Question

Assertion: Girders are given I shape.
Reason: To bear more pressure, depth is increased as per $P=h \rho g$.

• A. If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
• B. If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
• C. If the Assertion is correct but Reason is incorrect.
• D. If the Assertion is incorrect and Reason is correct.

Answer 1

Answer: (B)

The most effective method to reduce depression in a beam of given length & material is to make depth of the beam large as compared to its breadth. But on increasing the depth too much, the beam bends. To check this buckling, a compromise between breadth & depth of a beam is made by using I-shaped girder.