8th Class Science Synthetic Fibers and Plastics Question Bank

done Synthetic Fibres and Plastics

• question_answer1) Which of the following statements is/are correct?

  (I) Most synthetic fibres are obtained from coal, petroleum and natural gas.

  (II) Acrylic fibres closely resemble wool.

  (Ill) Most synthetic fibres have very high moisture absorbing capacity.

  (IV) Polyester is prepared from cellulose.

  A) I and II only done clear

  B) II and III only done clear

  C) IV only done clear

  D) All of these done clear

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• question_answer2) Pre-weighed pieces of cloth of nylon, cotton, silk and wool of equal measurements are taken and soaked in a beaker filled with water. After a few minutes, the cloth pieces were taken out of the beaker and weighed again. Which of the following options places them in the correct order of their final weights?

  A) Wool > Silk > Nylon > Cotton done clear

  B) Cotton > Silk > Nylon > Wool done clear

  C) Silk > Wool > Cotton > Nylon done clear

  D) Wool > Cotton > Silk > Nylon done clear

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• question_answer3) Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather?

  A) Synthetic fibres catch fire very easily. done clear

  B) Synthetic fibres do not absorb sweat. done clear

  C) Synthetic fibres stick to the body. done clear

  D) Both (b) and (c). done clear

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• question_answer4) A brief information about three different plastics is given below :

  X : Thermoplastic which can be rolled into sheets

  V : Thermoplastic which is used as a covering for electric wires.

  Z : Thermosetting which is used for making plugs and switches. Identify X, Y and Z,

  A)

  X	Y	Z
  Melamine	Teflon	Bakelite

  done clear

  B)

  X	Y	Z
  Bakelite	Malamine	Polythene

  done clear

  C)

  X	Y	Z
  Polythene	Polyvinyl chloride	Bakelite

  done clear

  D)

  X	Y	Z
  Polyvinyl chloride	Polythene	Melamine

  done clear
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• question_answer5) Which of the following statements about plastics are true?

  (i) All plastics do not have same arrangement of monomer units.

  (ii) Melamine resists fire and can tolerate heat better than other plastics.

  (iii) Plastics with cross-linked monomers are also known.

  (iv) Plastics have limited applications.

  A) (i) and (iii) only done clear

  B) (iii) and (iv) only done clear

  C) (i), (ii) and (iii) only done clear

  D) (i), (iii) and (iv) only done clear

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• question_answer6) Match column I with column II and select the correct answer from the codes given below.

  Column I		Column II
  P.	A synthetic fibre also called as artificial silk	(i)	Spandex
  Q.	A synthetic fibre also known as lycra	(ii)	Acrylic
  R.	A synthetic fibre that closely resembles wool	(iii)	Rayon
  S.	The first true synthetic fibre	(iv)	Nylon

  A) P - (iv), Q - (ii), R - (iii), S - (i) done clear

  B) P - (iii), Q - (i), R - (ii), S - (iv) done clear

  C) P - (ii), Q - (iii), R - (i), S - (iv) done clear

  D) P - (iii), Q - (ii), R - (iv), S - (i) done clear

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• question_answer7) Which of the following materials is the best for making garments and jackets that can be used in wet or damp environment?

  A) Polyester done clear

  B) Wool done clear

  C) Cotton done clear

  D) None of these done clear

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• question_answer8) Match column I with column II and mark the correct option from the codes given below.

  Column I	Column II
  Polyester	(i) Prepared by using wood pulp
  Teflon	(ii) Used for making para chute and stockings
  Rayon	(iii) Used for making non-stick cook wares
  Nylon	(iv) Fabrics do not wrinkle easily

  A) - (iii), - (iv), - (i), - (ii) done clear

  B) - (iv), - (iii), - (i), - (ii) done clear

  C) - (iv), - (iii), - (ii), - (i) done clear

  D) - (i), - (ii), - (iii), - (iv) done clear

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• question_answer9) Choose the correct option for the given statements.

  I. Plastics are generally good conductors of electricity.

  II. Ropes made by bake lite are used in cranes and elevators.

  III. Teflon is a special plastic on which oil and water do not stick.

  IV. Plastic is non-biodegradable, hence not environment friendly.

  A)

  (i)	(ii)	(iii)	(iv)
  T	T	F	F

    done clear

  B)

  (i)	(ii)	(iii)	(iv)
  F	F	T	T

    done clear

  C)

  (i)	(ii)	(iii)	(iv)
  T	F	T	F

    done clear

  D)

  (i)	(ii)	(iii)	(iv)
  F	T	F	T

    done clear
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• question_answer10) Read the given statements and mark the appropriate answer.

  Statement 1: Polyester is synthesised from petrochemicals by linking ester units.

  Statement 2: Polyester is a natural fibre.

  A) Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1. done clear

  B) Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1. done clear

  C) Statement 1 is true and statement 2 is false. done clear

  D) Both statements 1 and 2 are false. done clear

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• question_answer11) Which of the following is not a characteristic of plastics?

  A) Plastics are poor conductors of heat. done clear

  B) Plastics are insoluble in water. done clear

  C) Plastics are non-inflammable. done clear

  D) Plastics do not react with water and air. done clear

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• question_answer12) See the figure given below and select the correct statements regarding polymers.

  1. Figure (X) shows structure of a monomer while figure (Y) shows structure of a polymer.

  2. Small boxes in the structure represent monomers which are joined to give a polymer.

  3. Figure (X) shows structure of a linear polymer while (Y) shows structure of a cross-linked polymer.

  A) 1 and 2 only done clear

  B) 1 and 3 only done clear

  C) 2 and 3 only done clear

  D) All are correct. done clear

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• question_answer13)

  Fill in the blanks by picking up the correct words.

  Fibres are materials which are usually thin and have thread-like structure. They are generally classified as ___P___ and ___Q___, on the basis of their origin. Natural fibres may be plant fibres like ___R___ or animal fibres like ___S___.

   

  A)

  P	Q	R	S
  Monomers	Polymers	Silk	Jute

                  done clear

  B)         

  P	Q	R	S
  Natural	Synthetic	Cotton	Silk

                  done clear

  C)

  P	Q	R	S
  Polymers	Natural	Wool	Jute

                  done clear

  D)

  P	Q	R	S
  Natural	Monomers	Jute	Wool

  done clear
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• question_answer14) Sneha has classified a few materials as shown in the table.

  S. No.	Material	Type/Nature
  1.	Nylon	Synthetic and non-biodegradable
  2.	Jute	Natural and non-biodegradable
  3.	Coir	Synthetic and biodegradable
  4.	Wool	Natural and biodegradable
  5.	Acrylic	Blended and biodegradable
  6.	Polyester	Synthetic and non-biodegradable

  The materials which are classified incorrectly are

  A) 1, 3 and 4 only done clear

  B) 2, 4 and 5 only done clear

  C) 2, 3 and 5 only done clear

  D) 1, 3 and 6 only. done clear

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• question_answer15) Anisha prepared a flowchart to show classification of fibres and plastics. She left few columns blank. Fill in the blanks by choosing the option with correct words.

  A)

  P	Q	R	S
  Plant fibres	Animal fibres	Thermoplastics	Thermosetting

  done clear

  B)

  P	Q	R	S
  Animal fibres	Plant fibres	Thermosetting	Thermoplastics

  done clear

  C)

  P	Q	R	S
  Rayon	Animal fibres	Biodegradable	Non-biode-gradable

  done clear

  D)

  P	Q	R	S
  Animal fibres	Plant fibres	Non-biodegradable	Biodegradable

  done clear
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• question_answer16) A few polymers are grouped together on the basis of some common property as follows:

  Group I: Rayon, acrylic, nylon, jute

  Group II: PVC, melamine, teflon

  Group III: Polycot, terrywool, acrylic Choose the odd one out in group I, II and III.

   

  A)

  I	II	III
  Rayon	Teflon	Terrywool

    done clear

  B)

  I	II	III
  Nylon	Teflon	Acrylic

    done clear

  C)

  I	II	III
  Jute	Melamine	Terrywool

    done clear

  D)

  I	II	III
  Jute	Melamine	Acrylic

    done clear
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• question_answer17) Which of the following applications of plastics show(s) that plastics are bad conductors of electricity?

  I. Refrigerators have an insulating wool of plastics.

  II. Electric wires have a plastic coating.

  III. Chemicals are stored in plastic containers.

  IV. Parachutes are made from plastics.

  A) II, III and IV only done clear

  B) III and IV only done clear

  C) I only done clear

  D) II only done clear

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• question_answer18)

  Read the given passage and fill in the blanks by choosing an appropriate option.

  Cellulose is a naturally occurring fibre. The walls of ___i___ are made of cellulose. It is used in making a synthetic fibre ___ii___ which resembles the most expensive natural fibre ___iii___ in appearance hence, it is also called ___iv___ .

   

  A)

  (i)	(ii)	(iii)	(iv)
  Animal cell	Cotton	Nylon	Animal fibre

  done clear

  B)

  (i)	(ii)	(iii)	(iv)
  Plant cell	Rayon	Silk	Artificial silk

  done clear

  C)

  (i)	(ii)	(iii)	(iv)
  Plant cell	Acrylic	Wool	Artificial wool

  done clear

  D)

  (i)	(ii)	(iii)	(iv)
  Animal cell	Silk	Rayon	Synthetic wool

  done clear
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• question_answer19) Read the following statements carefully.

  P. I am extensively used in the healthcare industry but my one disadvantage is that I am non-biodegradable.

  Q. I am very familiar form of polyester and used for making bottles, utensils, films, wires, etc.

  R. I am artificial silk and mixed with wool to make carpets. P, Q and R are respectively

   

  A) PET, Rayon and Plastic done clear

  B) Rayon, Plastic and PET done clear

  C) Plastic, Rayon and PET done clear

  D) Plastic, PET and Rayon. done clear

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• question_answer20) Match column I with column II and choose the correct option from the codes given below.

  Column I	Column II
  P. Nylon	(i) Burns quickly with a smell of burning paper
  Q. Wool	(ii) Burns with sooty flame, fabric shrinks and black beads are formed
  R. Acrylic	(iii) Shrinks after exposure to flame, forms hard beads and gives a smell of burning hair
  S. Rayon	(iv) Burns slowly with a smell of burning hair

  A) P - (i), Q - (iv), R - (ii), S - (iii) done clear

  B) P - (iii), Q - (iv), R - (ii), S - (i) done clear

  C) P - (iv), Q - (iii), R - (i), S - (ii) done clear

  D) P - (ii), Q - (iv), R - (iii), S - (i) done clear

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