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UPSC Civil Service Exam Questions - Engineering

Q1:

A beam of square section of side 'a' is plane in the following way :
Case I: with two sides horizontal
Case II: with a diagonal horizontal
The ratio of the section modulus of Case I that of Case II is

A 2

B
2

C

D

ANS:B -

2

Z1 for square B/2.
Z2 for square with diagonal b/√2.
Z1/Z2=√2.