GATE XE purpose:exam-prep PYQs & Answers — Page 85

Questions 841–850 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 85 of 178

From the dynamic mechanical analysis of a polymer sample with a phase angle of 30°, the relationship between storage modulus (E') and loss modulus (E'') can be expressed as

Your answerChoose one option.

E' = √3 E''

2E' = √3 E''

E'' = √3 E'

2E'' = √3 E'

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the properties in Column A with their respective unit in Column B

Column A: P. Surface resistivity Q. Volume resistivity R. Coefficient of thermal expansion S. Electrical conductivity

Column B:

Ohm-cm

S cm⁻¹

Ohm

K⁻¹

Your answerChoose one option.

P-1; Q-3; R-4; S-2

P-2; Q-3; R-1; S-4

P-3; Q-1; R-4; S-2

P-3; Q-1; R-2; S-4

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following polymer product with its most appropriate processing technique

Polymer product: P. Bottle Q. Blister packaging R. Reinforced electric poles S. Sewage pipes

Processing technique:

Extrusion

Pultrusion

Injection blow molding

Thermoforming

Your answerChoose one option.

P-3; Q-4; R-1; S-2

P-3; Q-4; R-2; S-1

P-4; Q-3; R-2; S-1

P-3; Q-2; R-4; S-1

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following additives to their respective functions

Additive: P. p-phenylenediamine Q. Trisyl phosphate R. Polybutadiene rubber S. Talc

Function:

Flame retardant

Impact modifier

Nucleating agent

Antioxidant

Your answerChoose one option.

P-4; Q-2; R-1; S-3

P-3; Q-1; R-2; S-4

P-4; Q-1; R-3; S-2

P-4; Q-1; R-2; S-3

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the polymers with their characteristic infrared (IR) stretch frequency

Polymer: P. Polyurethane Q. Polyethylene R. Polysulfone S. Acrylonitrile-butadiene-styrene copolymer

IR stretch (cm⁻¹):

~234

~151

~1720

~2914

Your answerChoose one option.

P-4; Q-3; R-2; S-1

P-3; Q-4; R-2; S-1

P-3; Q-4; R-1; S-2

P-3; Q-2; R-4; S-1

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the following polymers to the most appropriate product

Polymer: P. Expanded polystyrene Q. Polyether ketone R. Polycarbonate S. Poly(butylene terephthalate)

Product:

Motor bearings

TV cabinet

Sound proof walls

Safety glass

Your answerChoose one option.

P-2; Q-1; R-4; S-3

P-2; Q-4; R-1; S-3

P-3; Q-1; R-2; S-4

P-3; Q-1; R-4; S-2

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the polymers to the polymerization method used for their synthesis.

Polymer	Polymerization method
P. Linear low density polyethylene	1. Ring opening
Q. Nylon 6	2. Ziegler-Natta
R. Styrene-butadiene rubber	3. Condensation
S. Aromatic polyamide	4. Emulsion

Your answerChoose one option.

P-2; Q-1; R-4; S-3

P-2; Q-1; R-3; S-4

P-2; Q-3; R-4; S-1

P-2; Q-4; R-1; S-3

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

If 5 g of a monodisperse polystyrene sample of molecular weight 10,000 g mol

is mixed with 15 g of another monodisperse polystyrene sample of molecular weight 20,000 g mol

, then the polydispersity of the resulting mixture is ________ (rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

For a polymer sample with a viscosity of

poise, if the apparent plateau modulus of

dyne cm

drops to zero above a certain temperature, the relaxation time of the polymer is ________ days (rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The thermal conductivity values of glass fiber and epoxy resin are 1.05 W m

and 0.25 W m

, respectively. The thermal conductivity of a glass fiber reinforced epoxy composite with a fiber content of 60% by volume along the fiber direction is ________ W m

(rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE purpose:exam-prep PYQs

Question 119

Question 120

Question 121

Question 122

Question 123

Question 124

Question 125

Question 126

Question 127

Question 128