chains held together by the weakest intermolecular forces. These weak binding forces permit the polymer to be stretched.
    Examples: $$Buna-S, Buna-N, neoprene$$ etc.
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