How Things are Made
CBSE · Class 4 · EVS
Flashcards for How Things are Made — CBSE Class 4 EVS. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is the first step in making recycled paper?
Answer
Tear old newspapers into small pieces and soak them in water. Add fenugreek seeds (methi) to act as a binding material and leave overnight.
Why are fenugreek seeds (methi) added when making recycled paper?
Answer
Fenugreek seeds are used as a binding material to help hold the paper fibers together and make the paper stronger.
Name three natural ingredients that can be used to color paper and their colors.
Answer
1. Turmeric - Yellow color (dull) 2. Spinach - Green color 3. Beetroot - Red/Pink color 4. Henna - Orange/Brown color…
What materials did people use for writing before paper was invented?
Answer
People used cloth, leaves, wooden boards, and palm leaves called 'talapatra' in India for writing before paper was invented.
Why is tissue paper used for cleaning?
Answer
Tissue paper is used for cleaning because it is very thin, soft, and absorbs water easily.
Why is cardboard used for making boxes?
Answer
Cardboard is used for making boxes because it is thick and hard, which makes it strong enough to pack and protect various objects.
What is the Braille system and how does it help visually challenged people?
Answer
The Braille system helps visually challenged people read and write by feeling different patterns of tiny bumps on special Braille paper. These patterns represent different numbers, alphabets, and punc…
What are the 5 Rs of waste management?
Answer
The 5 Rs are: 1. Refuse - Say no to things that create waste 2. Reduce - Use things carefully to create less waste 3. Reuse - Use something many times 4. Repurpose - Use something in a new way 5. Recy…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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