8th Grade > Chemistry
SYNTHETIC FIBRES AND PLASTICS MCQs
Total Questions : 35
| Page 2 of 4 pages
Answer: Option A. -> Polyester, nylon
:
A
Fibres that are obtained from chemical substances are called as man-made fibres or synthetic fibres. For example, nylon, polyester, etc.
However, silk and jute are natural fibres.
:
A
Fibres that are obtained from chemical substances are called as man-made fibres or synthetic fibres. For example, nylon, polyester, etc.
However, silk and jute are natural fibres.
Answer: Option B. -> Bakelite
:
B
Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Two examples are:
1)Bakelite: Used for making electrical switches, handles of various utensils.
2)Melamine: Used for making floor tiles, kitchenware and fabrics which can resist heat.
:
B
Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Two examples are:
1)Bakelite: Used for making electrical switches, handles of various utensils.
2)Melamine: Used for making floor tiles, kitchenware and fabrics which can resist heat.
Answer: Option B. -> rayon
:
B
Rayon was developed as analternative for silk. It is prepared by the chemical processing of wood pulp or cellulose.It resembles the texture and lookof natural silk and can be woven like silk fibres. Hence, it is also called artificial silk.
:
B
Rayon was developed as analternative for silk. It is prepared by the chemical processing of wood pulp or cellulose.It resembles the texture and lookof natural silk and can be woven like silk fibres. Hence, it is also called artificial silk.
Answer: Option B. -> False
:
B
Many of the sweaters andshawls are made ofsynthetic fibre called acrylic. Acrylic is a synthetic fibre which resembles wool. However, acrylic sweaters are not as good insulators as woolen sweaters. Hence, acrylic seaters are unsuitable for very cold temperatures.
:
B
Many of the sweaters andshawls are made ofsynthetic fibre called acrylic. Acrylic is a synthetic fibre which resembles wool. However, acrylic sweaters are not as good insulators as woolen sweaters. Hence, acrylic seaters are unsuitable for very cold temperatures.
Answer: Option D. -> Melamine
:
D
Melamine is a versatile material which resists the spread of fire. It can tolerate heat better than other plastics. It is used in the firefighters' uniformsfor the protection of theirbody from heat hazards.It is also used for making floor tiles, kitchenware, in aeroplanes and busesto prevent the spread of fire.
:
D
Melamine is a versatile material which resists the spread of fire. It can tolerate heat better than other plastics. It is used in the firefighters' uniformsfor the protection of theirbody from heat hazards.It is also used for making floor tiles, kitchenware, in aeroplanes and busesto prevent the spread of fire.
Answer: Option A. ->
Nylon
:
A and C
∙ Fibres are obtained either from natural or artificial sources.
∙ Nylon and polyester are synthetic fibres obtained from chemical sources like petrochemicals.
∙ Jute and cotton are natural fibres obtained from jute and cotton plants respectively.
:
A and C
∙ Fibres are obtained either from natural or artificial sources.
∙ Nylon and polyester are synthetic fibres obtained from chemical sources like petrochemicals.
∙ Jute and cotton are natural fibres obtained from jute and cotton plants respectively.
Answer: Option B. ->
Acrylic
:
B and D
Fabrics made from polyester or acrylic are widely used in pants, shirts, suits and bedsheets either by itself or as a blend. This is because of their wrinkle resistant and shape retention properties.
:
B and D
Fabrics made from polyester or acrylic are widely used in pants, shirts, suits and bedsheets either by itself or as a blend. This is because of their wrinkle resistant and shape retention properties.
Answer: Option A. ->
Non-reactive, non-conductive.
:
A and C
:
A and C
Plastics are light, strong and durable. They are also non-reactive towards chemicals. They are poor conductors of heat and electricity, cheap and easy to handle. Because of all these properties, plastics are used in making a wide variety of products.
Answer: Option B. ->
False
:
B
:
B
Many of the sweaters and shawls are made of synthetic fibre called acrylic. Acrylic is a synthetic fibre which resembles wool. However, acrylic sweaters are not as good insulators as woolen sweaters. Hence, acrylic seaters are unsuitable for very cold temperatures.
Answer: Option B. ->
rayon
:
B
Rayon was developed as an alternative for silk. It is prepared by the chemical processing of wood pulp or cellulose. It resembles the texture and look of natural silk and can be woven like silk fibres. Hence, it is also called artificial silk.
:
B
Rayon was developed as an alternative for silk. It is prepared by the chemical processing of wood pulp or cellulose. It resembles the texture and look of natural silk and can be woven like silk fibres. Hence, it is also called artificial silk.
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