You are provided with the following four materials like wood, plastic, wool, and steel. Which of the given material will you identify as hardest and softest respectively?

Wood and wool

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Plastic and steel

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Wool and steel

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Steel and wool

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Solution

The correct option is D Steel and wool
Materials that are difficult to compress are called hard and materials that are easy to compress are called soft.
Hard materials: Steel, wood, plastic, etc.
Soft materials: Wool, cotton, etc.
Here $steel >wood>plastic>wool$ [In terms of hardness]
So, steel is the hardest and wool is the softest material.

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