Polymers Test

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Polymers Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

The contraction of the rubber-band is a spontaneous, natural process because it is accompanied by:

A
an increase in the kinetic energy

B
a decrease in the free-energy in the rubber-band

C
an increase in heat in the rubber-band

D
an elastic force

Solution

Any process with $$\Delta G=-Ve$$ will be spontaneous as contraction of rubber band is spontaneous so there will be decrease in the free energy in rubber band.
Question 2
1 / -0

'Buna-N rubber' is a coploymer of butadiene and acrylonitrile. In comparison to natural rubber it:

A
is delicate and soft

B
has better resistance to wear and tear

C
is a poor substitute for natural rubber

D
does not last for a long time

Solution

Synthetic rubber is more resistant to acids, oils, heat, aging and has more strength than natural rubber.
Question 3
1 / -0

Polymers are often gigantic molecules consisting of long chains of repeating chemical-units. Which of the following is not a polymer?

A
Rubber

B
Cellulose

C
Protein

D
Glucose

Solution

it is a monosaccharide, therefore, a glucose molecule is a monomer but it can form a polymer (starch or glycogen) when a large number of glucose molecules (units) joined together by glycosidic bonds.
Question 4
1 / -0

Teflon (tetrafluoroethylene) is a black material used in non-stick pans for frying chips and vegetables. The oil or butter does not stick at all. In the process of manufacture, one of the technical problems is:

A
to make teflon stick to the metal of the pan

B
to make teflon that is non-sticky

C
to make teflon

D
to cut a round sheet of teflon that exactly fits

Solution

Teflon even when melted do not flow instead it behaves as a gel due to absence of crystalline phase and high melting point so manufactures finds a bit difficulty to make teflon stick to metal of pan.
Question 5
1 / -0

Teflon, a polymer of tetrafluoroethylene, is an excellent plastic material for films and coatings. Which of the following is not the property of Teflon?

A
It is unaltered by radiation

B
It can withstand high temperatures

C
It is one of the most chemically-resistant plastic in the world

D
It is an ideal insulator for high-frequency fittings

Solution

$$PTFE$$ (Poly tetra fluoro ethylene) is very sensitive and is therefore not suitable for applications involving exposure of any radiation as it will degrade.
Question 6
1 / -0

Which of the following is not a synthetic rubber?

A
Neoprene

B
Buna-N rubber

C
Buna-S rubber

D
Polyethylene

Solution

$$ \begin{array}{l} \text { Neoprene, Buna- } N \text { and Buna-S are produced by different } \\ \text { chemical polymerization processes using catalysis. } \\ \text { While polyethylene is a synthetic polymer but not a rubber. } \end{array} $$
Question 7
1 / -0

Neoprene is a polymer made by using acetylene as a raw material. It is used as:

A
rubber in diving suits

B
plastic for car panels

C
plastic for dining tables

D
material for electrical switches

Solution

Neoprene is made of chloroprene. It is used as rubber as it is non-breakable and has good buoyancy.
Question 8
1 / -0

Vinylite resins are copolymers of vinyl acetate and vinyl chloride. They are resistant to wear and tear to chemicals. One of their well-known uses is in:

A
floor coverings

B
ropes

C
tyres

D
electrical insulators

Solution

$$\text{Vinylite resins are well known used in Floor coverings so that to resist chemicals from it.}$$
Question 9
1 / -0

Non-stick frying pans are coated black with Teflon, a material that is resistant to heat. Teflon is a polymer of:

A
fluoromethane

B
styrene

C
ethylene

D
tetrafluoroethylene

Solution

Teflon is a polymer of tetrafluoroethylene $$\left({C}_{2}{F}_{4} \right)$$, also known as polytetrafluoroethylene. It is a manmade polymer that has particular applications in manufactured products because of the chemical properties of Polytetrafluoroethylene.
Question 10
1 / -0

Plywood sheets are stuck together by unpolymerized:

A
nylon

B
carbon black

C
urea-formaldehyde resins

D
styrene and butadiene

Solution

$$ \begin{array}{l} \text { Plywood sheets are stuck together by unpolymerized } \\ \text { urea- formaldehyde resins. } \\ \text { It involves the extensive use for bonding of sheets of } \\ \text { plywood, paper, clothes etc. } \end{array} $$

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Re-Attempt Weekly Quiz Competition

Polymers Test - 40

Result

Polymers Test - 40

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SHARING IS CARING

Question 1

an increase in the kinetic energy

a decrease in the free-energy in the rubber-band

an increase in heat in the rubber-band

an elastic force

Solution

Question 2

is delicate and soft

has better resistance to wear and tear

is a poor substitute for natural rubber

does not last for a long time

Solution

Question 3

Rubber

Cellulose

Protein

Glucose

Solution

Question 4

to make teflon stick to the metal of the pan

to make teflon that is non-sticky

to make teflon

to cut a round sheet of teflon that exactly fits

Solution

Question 5

It is unaltered by radiation

It can withstand high temperatures

It is one of the most chemically-resistant plastic in the world

It is an ideal insulator for high-frequency fittings

Solution

Question 6

Neoprene

Buna-N rubber

Buna-S rubber

Polyethylene

Solution

Question 7

rubber in diving suits

plastic for car panels

plastic for dining tables

material for electrical switches

Solution

Question 8

floor coverings

ropes

tyres

electrical insulators

Solution

Question 9

fluoromethane

styrene

ethylene

tetrafluoroethylene

Solution

Question 10

nylon

carbon black

urea-formaldehyde resins

styrene and butadiene

Solution

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