GATE XE 2021 Paper 1 — page 43

Questions 127–129 of 175. Imported answers require review unless explicitly marked reviewed.

The behavior of a polymer is described by a Maxwell model consisting of a spring element of modulus 10¹⁰ Pa in series with a dashpot of viscosity 10¹² Pa s. In the solid, 50 s after the sudden application of a fixed strain of 1%, the stress (rounded off to 2 decimal places) will be ______ × 10⁷ Pa.

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A particular free radical polymerization process yields a polymer with a number average degree of polymerization,

= 100. The monomer concentration is doubled and the initiator concentration is increased by four times. Assuming that all rate coefficients and other parameters remain unchanged, the value of

(rounded off to the nearest integer) is ______.

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A polymer is synthesized from 2 moles of terephthalic acid (molecular weight of the repeat unit, (-OCC₆H₄CO-), is 132 g/mol), 1 mol of ethylene glycol (molecular weight of the repeat unit, (-OCH₂CH₂O-), is 60 g/mol), and 1 mol of butylene glycol (molecular weight of the repeat unit, (-O(CH₂)₄O-), is 88 g/mol). The reaction is terminated at 99% conversion of the acid. The number averaged molecular weight,

(rounded off to the nearest integer) is ______ g/mol.

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2021 · Paper 1

Question 18

Question 19

Question 20