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CBSE Questions for Class 8 Chemistry Synthetic Fibres And Plastics Quiz 10 - MCQExams.com
CBSE
Class 8 Chemistry
Synthetic Fibres And Plastics
Quiz 10
Acrylic, a man made fibre is a good substitute of a natural fibre. Which is this natural fibre?
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Wool
0%
Silk
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Cotton
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Jute
Explanation
Acrylic is a man-made fibre. It is also called artificial or synthetic wool as it resembles natural wool. But, it is cheaper than natural wool.
The thermosetting plastic among these is:
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PVC
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bakelite
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teflon
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nylon
Explanation
From the given options, bakelite is a thermosetting plastic. PVC is a thermoplastic. Teflon is also a thermoplastic. Nylon is a synthetic fibre used to make curtains, clothes, socks, ropes, etc.
The most suitable material for the preparation of handles of cooking utensils is
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Polythene
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PVC
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Nylon
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Bakelite
Explanation
Bakelite is the most suitable object to prepare handles of cooking utensils. Bakelite is a bad conductor that is why it is more suitable.
Thus, correct answer is option D.
The example of natural fibre is:
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rayon
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nylon
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cotton
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dacron
Explanation
Among the given options, rayon, nylon and Dacryon are are synthetic polymers. i.e., man-made whereas cotton is the natural fiber that we get from cultivation.
$$\therefore$$ The correct answer is $$C$$.
If the plastics are hard, become soft and readily workable by the addition of certain compounds called:
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Catalysts
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Telomers
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Plasticisers
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Vulcaniser
Explanation
A catalyst is a substance that can be added to a reaction to increasing the reaction rate without getting consumed in the process.
A telomere is a region of repetitive nucleotide sequences at each end of a chromosome.
Plasticizers are used to convert PVC, a rigid plastic, into a soft, flexible, and elastic material.
Vulcaniser is someone who vulcanizes rubber to improve its strength
So, if the plastics are hard, become soft and readily workable by the addition of certain compounds called plasticizers.
Hence, option $$C$$ is correct.
Which of the following polymers are thermoplastic?
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Teflon
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Natural rubber
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Neoprene
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Polystyrene
Explanation
Thermoplastic polymers: There are the linear or slightly branched long-chain molecules capable of repeatedly softening on heating and hardening on cooling. These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres. Some common thermoplastic is polythene, polystyrene, polyvinyl, etc.
Which of the following is non-biodegradable?
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Cotton
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Wool
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Nylon
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Paper
Explanation
Here cotton and wool are natural fibers and are biodegradable. Paper is also obtained from plants and it is also biodegradable.
Nylon is synthetic fibers that are elastic and durable. They are strong, smooth, and cheaper in price but they are non-biodegradable which means they can not be broken down by living organisms.
Hence, option $$C$$ is correct.
A synthetic fibre obtained from petroleum is
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Bakelite
0%
Rayon
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Melamine
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Polyester
Explanation
Polyester fibres which are strong and absorb very little water are formed from petroleum products. So option D is correct.
PET is a______.
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polyamide
0%
polyester
0%
nylon
0%
rayon
Explanation
PET, which stands for polyethylene terephthalate, is a form of polyester. It is extruded or molded into plastic bottles and containers for packaging foods and beverages, personal care products, and many other consumer products.
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