Which one of the following is tough?
Correct answer: C. Wood
- A. Stone
- B. Iron beam
- C. Wood
- D. All of these
Explanation
The correct answer is Wood. Toughness is a measure of a material's ability to absorb energy and plastically deform without fracturing. Wood is considered tough because it can absorb a significant amount of energy before breaking, making it more resistant to impact compared to stone and iron, which are more prone to brittleness and fracturing under stress. Stone, although strong under compression, is brittle and breaks easily under tensile stresses. Iron beams, while strong and durable, can also fracture under certain conditions due to their rigidity. Therefore, wood's ability to resist impact and absorb energy makes it the toughest material among the options provided.
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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