8th Grade > Chemistry
SYNTHETIC FIBRES AND PLASTICS MCQs
Total Questions : 35
| Page 4 of 4 pages
Answer: Option C. ->
Nylon
:
C
Nylon threads are strong, elastic and lightweight. A nylon wire is stronger than a steel wire having the same diameter. Hence, it is preferred for making parachutes.
Harness straps, tents, sleeping bags, sails, ropes, fishing poles, etc are also made from nylon fibers because of its strength.
:
C
Nylon threads are strong, elastic and lightweight. A nylon wire is stronger than a steel wire having the same diameter. Hence, it is preferred for making parachutes.
Harness straps, tents, sleeping bags, sails, ropes, fishing poles, etc are also made from nylon fibers because of its strength.
Answer: Option C. ->
Polyester
:
C and D
A sports garment needs to be light in weight, non-absorbent of sweat, easier and faster to dry, etc. Cotton absorbs moisture but does not dry easily. Clothes made of synthetic fibres like polyesters and nylon do not absorb moisture. Instead they help in quickly transporting the sweat from the skin to the outer surface, from where it dries off easily.
:
C and D
A sports garment needs to be light in weight, non-absorbent of sweat, easier and faster to dry, etc. Cotton absorbs moisture but does not dry easily. Clothes made of synthetic fibres like polyesters and nylon do not absorb moisture. Instead they help in quickly transporting the sweat from the skin to the outer surface, from where it dries off easily.
Answer: Option B. ->
False
:
B
:
B
- Plastic is very light, strong and durable. In addition to these, it can also be moulded into different shapes and sizes.
- So, it is used for various purposes in industries and for the manufacture of household products.
- Since plastic is cheaper, lighter and chemically unreactive as compared to metals, it is used in cars, aircrafts and spacecrafts.
Answer: Option B. ->
Teflon
:
B
:
B
A non-stick surface can reduce the ability of other materials to stick on it. These surfaces are coated with a synthetic polymer called teflon. Non-stick cookware and the flat end of an electric iron are coated with teflon.
Answer: Option B. ->
False
:
B
Thermosetting plastics are those plastics which once moulded cannot be remoulded by heating. They are strong, durable and resists heat to a large extent. The well known examples are bakelite and melamine.
On the other hand, thermoplastics can be repeatedly moulded if they are heated above a specific temperature. For example, PVC, nylon, etc.
:
B
Thermosetting plastics are those plastics which once moulded cannot be remoulded by heating. They are strong, durable and resists heat to a large extent. The well known examples are bakelite and melamine.
On the other hand, thermoplastics can be repeatedly moulded if they are heated above a specific temperature. For example, PVC, nylon, etc.
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