GATE XE purpose:exam-prep PYQs & Answers — Page 13

Questions 121–130 of 1772. Imported answers require independent review unless marked reviewed.

Select the correct option to match the Polymer to its most suitable Monomer(s) from the table given below:

Polymer	Monomer(s)
P — Poly(p-phenylene sulfide)	I
Q — Poly(ether sulfone)	II
R — Poly(ether ether ketone)	III
S — Polycarbonate	IV

Monomer structures are shown in

Diagram for Engineering Sciences question 121

Your answerChoose one option.

P–II ; Q–IV ; R–III ; S–I

P–II ; Q–IV ; R–I ; S–III

P–IV ; Q–III ; R–II ; S–I

P–IV ; Q–I ; R–III ; S–II

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Select the correct option to match the Compound/Additive to its most suitable Function from the table given below:

Your answerChoose one option.

P–IV ; Q–III ; R–II ; S–I

P–III ; Q–IV ; R–II ; S–I

P–I ; Q–III ; R–II ; S–IV

P–III ; Q–IV ; R–I ; S–II

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The variation of steady shear viscosity (

) of a polymer melt with shear rate (

) is shown in the figure, where

is the upper limit of the applied shear rate. Which one of the following figures, labeled P, Q, R and S, shows the most appropriate variation of shear stress (

) with shear rate for the same polymer melt?

Diagram for Engineering Sciences question 123

Diagram for Engineering Sciences question 123 (figure 2)

Your answerChoose one option.

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Select the correct option to match the Initiator(s) with the Method of polymerization from the table given below:

Your answerChoose one option.

P–II ; Q–III ; R–IV ; S–I

P–IV ; Q–I ; R–II ; S–III

P–III ; Q–II ; R–IV ; S–I

P–II ; Q–I ; R–IV ; S–III

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Select the correct option to match the Characterization technique with the Information that is obtained using these techniques.

Your answerChoose one option.

P–IV ; Q–III ; R–I ; S–II

P–III ; Q–IV ; R–I ; S–II

P–IV ; Q–II ; R–I ; S–III

P–II ; Q–IV ; R–I ; S–I

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Which of the following options is/are used to plasticize poly(vinyl chloride (PVC)?

Your answerSelect all correct options. You can choose more than one.

Addition of vinyl acetate comonomer during the synthesis of PVC

Chlorination of PVC

Addition of di-iso-octyl phthalate during processing of PVC

Addition of dicumyl peroxide during processing of PVC

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A certain amount of plasticizer with a glass transition temperature (T_g) of −50 °C was added to a polymer to reduce its T_g from 70 °C to 30 °C. Using the Fox equation, the weight fraction of the plasticizer used is ______________ (rounded off to two decimal places).

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A rectangular plastic specimen with a cross-sectional area of 240 mm

is subjected to tension with a force of 1500 N resulting in elastic deformation. If the Young’s modulus of the specimen is 34.55 MPa, the value of strain is ______________ (rounded off to two decimal places).

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Equimolar mixture of terephthalic acid and butylene glycol was taken to synthesize a polyester. The reaction was stopped at 99.6% conversion of the acid monomer. The weight average molecule weight (

) of the synthesised polyester is ______________ g/mol (rounded off to the nearest integer).

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A viscoelastic polymer is subjected to a constant strain of 0.3. The behavior of the polymer follows Maxwell model of linear viscoelasticity. Elastic modulus of the polymer is 5 MPa and the relaxation time is 200 days. The stress in the polymer after 100 days from the initial application of the strain is ______________ MPa (rounded off to two decimal places).

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GATE XE purpose:exam-prep PYQs

Question 121

Question 122

Question 123

Question 124

Question 125

Question 126

Question 127

Question 128

Question 129

Question 130