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Consider the following statements:
Aluminium is being increasingly used for structural purposes because
1. its modulus of elasticity is double that of steel
2. its coefficient of thermal expansion is half that of steel
3. the strength to unit weight ratio of aluminium is high
Which of these statements are correct?
  • a)
    1 and 3
  • b)
    2 and 4
  • c)
    1, 2 and 3
  • d)
    3 only
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Consider the following statements:Aluminium is being increasingly use...
Hence option D is right answer.
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Most Upvoted Answer
Consider the following statements:Aluminium is being increasingly use...
Explanation:

Aluminium is being increasingly used for structural purposes because of several advantages it offers. Let's analyze each statement to understand why they are correct.

Statement 1: Aluminium's modulus of elasticity is double that of steel.
The modulus of elasticity is a measure of a material's stiffness or ability to resist deformation. Aluminium has a modulus of elasticity of around 70 GPa, while steel typically has a modulus of elasticity of around 200 GPa. Therefore, statement 1 is correct. Aluminium has a higher modulus of elasticity than steel, which makes it a suitable choice for structural purposes.

Statement 2: Aluminium's coefficient of thermal expansion is half that of steel.
The coefficient of thermal expansion is a measure of how much a material expands or contracts with temperature changes. Aluminium has a coefficient of thermal expansion of around 23 x 10^-6/°C, while steel typically has a coefficient of thermal expansion of around 12 x 10^-6/°C. Therefore, statement 2 is incorrect. Aluminium's coefficient of thermal expansion is actually higher than that of steel, not half.

Statement 3: The strength to unit weight ratio of aluminium is high.
The strength to weight ratio is an important property for structural materials. It indicates how strong a material is relative to its weight. Aluminium has a high strength to weight ratio, meaning it is lightweight yet strong. This property makes it suitable for structural purposes where weight reduction is desired. Therefore, statement 3 is correct.

Conclusion:
From the analysis above, we can conclude that statement 1 and 3 are correct. Therefore, the correct answer is option D) 3 only.
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Consider the following statements:Aluminium is being increasingly used for structural purposes because1. its modulus of elasticity is double that of steel2. its coefficient of thermal expansion is half that of steel3. the strength to unit weight ratio of aluminium is highWhich of these statements are correct?a)1 and 3b)2 and 4c)1, 2 and 3d)3 onlyCorrect answer is option 'D'. Can you explain this answer?
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