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Man-made Materials · Maharashtra Board STD 8 (MSBSHSE - Semi English Medium). 5 questions.

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5 questions · self-marked practice — reveal the answer and mark yourself.

Question 13 Marks
Make list about use of thermocol in your daily life.
Answer
  1. Decorative items used at the time of festivals.
  2. Packing materials.
  3. Insulating boxes to keep food warm.
  4. Insulating boxes to keep fish in iced condition to prevent decomposition.
  5. Thermocol beads in the bean bags.
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Question 23 Marks
Classify and make a chart of the materials used in various items in house. Make additions to that chart with reference to various materials.
Name of item Material used
ManmadeNatural
Wooden chair Wood
CombPlastic
Answer
Name of the item Material used
Man-madeMan-made
Wooden chairPlasticWood
CombPlasticIvory, wooden
Pressure cookerAlloys, plastic handle and rubber ringMetals
Notebooks and booksBleaching agents, printing inkPaper obtained from trees
Purses and bagsPlastic, rubber, polyester, alloys for zips and buttonsLeather, cotton, silk
ClothesPolyester fabricCotton, silk, jute
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Question 33 Marks
Why most of domestically useful items are replaced by plastic?
Answer
Plastic is lighter and unbreakable. The handling thus becomes easier. It is non-corrosive, hence pickles, spices, etc. can be stored in plastic containers. It is cheaper as compared to the metal and glass articles. Thus, it becomes popular with general public. It is easier to wash and maintain the plastic articles. These are some of the reasons of making plastic a domestically useful material.
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Question 43 Marks
Why are the plastic tanks used for storage of chemicals?
Answer
Plastic is non-corrosive. It is comparatively non-reactive and it does not decompose. Moreover, the plastic containers are easier for handling. They are lighter and unbreakable. Hence the plastic tanks are used for storage of chemicals.
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Question 53 Marks
What are the qualities of thermocol?
Answer
  1. Thermocol is modern man-made material made from polystyrene.
  2. It can be transformed into liquid state when heated at more than 100 °C temperature. On cooling, it returns to the solid state.
  3. Therefore, any desired shape can be given to it.
  4. It acts as a good shock-absorber and hence used as a packing material to transport brittle material.
  5. It is a bad insulator of heat and hence used for storing fish and other perishable articles in market.
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