Synthetic Fibres and Plastics - II
Synthetic Fibres and Plastics - II
Questions
Which of the following are synthetic fibres?
- Silk, nylon, rayon and polyester
- Flax, polyester and nylon
- Nylon, polyester and rayon
- Wool, flax and jute
Shilpa wants to buy a dress made of silk but she does not have enough pocket money to buy it as silk fibre is very costly. Which among the following fibres would you suggest to her, that has properties similar to silk and is cheaper than silk?
- Rayon
- Nylon
- Polyester
- Acrylic
Nisha has four dresses made up of different fabrics respectively: 'A' is made up of cotton, 'B' of silk, C of rayon and 'D' of polyester. Which dress should she wear during a journey so that it does not get wrinkled easily?
- Dress 'A'
- Dress 'B'
- Dress 'C'
- Dress 'D'
"Plastic articles are available in all possible shapes and sizes". Which among the following properties of plastics justifies the above statement?
- They can be recycled easily.
- They are easily mouldable.
- They can be reused.
- They can be rolled into sheets.
Which of the following statements is incorrect about plastics?
- They are used in cars and aircrafts as they are lighter than metals.
- They do not react with water and air when exposed to moisture.
- They are used to make electrical equipments as they conduct electricity.
- They are used to store chemicals as they are non-reactive.
It is advised not to burn plastic materials because
- they stick to the ground and do not burn completely
- they release poisonous fumes
- they vigorously react on heating and cause accidental burns
- they decompose quickly
Which among the following statements are correct?
- Plastic takes several years to decompose.
- Use of bags made of Jute should be reduced.
- Plastic bags should not be thrown on roads but should be dumped under the ground.
- Burning of synthetic material is quite slow.
- Only 1 and 3
- Only 1 and 4
- Only 2 and 3
- Only 3 and 4
Why is cotton said to be a polymer?
- Because it is renewable and biodegradable.
- Because it is made up of large number of glucose units.
- Because it is obtained from natural resources.
- Because it is used to make clothes.
A nylon thread is stronger than a steel wire. Based on the given inference, for what purpose is the nylon fibre best to use?
- Carry bags
- Ropes for rock climbing
- Clothes and carpets
- Films
Which of the following properties of cotton cloth makes it viable to wear during summers?
- Renewable
- Biodegradable
- Durable
- Good absorbent of moisture
Why is it advised not to wear synthetic clothes, while working in kitchen or in laboratory?
- Because they are non biodegradable.
- Because they get heated up easily.
- Because they cause suffocation and block skin pores.
- Because they melt on heating.
Why do people prefer synthetic fibres over natural fibres?
- Because they are renewable and biodegradable.
- Because they are comfortable for human skin.
- Because they are cheap and durable.
- Because they are non allergic.
Why are plastics used to cover electric wires and handles of screw drivers?
- Because they are non reactive.
- Because they are strong and durable.
- Because they are poor conductors of heat and electricity.
- Because they can be deformed easily.
Match the following fibres with their uses and choose the correct option from the following.
| 1. Nylon | (i) Wires |
| 2. Rayon | (ii) Parachutes |
| 3. PET | (iii) Shawls |
| 4. Acrylic | (iv) Fabric |
- 1 - (iv), 2 - (iii), 3 - (ii), 4 - (i)
- 1 - (ii), 2 - (iv), 3 - (i), 4 - (iii)
- 1 - (iii), 2 - (ii), 3 - (i), 4 - (iv)
- 1 - (i), 2 - (iii), 3 - (iv), 4 - (ii)
Match the following fibres with the sources form where they are prepared and choose the correct option from the following.
| (1) Rayon | (i) Coal, water and air |
| (2) Nylon | (ii) Chemical treatment of wood pulp |
| (3) Terylene | (iii) Petrochemical |
| (4) Acrylic | (iv) Esters |
- 1 - (ii), 2 - (i), 3 - (iv), 4 - (iii)
- 1 - (i), 2 - (ii), 3 - (iv), 4 - (iii)
- 1 - (i), 2 - (ii), 3 - (iii), 4 - (iv)
- 1 - (iv), 2 - (iii), 3 - (i), 4 - (ii)
Why is plastic considered a non-biodegradable substance?
- Because it is not obtained from natural resources.
- Because it releases lot of poisonous fumes on burning.
- Because it is not decomposed by natural processes.
- Because it is a poor conductor of heat and electricity.
Shekhar wants to make a plastic container that gets deformed easily on heating and can be bent easily. Which of the following materials would you suggest him to make such a container?
- Bakelite
- Melamine
- Teflon
- PVC
Match the following types of plastic with their applications.
| 1. PVC | (i) Carry bags |
| 2. Melamine | (ii) Toys |
| 3. Bakelite | (iii) Electrical switches |
| 4. Polythene | (iv) Floor tiles |
- 1 - (ii), 2 - (iv), 3 - (iii), 4 - (i)
- 1 - (iii), 2 - (ii), 3 - (iv), 4 - (i)
- 1 - (iv), 2 - (iii), 3 - (ii), 4 - (i)
- 1 - (iv), 2 - (ii), 3 - (iii), 4 - (i)
Match the following:
| 1. Bakelite | (i) Fire-resistant |
| 2. Melamine | (ii) Deformable |
| 3. Teflon | (iii) Poor conductor of electricity |
| 4. PVC | (iv) Non-stick |
- 1 – (i), 2 – (ii), 3 – (iii), 4 – (iv)
- 1 – (iii), 2 – (i), 3 – (iv), 4 – (ii)
- 1 – (ii), 2 – (i), 3 – (iii), 4 – (iv)
- 1 – (iv), 2 – (ii), 3 – (i), 4 – (iii)