Which one of the following material is stiff?
Correct answer: D. All of these
- A. Al (Aluminum)
- B. Cu (Copper)
- C. Steel
- D. All of these
Explanation
The correct answer is 'All of these' because aluminium, copper, and steel all exhibit stiffness to varying degrees. However, steel is generally recognised as the stiffest among the three due to its high modulus of elasticity. Aluminium and copper are stiffer than many other materials, but they are more malleable and less stiff compared to steel. Therefore, while all the listed materials can be considered stiff, steel is the most notable for this property.
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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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