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Science Distinguish Between.

Man-made Materials · Maharashtra Board STD 8 (MSBSHSE - Semi English Medium). 3 questions.

Questions

Distinguish Between.

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

Question 13 Marks
Degradable and Non-degradable substances:
Answer
Degradable substancesNon-degradable substances
1. The substances which can be naturally reduced into their inorganic constituents are called degradable substances.1. The substances that cannot be degraded on their own into their inorganic constituents are called non-degradable substances.
2. Degradable substances are not accumulated in the nature.2. Non-degradable substances remain accumulated in the nature for a long time.
3. Degradable substances emit foul odour when they are being decomposed.3. Non-degradable substances may not emit foul odour as they are not degraded. But they make the place look dirty.
4. Usually microorganisms play a part in the degradation process, hence such substances are also called biodegradable.E.g. Vegetables, fruits, wood, cotton or wool fibres, etc.4. Microorganisms cannot act on non-degradable substances and hence they are also called non-biodegradable substances.E.g. Plastic, thermocol, glass, metals, etc.
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Question 23 Marks
Thermoplastic and Thermosetting plastic:
Answer
ThermoplasticThermosetting plastic
1. The plastic that can be moulded as per our wish is called thermoplastic.1. The plastic in which a specific shape is given with the help of mould and this shape cannot be changed again on heating is called thermosetting plastic.
2. Thermoplastic substances can be recycled and reused.E.g. PVC – Polyvinyl chloride, PS – Polystyrene, PE – Polyethylene and PP – Polypropylene are types of thermoplastics.2. Thermosetting plastic cannot be reused again.E.g. Bakelite, Melamine, Polyurethane and polyster are the types of thermosetting plastics.
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Question 33 Marks
Man-made material and natural material
Answer
Man-made materialNatural material
1. The man-made materials are obtained from processes in scientific laboratory.1. Natural materials are obtained from nature.
2. Man-made materials are subjected to rigorous processing to alter the material for serving the intended purpose.2. Natural materials are subjected to less treatment and processing.
3. Man-made materials are typically much more durable having a very long lifespan.3. Natural materials have shorter lifespan, because these materials were once alive and so gradually perish over time.
4. Maintaining man-made materials require less care and attention.4. Maintaining natural materials requires lots of care and continuous attention.
5. Man-made materials can have a negative environmental impact because they are not sustainable.
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Distinguish Between. - Science STD 8 Questions - Vidyadip