Which one of the following are amorphous?
Correct answer: D. Charcoal
- A. Ruby stone
- B. Glass
- C. Both a & b
- D. Charcoal
Explanation
The correct answer is Charcoal. Charcoal is an amorphous solid because it does not have a well-defined crystalline structure. Glass is also an amorphous solid; however, the option indicating 'Both a & b' is incorrect because ruby stone is crystalline. Ruby stone is a crystalline form of aluminium oxide. Therefore, option C is incorrect. Option B is incorrect because it does not include charcoal, which is also amorphous.
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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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