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Properties of Matter question

2023 · 24 Jan · Shift 2 · Q56
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  5. /2023 · 24 Jan · Shift 2 · Q56

Properties of Matter question

2023 · 24 Jan · Shift 2 · Q56

JEE MainPhysicsProperties of MatterMCQ+4 / −1
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Steel is used in the construction of buildings and bridges. Reason R : Steel is more elastic and its elastic limit is high. In the light of above statements, choose the most appropriate answer from the options given below
  1. A
    Both A and R are correct and R is the correct explanation of A
  2. B
    A is correct but R is not correct
  3. C
    Both A and R are correct but R is NOT the correct explanation of A
  4. D
    A is not correct but R is correct
View written solutionFree

Correct answer: A

  1. Understand the assertion

    Assertion A: Steel is used in the construction of buildings and bridges.

    This is correct. Steel is indeed widely used in buildings and bridges because it can withstand large loads and deformations within safe limits.

  2. Understand the reason

    Reason R: Steel is more elastic and its elastic limit is high.

    This is also correct.

    • In physics, a material is said to be more elastic if it has a larger Young's modulus.
    • Steel has a high Young's modulus, so for a given stress, it undergoes relatively small strain.
    • Also, its elastic limit is high, so it can bear considerable stress and still return to its original shape.

  3. Check whether R explains A

    Buildings and bridges require materials that:

    • do not deform much under load,
    • can safely bear heavy stresses,
    • return to original shape if the load is within limit.

    Steel satisfies these conditions because: High elasticity⇒small deformation under load\text{High elasticity} \Rightarrow \text{small deformation under load}High elasticity⇒small deformation under load High elastic limit⇒can sustain large stress safely\text{High elastic limit} \Rightarrow \text{can sustain large stress safely}High elastic limit⇒can sustain large stress safely

    Therefore, the reason correctly explains why steel is used in buildings and bridges.

  4. Evaluate options

    • A: Both A and R are correct and R is the correct explanation of A. ✅
    • B: A is correct but R is not correct. ❌
    • C: Both A and R are correct but R is NOT the correct explanation of A. ❌
    • D: A is not correct but R is correct. ❌

  5. Final conclusion

    The correct option is A.

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