Fibres and Plastics Test

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Fibres and Plastics Test - 1

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Weekly Quiz Competition

Question 1
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Which of the following statements is/are correct?

(a) Nylon thread is stronger than steel wire.
(b) Rayon is obtained from wood pulp.
(c) Nylon is used to make bristles of tooth brushes.

A
Only (a)

B
Only (b)

C
Only (c)

D
(a), (b) and (c)

Solution

Nylon is known to have a greater tensile strength than a steel wire.
Rayon is obtained by the synthetic treatment of wood pulp.
Bristles of tooth brushes are made of nylon.
Hence, all the statements are correct.
Question 2
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Synthetic fibres are made using ______ as raw materials.

A
woollen products

B
polymers

C
cotton

D
petrochemicals

Solution

A synthetic fibre is a chain of small units joined together. Each small unit is actually a chemical substance. Many such small units combine to form a large single unit called a polymer.
Question 3
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You must not wear synthetic fibres while working with fire because ____________.

A
they make you feel cold and so you may get a frostbite

B
they are lustrous and so they shine under the flame

C
they melt on heating and stick to your body when they catch fire

D
None of the above

Solution

Synthetic fibres have lower melting point, so they melt easily on heating and stick to our body.
Question 4
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Which of the following statements is incorrect?

A
Catenation is a unique property of carbon.

B
Plastics that get deformed easily are called thermoplastics.

C
Plastics are long chain molecules containing repeating units.

D
Nylon is made from coal, water and carbon.

Solution

Nylon is formed when appropriate monomers like adipic acid and hexamethylene diamine combine through peptide bonds.
Question 5
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Which of the following is a popular polyester?

A
Terylene

B
Nylon

C
Teflon

D
Polythene

Solution

Terylene is a popular polyester. It can be drawn into very fine fibres that can be woven like any other yarn.
Question 6
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Which of the following elements is NOT a constituent of nylon?

A
Carbon

B
Chlorine

C
Oxygen

D
Nitrogen

Solution

The nylon is a polyamide and has carbon, hydrogen, oxygen, and nitrogen as its constituent elements.
The chlorine is not a constituent of nylon.
Question 7
1 / -0

What type of bonds are involved in the formation of nylon?

A
Peptide bonds

B
Hydrogen bonds

C
Covalent bonds

D
Ionic bonds

Solution

Nylon is formed when appropriate monomers such as adipic acid and hexamethylene diamine combine through peptide bonds.
Question 8
1 / -0

Which of the following is NOT a property of thermoplastics?

A
Weak van der Waals' forces

B
Deformation upon heating

C
Low molecular weights

D
Resistance towards creep

Solution

Thermoplastics are the polymers formed by linking of smaller units to form long chains and have high molecular weights.
Question 9
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Which of the following is not an example of thermosetting plastics?

A
Vulcanised rubber

B
Melamine

C
Bakelite

D
Polystyrene

Solution

Polystyrene is a thermoplastic.
Question 10
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Which of the following statements is incorrect about plastics?

A
Plastics are costlier than metals.

B
Plastics are lightweight.

C
Plastics are highly durable.

D
Plastics do not get corroded easily.

Solution

Plastics are lightweight and are highly durable.
Also, they don't get corroded easily.
Plastics are cheaper than metals.
So, the statement "Plastics are costlier than metals" is incorrect.
Question 11
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Pure nylon is not used in the making of

A
curtains

B
socks

C
toothbrushes

D
carpets

Solution

Pure nylon is not used in the making of carpets because the properties of nylon are such that friction (i.e. walking across the carpet) causes the fibres to build up a static charge. In order to get around this problem, most manufacturers treat their nylon carpets with an anti-static chemical which prevents the static charge from accumulating.
Question 12
1 / -0

Which of the following is not a type of nylon?

A
Nylon 6,6

B
Nylon 6

C
Nylon 6,12

D
Nylon 6,8

Solution

The types of nylon are nylon 6,6; nylon 6; nylon 6,9; nylon 6,10; nylon 6,12; nylon 11; nylon 12 and nylon 4,6. Nylon 6,8 is not a type of nylon.
The monomer of nylon 6 is:
The monomer of nylon 6,6 is:
The monomer of nylon 6,12 is:
Question 13
1 / -0

Which of the following fibres is regenerated fibre?

A
Rayon

B
Teflon

C
Acrylic

D
Nylon

Solution

In the production of rayon, purified cellulose is chemically converted into a soluble compound. A solution of this compound is passed through the spinneret to form soft filaments that are then converted or "regenerated" into almost pure cellulose. Because of the reconversion of the soluble compound to cellulose, rayon is referred to as a regenerated cellulose fibre.
Question 14
1 / -0

Which of the following statements are true?
(a) Synthetic fibres are very durable.
(b) Synthetic fibres are not attacked by insects or pests.
(c) Synthetic fibres are environment friendly.
(d) Plastics which, once moulded, can be softened by heating are called thermosetting plastics.

A
a, b and c

B
a, b, c and d

C
b, c and d

D
a and b

Solution

Synthetic fibres are very durable and are not attacked by insects or pests.
Question 15
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Which of the following fibres resembles wool?

A
Terylene

B
Acrylic

C
Polyester

D
Nylon

Solution

Acrylic resembles wool as both have the same texture.

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Re-Attempt Weekly Quiz Competition

Fibres and Plastics Test - 1

Result

Fibres and Plastics Test - 1

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SHARING IS CARING

Question 1

Only (a)

Only (b)

Only (c)

(a), (b) and (c)

Solution

Question 2

woollen products

polymers

cotton

petrochemicals

Solution

Question 3

they make you feel cold and so you may get a frostbite

they are lustrous and so they shine under the flame

they melt on heating and stick to your body when they catch fire

None of the above

Solution

Question 4

Catenation is a unique property of carbon.

Plastics that get deformed easily are called thermoplastics.

Plastics are long chain molecules containing repeating units.

Nylon is made from coal, water and carbon.

Solution

Question 5

Terylene

Nylon

Teflon

Polythene

Solution

Question 6

Carbon

Chlorine

Oxygen

Nitrogen

Solution

Question 7

Peptide bonds

Hydrogen bonds

Covalent bonds

Ionic bonds

Solution

Question 8

Weak van der Waals' forces

Deformation upon heating

Low molecular weights

Resistance towards creep

Solution

Question 9

Vulcanised rubber

Melamine

Bakelite

Polystyrene

Solution

Question 10

Plastics are costlier than metals.

Plastics are lightweight.

Plastics are highly durable.

Plastics do not get corroded easily.

Solution

Question 11

curtains

socks

toothbrushes

carpets

Solution

Question 12

Nylon 6,6

Nylon 6

Nylon 6,12

Nylon 6,8

Solution