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WorksheetsSynthetic Fibers and Plastics_E_1
Total questions: 30
Worksheet time: 21mins
Synthetic fibres are also called _______ or _________ fibres.
artificial
man-made
natural
semi-processed
Synthetic fibres are synthesised from raw material called ____________.
petrochemicals
chemicals
plastic
iron
Like synthetic fibres, plastic is also a (a)
(a) is a popular polyester.
(a) is made of many repeating units.
Thermoplastics can bent easily.
TRUE
FALSE
Polymers are made up of many bigger units.
True
False
PET is a very familiar form of polyester.
True
False
Polyester fabrics do not get wrinkled easily.
True
False
Fabric obtained from silk fibre is very cheap.
True
False
Waterproof material/used for packing liquids
Polythene
Polythen
Wood
Fabric
Which of the following are naturally occurring polymers?
DNA
Proteins
Starch
Cellulose
Atul was climbing mountain and he wondered about the strength of rope in his hand which was stronger than a steel wire. This rope would have been made up of:
Polyester
Nylon
Rayon
Cotton
Which synthetic fiber is known as artificial silk?
(a)
Which is the first fully synthetic fibre?
(a)
Write disadvantages of synthetic fibre.
They trap the heat in our body.
They make us sweat profusely.
They contain chemicals that may harm our skin.
They are not very comfortable.
They catch fire easily
They melt easily and stick on to the wearer
Esters are the chemicals which give fruits their smell.
True
False
4 R principles mean
Reduce
Reuse
Recycle
Recover
What are the advantages of nylon?
Nylon fibre is strong
Nylon fibre is elastic and light
Nylon is lustrous and easy to wash.
Write uses of bakelite.
it can be used in manufacturing electrical switches and machine parts of electrical systems.
it is used formaking handles of various utensils, etc.
It was used for its non-conductive and heat-resistant properties in electrical insulators, and also in radios and telephones.
In the 1920s, Bakelite production of jewellery became popular. Bakelite is used for making toys
Write uses of melamine.
It is used for making floor tiles
Kitchenware
Microwave appliances
Electrical/Electronic Applications
Fabrics which resist fire
How is rayon different from synthetic fibres?
Rayon is different from synthetic fibres because it is obtained from a natural source, wood pulp.
Rayon is a natural material so it is different from synthetic fibers
Rayon can only be used for making clothes
Rayon does not melt on heating
Nylon fibres are very strong as it is used:
to make parachutes
ropes for rock climbing
reinforcement in rubber material like car tires
for many injection molded parts for vehicles and mechanical equipment.
Polythene (Poly + ethene) is a type of plastic that is used for making commonly used polythene bags
True
False
Plastic bag is non-biodegradable because it takes several years to degenerate
True
False
Pickles contain vinegar which has acetic acids. While jam contains tartaric acids. As a result if you store them in metal containers, a chemical reaction will happen making the jam and pickles toxic. Hence, plastic containers are the best option to store jams and pickles. Plastic jars also has the ability to preserve food for longer periods of time.
True
False
ll plastics do not have the same type of arrangement of units. In some it is linear, whereas in others it is cross-linked.
True
False
Nylon is called fully synthetic fibre because it is prepared from:
coal
water
air
wood pulp
Polyester (Poly+ester) is actually made up of the repeating units of a chemical called an (a) .
(a) is used as a substitute of natural wool for knitting sweaters, shawls, blankets etc
