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प्रश्न
Beautiful hand crafted articles like boxes and toys are made of paper pulp in our country. Can you explain how paper pulp which is made from paper can be used to make hard boxes and other articles?
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उत्तर
Paper pulp can be used to make hard boxes and other items in the following ways:
- To begin, we can create a stencil by unfolding a small cardboard box and tracing it onto a piece of cardboard the same size as a mould. Cut the shape now.
- Place the stencil between mould and the deckle.
- To remove the pulp, raise the mould, stencil and deckle in one continuous action.
- Take the box off the stencil and set it aside to dry.
- Now, fold the box and tape it to assemble it.
- The box is ready.
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संबंधित प्रश्न
Why are some substances biodegradable and some non-biodegradable?
Write note.
Industrial waste
List some of the common wastes produced in mining operation and mention how these can be reused.
Match the items in Column I with as many times as possible in Column II.
|
Column I |
Column II |
|
1. Cow dung |
(i) Sugarcane |
|
2. Bagasse |
(ii) Raddiwalas |
|
3. Old newspapers |
(iii) Manure |
What is a landfill?
List the biodegradable and non-biodegradable waste products in your school What are the best ways to get rid of this garbage?
What do you do with the leftover food at home?
To what use can you put the following kind of garbage and how?
Rotting smelly garbage
Put a tick (√) against the garbage items given in Table 16.1 which could be converted into manure. Put a cross (×) against the others.
| Garbage Items | Make manure or not | |
| (i) | Egg shells | |
| (ii) | Straw | |
| (iii) | Dry flowers | |
| (iv) | Pebbles | |
| (v) | Broken pieces of glass | |
| (vi) | Nails and screws | |
| (vii) | Plastic bangles | |
| (viii) | Left over food | |
| (ix) | Steel broken vessel | |
| (x) | Dead animals |
Distinguish between the following pair:
Biodegradable and Non-biodegradable waste.
