Synthetic Fibres and Plastics Class 8 Quiz Question with Answer
Synthetic Fibres and Plastics Class 8 Quiz Question with Answer. CBSE Class 8 Science Lesson 3 Mock Test.
1) Synthetic fibres prepared from the raw material of petroleum origin are called_______.
a) Biochemical
b) Petrochemicals
c) Elastomer
d) None of these.
Solution: (B) Petrochemicals
Explanation: All the synthetic fibres are prepared using raw material of petroleum origin called as petrochemicals.
2) Which of the following pairs is incorrect?
a) P.E.T- polyester
b) PVC-thermoplastic.
c) Acrylic – natural wool
d) Teflon – cook wares.
Solution: (C) Acrylic – natural wool
Explanation: all the pairs are correct except option (c) Because Acrylic is artificial wool. Hence, it is an incorrect pair.
3) Which of the following statements is incorrect?
a) Plastic – is a biodegradable substance.
b) A nylon wire is stronger than steel wire.
c) Chain of glucose units is called polymer.
d) Bakelite is a poor conductor of electricity.
Solution: (A) Plastic – is a biodegradable substance
Explanation: Plastic is a non-biodegradable substance so option (A) is incorrect.
4) Which of the synthetic fibres is strongest?
a) Nylon
b) Steel wire
c) Acrylic
d) None of these
Solution: a) Nylon
Explanation: The strongest synthetic fibre is nylon it is more strong than steel wire and acrylic fibre, nylon is a chain of amid hence stronger than other two.
5) Chain of glucose unit is labelled as ______.
a) Monomer
b) Polymer
c) Cells
d) All of the above.
Solution: (B) Polymer
Explanation: Chain of glucose units called polymers so option (B) is the correct one.
6) Which of the following is an Example of Artificial wool?
a) Nylon
b) Rayon
c) Both of the above
d) polythene
Solution: (C) both of the above
Explanation: Both nylon and the rayon are manmade wool also called as artificial wool, while polythene is not fibre it is a plastic so both nylon and rayon are the example artificial wool.
7) The fiber made artificially by human beings is known as _______.
a) Natural fiber.
b) Synthetic fibers
c) Plant fibers
d) None of the above
Solution: (B) synthetic fibers
Explanation: The fibre made by human beings is known as synthetic fibres or manmade fibres while fibres obtained from plants and animals are called natural fibres.
8) Which of the following are the natural fibres?
a) Wool
b) Silk
c) Cotton
d) All of these.
Solution: (D) all of these
Explanation: All of these fibres are obtained from plants and animals are called natural fibres. So wool, silk and cotton are the natural fibres.
9) Fabric is made from ______.
a) Fibre
b) Fats
c) Carbohydrate
d) None of the above
Solution: (A) fibre
Explanation: fabric is made from fibre obtained from natural and artificial sources.
10) The word polymer comes from which of the following?
a) Latin word
b) Greek word
c) Italic word
d) French word
Solution: (B) greek word
Explanation: the word polymer comes from two words;
Poly – meaning many, and mer – in a single unit,Both poly and mer are Greek words.
11) Which of the following synthetic fibres is used to make curtains, toothbrushes and socks?
a) Nylon
b) Rayon
c) Polyester
d) All of the above
Solution: (A) nylon
Explanation: nylon fibre is used to make curtains, toothbrushes and socks because this fibre is strong, elastic and light.
12) Which of the following is the fully synthetic fibre?
a) Rayon
b) Polyester
c) Nylon
d) acrylic
Solution: (C) nylon
Explanation: nylon is fully synthetic fibre because it was made without using any natural raw material; it was prepared from coal, water and air, so it was the first fully synthetic fibre while rayon is obtained from natural sources.
13) PET stand for __________________
a) Polymer ethylene terephthalate
b) Polyethylene terephthalate
c) Polyester ethylene terephthalate
d) Poly Wool ethylene terephthalate
Solution: (A) polymer ethylene terepthalene
Explanation: PET stands for polyethylene terephthalate and is a very familiar form of polyester.
14) Which of the following are characteristics of synthetic fibres?
a) It is less expensive and readily available.
b) They dry up easily and are durable and affordable.
c) Easy to maintain.
d) All of the above
Solution: (D) all of the above
Explanation: All of these are the characteristics of synthetic fiber.
15) Which of the following plastic is used to prepare toys, comb and various type of container?
a) Polythene
b) PVC
c) Both (a) and (b).
d) Metamine.
Solution: (B) PVC
Explanation: Both polythene and PVC are used for the manufacturing of toys, comb and other types of container because polythene and PVC are the thermoplastic such plastic get deteriorate easily on heating and can be bent easily, so it is used for preparation of toy, comb and others.
16) Which of the following are example of thermoplastic?
a) Bakelite
b) Melamine
c) Both of the above
d) PVC
Solution: (D) PVC
Explanation: both melamine and Bakelite are the example of thermosetting plastic which only can be moulded once, can be softened while PVC is the example of thermoplastic. Hence, the answer (D).
17) Which of the following matter is a bad conductor of electricity?
a) Iron
b) Copper
c) Plastic
d) steel
Solution: (c) plastic
Explanation: Plastic has poor conductivity of the electricity, while iron, copper and steel are good conductor of heat and electricity.
18) Which of the following is a fire-proof plastic?
a) PVC
b) Polythene
c) Melamine
d) None of these.
Solution: (C) mealmine
Explanation: Melamine is a thermosetting plastic, it cannot be softened by heating and it resists fire. That is why the uniforms of firemen have a coating of melamine plastic to make them flame resistant.
19) Which of the following plastics is used to make non-stick cookware?
a) Melamine
b) Teflon
c) PVC
d) All of the above
Solution: (B) Teflon
Explanation: oil and water does not stick on Teflon (tetrafloride) plastic so it is used to make non-stick cookware.
20) Are plastic bags biodegradable?
a) Yes
b) No
c) Can’t say?
d) None of these.
Solution: b) No
Explanation: No, plastic bags are non- biodegradable material because it don’t get decompose in the soil.