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Consider the following statements:
Aluminum 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. It requires less maintenance
4. The strength to unit weight ratio of aluminum is high
Which of these statements are correct?
  • a)
    1 and 4
  • b)
    2 and 4
  • c)
    1, 2 and 3
  • d)
    3 and 4
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Consider the following statements:Aluminum is being increasingly used ...
Modulus of Elasticity and Strength to Weight Ratio
- Statement 1 is correct as aluminum indeed has a modulus of elasticity that is approximately double that of steel. This property makes aluminum a suitable material for structural purposes as it can withstand higher loads without deforming.
- Statement 4 is also correct as aluminum has a high strength to unit weight ratio. This means that it is lightweight but still possesses high strength, making it an excellent choice for structural applications where weight is a concern.

Coefficient of Thermal Expansion and Maintenance
- Statement 2 is not correct as the coefficient of thermal expansion of aluminum is actually higher than that of steel, not half as mentioned. This property can sometimes lead to issues in structures where temperature variations are significant.
- Statement 3 is also not entirely accurate. While aluminum does require less maintenance in terms of corrosion resistance compared to steel, it may still require maintenance due to other factors such as surface finish, potential for fatigue failure, etc.

Conclusion
- Therefore, the correct statements are 1 and 4, highlighting the superior modulus of elasticity and strength to weight ratio of aluminum compared to steel. This makes aluminum an increasingly popular choice for structural purposes in various industries.
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Consider the following statements:Aluminum 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. It requires less maintenance4. The strength to unit weight ratio of aluminum is highWhich of these statements are correct?a)1 and 4b)2 and 4c)1, 2 and 3d)3 and 4Correct answer is option 'D'. Can you explain this answer?
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