Engineering Questions with Answers - Multiple Choice Questions
Separation Processes MCQ’s – Membrane Materials
1 - Question
By which reaction are synthetic polymers not made?
a) Condensation
b) Free radical addition
c) Ion-catalyzed addition
d) Hydroxylation
View Answer
Explanation: Hydroxylation reaction cannot make a polymer or cannot form a long chain, hence not used to make synthetic polymer.
2 - Question
What are the linear chain polymers that get soften on increase in temperature?
a) Thermosetting
b) Thermoplastic
c) Crystalline
d) Amorphous
View Answer
Explanation: The thermoplastic polymers are linear chain polymers which are soluble in organic solvents and soften upon increase in temperature.
3 - Question
Which of the following is not a property of thermosetting polymer?
a) Highly crosslinked
b) Decompose on increase in temperature
c) Insoluble in organic solvents
d) Amorphous
View Answer
Explanation: Thermosetting polymers may or may not be amorphous. Hence it is not a property of a thermosetting polymer.
4 - Question
What is a glass transition temperature?
a) When a rubbery polymer turns into glass
b) When a glassy polymers turns into rubbery polymer
c) When the polymer becomes a melt
d) When the melting point is reached
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Explanation: When the temperature of a glassy polymer is reached a certain temperature known as glass transition temperature is achieved where the polymer turns rubbery.
5 - Question
The reaction product of cellulose and acetic anhydride is:
a) Acetic cellulose
b) Cellulose acetate
c) Cellulose diacetate
d) Cellulose triacetate
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Explanation: The reaction of product of cellulose and acetic anhydride is cellulose triacetate which is hydrophobic, highly crystalline and high quality.
6 - Question
To increase the strength of polyisoprene ,it is vulcanized with:
a) Rubber
b) Phosphorous
c) Sulphur
d) Sodium
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Explanation: Vulcanization is done with the help of sulphur, a process that introduces crosslinks
7 - Question
Which of the following is not a property of aromatic polyamides?
a) Low melting
b) Crystalline
c) High resistance to solvents
d) Long term thermal stability
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Explanation: Aromatic polyamides are high melting crystalline polymers.
8 - Question
Which of the following true about polycarbonates?
a) Amorphous
b) Not ductile
c) Fragile
d) Thermosetting
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Explanation: Polycarbonates which are characterized by –OCOO- chain are amorphous polymers.
9 - Question
Polysulphones contain the _______ group.
a) S
b) CO
c) SO2
d) SO4
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Explanation: Polysulphones can be easily made into fibres and all of them contain a SO2 group.
10 - Question
Which of the following is untrue about Polytetrafluoroethylene?
a) Branched chain
b) Highly crystalline
c) Exceptional thermal stability
d) High degree of polymerization
View Answer
Explanation: Polytetrafluoroethylene is a straight chain polymer and can be formed into films and tubing.